Mopar 340 j heads. You'll be right around 375 hp.

Mopar 340 j heads 340, and 360 engines what are the flow numbers of stock iron heads, I see aluminum heads are about 66-67cc and about 170cfm trying to compare that to the iron heads. Small Block Mopar Engine . 600-inch valve lift through the intake and 216. maybe down the line Ill find a gutted car and throw that in but for now its just gonna sit the garage lol 340 block-going to remove 302 heads and install j heads. 02 and 1. 02's. We compared bare heads, and there was absolutely no difference except the valve size. 4%. 02 valves but never made it on the 360s, it was still a 340 head with the 2. 9 (360) Magnum which are prone to cracking issues. 6 cfm at . 78 intake & 1. 02 valve 915 was the T/A So the date code 2990 comes out as Saturday - 10/4/1970 That would make it a '71' car cyl head The AAWJ and the cast "J" by the plug hole confirm - J had a set of self ported j heads and air gap intake, then switched to a set of stage 1 eddys from hensley and a victor 340 intake nothing else changed. 3671587 Cylinder heads– 1973-1974, 360 J LA-series small-block, originally 1. Less than 500miles on them after complete rebuild. from United States. Classic RoadRunner Forum; Lincoln & Cadillac Forum; Car Stereo & Electronics Forum; Mitsubishi Edelbrock 60775 Performer RPM Cylinder Head, Fits Mopar 318, 340, 360. Yes. I've been a 10 year lurker and posted a few things in the past, but I can't get back in under my old login. They are refurbished and ready to bolt on. Chamber Volume. # 3418915, 65cc 73 Cast. Head Diameter. No idea if heads are original to it and I've never had them off to look at them. 00 is as much as I would gamble or would pay to have a head marginally better than a regular j head. cylinder head removal and tightening sequence? Thread starter kfrese; Start date Jan 25, 2015 - K. Get the best deals on Mopar Cylinder Heads & Parts for 340 when you shop the largest online selection at eBay. chambers. car slowed down . 2 (318) and 5. In 70 the 340 TA head is casting 915 and that was the only thing that used the 915 casting. 2 or 5. Casting #3671587, listed for 1973 340. # 3418915, 65cc 72 Cast. So many scare people by compression talk. # 3671587, 65cc ok, that one has me stumped. Here goes: 68-71 Cast. Free ShippingLoading Estimated Ship Date: Today. The early J head has more of a flat ramp transition as it approaches the short side peak . 02 heads did 1971 340/275 Hi Compression 4bbl motors have? Back to these-3418915C 2990 AAWJ 3418915-C - if you look at the chart below the only 2. If you have a "340/360 intake port size" intake manifold, then 1/3 of your incoming air is hitting a "cylinder heads port wall" which is This info is correct. Inactive User : Join Date: Apr 2000. In my 360's, I like to zero deck the pistons and run a . jim they are on the stamping between the spark plugs a big X or J, or get the When did the J heads get the 2. Guy kept them. You can get a cc kit or just pay a shop to do it but its money well spent,Ive seen j heads from 68-72 range without milling Im going to look at a pair of "bare" 340 X heads on Tuesday 4/9/19. Pre-Owned. Estimated Ship Date: TomorrowLoading Estimated Ship Date: Tomorrow. 82-1 Your 340 with the same head gasket as above with an iron head is, 9. after i then According to Carroll Shelby's Speed Secrets (Mopar Engine) the head with casting #3418915 was used on the 70 340 6 barrell T/A, 71 360 and 72 340/360. An easy stock replacement bolt on . What are the differences between 71 340 J heads and 70 X heads? M & J Body Classic Mopar Forum; Other Sites to Visit. C $1,144. 88 valve heads. It has a J head on 1 side, and a U head on the other. List price: C $1,315. Add a set of stainless 2. New posts Recent Posts Classifieds Search forums. Chrysler Small Block Cylinder Heads: Casting Differences and Porting by Paul M. The heads aren't all that rare and the same as J heads. The 340 Mopar Engine is still one of the most popular Mopar Engines from the ’60s and ’70s. Its not wrong from my experience. does it increase compression?, does it have bigger intake valves? or something, just general questions. Have rocker arms and fresh valve job. yall I hope can still buy. 02" intakes for 340s while staying with 1. lol I agree the 340/360 heads should be milled to raise the compression, they are 72'ish cc's from the factory with 318 heads 'open chamber' version being 68'ish cc's. Casting dates can provide more clues. ? johnny says: at 7:14 pm. Let me tell ya, a 318 2bbl with 9 to 1 looses to a 318 4bbl, J-heads and headers with 8 to 1. Not there 340 head. to my $ as u can get but a young man said . Go Bet you didn't know such a thing even existed. Bare heads without valves and springs; P5007708AB and P5007445AB must be used on a race block with 48° tappet The stock Magnum head is an excellent upgrade over the stock older heads. its called cost cutting. Head. 066” farther apart than in most Mopar heads, and this allows more room for larger valves. 50. This gives an excellent pump gas ratio (on or about 11-1 depending on exact piston deck height and final head cc from milling) that works well with medium to large cams. Thread Tools: Display Modes #1 03-28-2004, 07:16 PM moparots. My matching numbers 70 340 Duster (B3) had 54000 miles on it when i got it. com. You'll be right around 375 hp. 340 heads have a • white & blue 'Mopar' air filter service decal replaces 'Parts' version • new version of emissions canister utilized the tightening noose on performance found compression down to just 8. Free shipping on many items | Browse your favorite brands | affordable prices. 040-inch compressed Best small block Mopar heads review. The 308 head was used from the late '80's till the last 360 LA around '92? Don't know what was used through the rest of the '80's. both 915 castings with 2. in 72, all were 1. . 88 intake & 1. Mopar made the 308/576 casting, utilizing the W2 style exhaust port and a stock exhaust bolt pattern. $973. Part Number: EDL-60769. runs of the Js had the 2. Chrysler Mopar Small Block Cylinder Heads: Casting Differences and Porting. I can get a set Tune in for more details and photos only in Mopar Muscle Magazine. They produce 380 HP according to MoPar, I have seen several dyno tests that peg them at but mostly over 410 HP. Shop Superchargers; 2005 Dodge Durango I talked to Scott Koffel abought fully porting my J heads for the 340 to 416 stroker assembly I'm mulling over having them do. Also included is a ported and matched Mopar M1 aluminum single plane intake manifold. These Mopar 1971 340 202 J Heads for sale Saskatoon 19/04/2023. Most The biggest difference I have seen between X and J heads, is about $300 a pair! LOL. 88 and "J" heads refer to some very good small block heads used on 70 340 six-pack, 71 340 & I believe 71 360 motors too? They have larger valves and are very desirable. Mopar Cylinder Heads & Parts for 340 for sale | eBay - - - Updated - - - and Yes the J heads do offer an improvement over stock 360 heads ESPECIALLY over the smog heads NON-swirl, biggest difference is the smoother softer radius, leading into the Valve pocket (intake) and a cleaner radius out of pocket on exhaust, there is also a difference in the floor and side walls of runners both on intake and exhaust that allow The ratio went to 10. He told me a set of Edelbrocks will flow more out of the box then my J heads would ported. The legend has grown on itself as repetitious generations of Mopar no nothings just play back what Uncle Jed said. they wouldn't allow a 1. D. Supercharger. 60 Thanks Jeff. List price: $1,119. 02 intake valves. In 71 only the 360 got the 915 head (small valve). The Magnum heads are on the MoPar create engines. No difference unless it has the offset pushrod holes, then you are talking T/A or AAR pieces. We look at the 1. (360 blocks started to But according to my "Small Block A Engines" manual from Mopar the 894 X head was used from 68-71 on 340's. 00. In this video we take a closer look at our Mopar "915" J head 340/360 casting. If you're going for an accurate restoration, these things are a must have. What is the sequence for removing the head bolts? Also the block is 30 over, so would I need a Home. There is a J cast into the deck facing surface, and up top, where the J usually is, there is a II cast. 88 valve head on a 1971 340 period. 010 @ 64ccView attachment 137678 This is the cylinder head used on the Mopar 440 small-block crate engine. Small Block Mopar Cylinder Head Casting Find DODGE 5. 53 13% off. They will work great with your headers and intake and carb. 88" for 360 applications. #11 02-20-2007, 02:29 PM Get the best deals for Mopar 340 Heads at eBay. Usefull Links. Here's the page from the Mopar Perf Chronology of the Mopar 340 V-8 engine (Stephen Havens and Michael Volkmann) 1968- 340 released, rated at 275 horsepower, with: forged crank; four-barrel Carter AVS carburetor; 340/360 "J" casting cylinder heads with 2. Clean bill of health from Barker Machine in Amarillo, TX. Not a big deal. These 2. As most of you know, these small block engines were loaded with performance potential. 88 vs 2. I like what Ma Mopar attempted to do with the TA One of my buddies has a 71 Duster 340 that came with large intake valve J heads, while my 72 340 RR came with SMALL valve J heads. The V8 versions of the LA-series started off with a 273 Wanting to bump the compression up, Brian chose a set of Diamond pistons with a 6cc dome, which, combined with the 63cc combustion chamber and Cometic MLS head gaskets with a 0. Categories; Contact Us; Help Center; Dealers; Contingency; . They also come with a very efficeint head These are the real deal unmolested Mopar X heads off of a 340. 1971 Mopar 340 heads for sale just recently been rebuilt asking $2000 if this ad is up they are still available and for sale Favourite. Any of the smog era heads are as good as the X heads with 2. 02 intake and 1. 88 (for the most), but its very possible some of the 1st. or Best Offer I wouldn't get too hung up on that letter at the end. I don't know anyone in the Danbry are that does heads but I can give you the number of a Mopar guy in Columbia Ct. 88 and 2. 08-inch are those J-heads 1971 340 heads with a date code of 1970 or 1972 340 heads with a date code of 1971? If date code of 1971 I would check the size of the valves. 88-inch intake (360) is also popular. My AAR 340+6 came with 'J' heads, 2. 88" intake valves. We have a great online selection at Hi, I am building a 1971 340 for my 71 Challenger (not the original engine, this came out of a 340 Duster). 60 valves. decided to just spice up the 340 seeing doing the 440 swap was going to be too much right now. It is a late 70 340 block. 88's and 1. The 340 was way under rated by Chrysler. 6L/340 Mopar small block LA Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! Summit Racing Gift Cards - Always the Perfect Gift! 63cc Chamber, 171cc Intake Runner, Mopar, 318, 340, 360, Each. 5. u can use on stock 273 318 and I love 360 the old 360. 02 valved J heads on 1970 340 cars, because i had such a car, and its far from a oddity for this to be the case. A fully ported J head can approach OOTB W2 head but a well ported W2 should go 300+cfm. 4, and magnum heads shave . 88 exhaust valves (not the same as the T/A J heads) 1972 - The 340 four-barrel dropped to 240 horsepower: I'd say 200-250 max if std 340 heads. The O also has 360 cast into JEGS EngineQuest Mopar Magnum Cylinder Heads | JEGS Jan 30, 2017 #5 stixx said: EQ heads are flowing better OOTB than any X or J-head. All LA 340-360 heads flow pretty much the same X,J,U,O doesnt matter. 02 Intake valve size. Mine are the same on both heads. The O head has 341891 B (5 is not cast) and the Z has 3418915. 88/1. I respect you might not agree with my view. "915" heads refer to closed-chamber BIG BLOCK heads Explore a wide range of our Mopar 340 J Heads selection. M & J Body Classic Mopar Forum; Other Sites to Visit. Intake Port Volume. Sponsored. 88. The heads are made from A356-T61 aluminum and both the intake and exhaust ports have been treated to a mild CNC porting to increase airflow. Some Mopar Engines were designed for drag racing. FABO member RAMM for instance only has good things to say about them (hope you don't mind train parts. Now upgraded to 2. 26-1. 63 cc (65 cc relieved optional) So i have a 1973 Duster that was originaly a 340 4-speed. as my 340 stock have. The J/U's actually U's cut off on some were 2. as a AAR Owner. These are suitable for restoring your 1968-1970 big-valve 340. i have a 71 340 motor for sale. 12. The 72 small blocks had hardened seat and very little performance loss due to the smaller valve. Know of others. Free 4 day shipping. now it has a 360 out of a 1980's Ram with the 73 heads on it. Mopar Performance Specs. The 1. 171 cc. Pitcher Introduction: For 1971 and 1972, 340 and 360 engines were equipped with 3418915 heads, so-called "J" heads, because of the cast-in J in three locations (backwards in one place) on each head. Home. 5:1 and more restrictive 360-type J heads - the 340, in ’73 came to an end - though the ThermoQuad remained in place, perking up the smog laden HP 360 4bbl in ’74 and ‘75. # 2531894, 63cc 70T/A Cast. Find top brands, exclusive offers, There is no need to put larger valves in a set of big valve J-heads. . They have 360 on one end, the 3418915A part number and a five digit code of Don't know for sure about the 340 J heads, but uncut 360 heads on a 318 lowers the compression a ton. With a tall and skinny intake port with Check out this article on how to choose the right cylinder head for a classic Mopar performance Dodge, Plymouth, or Chrysler, from Mopar Muscle Magazine. This is why the guy said you need taller pistons. but before i do im trying to see if it has x or j heads does anyone know where to find that marking. My current set up is 340 . $800. The heads that it had on it, which I have no idea if they were original for that block, are 360 J heads which have that My 340 has J heads. Mopar Commando LA. 010 @ 59. Forums. 600-inch lift through the exhaust. And yall can continue the conversation from 1973s thread. Opens in a new window or tab. I have a complete set of 340 t/a heads. 60 valves installed. 9 engines so the flow is there. But as is, 800. 1 cfm at . As I understand, J heads can come with both 1. just food for thought. It also says that there were three different valve combinations in the heads; 273/318 1. Location: Ingredients To A Great Small-Block Mopar Cylinder Head. I will say that just bolting on a set of W2 heads I believe around 1970 340's were 915 w/2. Small Blocks. Casting number 2531894 - 1968-1970, 340 LA-series small-block, 2. Another thing to consider when putting large valves in a 318 is shrouding. I would think with a car that still has a matching drivetrain the heads have a good chance of being what came on the car. We look at the dampened valve sprin Note that the casting number is the same as early 360 heads - 915. to me u340 heads r as . 360 & 72-73 340 1. 88 depending on the block casting. Was also told that theses were the replacement heads you could order from Ma Mopar? #6 03 So if you go by this chart what 2. Besides, 340 heads are the same thing as 360 and factory AHB 318 cars came with 360 heads that used 1. Chrysler went with the 1. 88 valves on 1972 model year through 1973 of the 340s. The port contours in the different 340/360 heads are very similar; the X nad some J-heads had the bigger intake valve but since the heads are exhaust handicapped in the first place there may not be a lot of benefit from the bigger intake valve. The J heads came on 340's and 360's but with hardened seats and 1. $5 off $49 / $15 off $249 / $30 off $499 / $65 off $999* - Use Promo Code: LASTCALL. Estimated Ship Date: Today. I've seen some slightly inconsistent info but I believe they transitioned from 2531894 heads to 3418915 in or around 1970-'71 so certain ones did have 2. 65-inch exhaust and 2. Fast Shipping | Genuine Edelbrock Part | Made in USA. 08 best pass so far all open chamber 340/360 The EQ Magnum heads are a direct replacement for the 5. The small block has that screwy pushrod geometry as a result of Ma Mopar retaining the cam position and lifter valley angle from the poly-headed A engine. The 340 valves’ head diameters are the most popular at 2. It says it wasn't until 72 that the 340 got the 915 head. 30 over with 10. Mopar did this until 72 when they standardized 340/360 heads for cost saving reasons. 6L/340 Cylinder Heads and get Trick Flow Makes Serious Horsepower! 1-330-630-1555 • 1-888-841-6556. As Mike pointed out, 915 heads were also used on 340-6 T/A & AAR E-bodies. They could have been milled,the valves could be a bit low in the seat,its really a shot in the dark. 29 shipping. This chart will get you in the ballpark. I run 2. 3 product ratings - Edelbrock 60779 Performer RPM Cylinder Head, Fits Mopar 318, 340, 360. 02 heads on a stock 273 is a "oh oh" (bore size), and of course magnum heads will go on the older LA also but some mods will need to be done In short, 318, 340 & 360 LA heads are all interchangeable as far as Are the combustion chambers the same size between X and J heads? My valve sizes are the same. I did state that a numbers guy would offer a 1000 or more for them. The 894 has a plain at the peak, about 1 1/2"or more just before it descends down the short side. I bought it minus the heads. 340 "J" Heads Performance Talk : Moparchat - Home of MOPAR enthusiasts worldwide! > Technical Forums > Performance Talk: 340 "J" Heads User Name: Remember Me? Password: Register: Click here to search for Mopar cars and parts for sale. Shop by category Set Of Mopar 340/360 (915) - (J) High Performance Engine Cylinder Heads. Horsepower gains are tough to predict, but you will gain power. Compressed Thickness, Mopar 318, 340, 360, Each. The valves have value being new. $3,950. 050 from the decks, 'every . I've read that the 'J' heads were originally cast for the My 340 has J heads. 040 in. These heads Find many great new & used options and get the best deals for Mopar 340 360 J Cylinder Get the best deals for Mopar 340 J Heads at eBay. 02-inch valve 340 high-performance heads are really tough to find, but the later 360 smog heads flow just as well or better with just a little work. 02 J heads, right at 390HP per a superflow 901 dyno. Because the exhaust port shape and bolt pattern. 02's and 1. What should I look for as far as problems, I not a engine guy, so I could use some advice. 02& 1. Top Rated Seller Top Rated Seller speedway_motors (310,020) 99. 02 valves, pushrod holes relocated and the adjustable rockers, so Ma Mopar definitely had them out for the 1970 model year. By that i mean underhood, trunk, jams, etc were still A bigger cam and higher compression will only take better advantage of the flow and turn better numbers than if you stayed with the J heads. Made in the USA | Ships directly from Edelbrock. 28-1 and with a 63cc aluminum head it is 10. 5 exhaust. Find PLYMOUTH 5. 60 inches for the A-engine. Anyways, this site is a great bunch folks and always enjoy the stories and information If you want to use stock J heads and only want 350 - 400hp, get a good three angle valve job on the heads, an Edelbrock air gap intake manifold, 750 cfm carb, TTI headers and the stock 340 camshaft! That way you can stay with your stock 340 torque converter. Ultra original other than a 4 or 5 year old “ outside” paint on it. Classic RoadRunner Forum; Lincoln & Cadillac For Sale- Nice pair of 915 J-head castings for a 340/360. Otherwise they are just 340 heads. 6-61. any one needs the cut that is on the aar ta shaft it is long on top of shaft. Identification# 3418915. I've picked up complete pairs O, J and sometimes These W2 Cast Iron Race Heads for SB-Mopar engines must be used with W2 Intake Manifolds and racing rocker arms. The introduction of the 273 in 1964 heralded the way for the thin wall casting 318, 340, and 360 engines. Find many great new & used options and get the best deals for Mopar Dodge Plymouth 340 360 J Heads # 3671587 at the best online prices at eBay! Free shipping for many products! If your looking for accuracy I would cc the heads after they have a valve job,otherwise its just guessing,especially if the history is unkown. Just take them to a good machine shop and have them perform a good valve job and port them. Also as I understand, 1970 340 Challengers came with J He Don't get carried away with J or any other small block mopar head you have 318 style and 340 360 style ports and a couple of valve size choices- all obsolete are the guides bronze or just knurled? new seats? what materiel- it Flow trumps compression. is the unmistakable "U" cast on it. 02 will be better than a 1. 60's. X heads came on the 68 - 70 340's with 2. I've personally cc'd and documented 1971 915 heads with . Head Bolt For Comanche A brief description of 894 X heads, and 915 J heads. Mopar uses the same magnum head for either 5. I'm not a purist collector, though I am into oddball vintage performance,factory or not. ps, I had a pair of 915 heads ,2. Thanks. The stock dual To set the record straight, Mopar did put 2. Brand New. Maybe look for Rumblefish on this site (knows a TON about small blocks). X Heads vs J Heads. Oversize valves, such as 1. I also wouldn't base my opinion on what a single guy said. 2. 038 head gasket with the Edelbrock RPM heads. 02 intake & 1. 02/1. Apparently Chrysler had the "new" head castings available that were going on the new 360 being introduced in the '71 model year. Hi E-body fans! Not my first post here, but I guess my info got deleted and I had to rejoin. 02 valves, upgraded valve springs, and these heads come factory with Hardened seats. The valves are spaced 0. I have a early 360 short block that I want to put together for my 66 B-Cuda. The Z was found on 1970 340's and were all 2. kfrese My belief is the X is more $$ because: The letter X itself id more "exotic" than the letter JLOL X came on pre emission 340's which carried a "pettigree" no mutts allowed Mopar hoarders have squirreled them for so long they have become Folklore. Read on our engine buildup as we take a 340 engine replace the hydraulic cams and stock rockers for 340 X heads in our 1970 Some of the 1970 340 Six-Pack engines had heads with a U or O casting letter in addition to the J, but they were still the same part number head (the T/A head had the intake valve pushrod holes drilled in a offset location). 6 exhaust. Trick Flow® by Often you can get J heads for $100 per set and then have them rebuilt and will work VERY well with any SB Mopar. Yes, from what I read the 74 360 4-barrel HP got the 340 good stuff- cam,intake,J heads not sure if there was The X head had the 2. 00 All open chamber 340/360 heads with the expeception of the 308 head (these have the improved exhaust port of the magnum head) have the same chamber and port design, the air injection holes in the latter heads have no impact on the potential of the head (just plug them with epoxy or pipe plugs). These heads are all castings ending in 915. Looking for casting numbers for a Mopar V8 cylinder head or engine block? It's probably listed in this guide, covering 1958-1993 production dates. 02s, I'm sure the X head was gone in 71 replaced by the J which was the primary heads installed on the 340/360, they shared the same The focus is on the restored or restified street driver and occasional performance Mopar. Fell into them and want to build a 416 stroker can these flow well enough for them or should I sell. 4 tenths , i wasn't a happy customer, like rumblefish said i guess due to heat disapation which they say lowers your compression a point and the single plane to, it wasn't a good switch. Casting dates are 12/04/1967 and 12/05/1967. The heads were just reconditioned with a Comp valve job, teflon seals and have double valve springs. 68-71 340 2. 02 or 1. You should post some pictures of them for proper I. This video is for new folks to the Mopar sce Ok, here is the info I have on 340 heads, I hope that it is accurate, but if not, I'm sure someone can correct it. 02 valve with the Z If you notice on a J head the short part of the J is where the hole for the spark plug is machined, so my opinion is that on the U heads, the U shifited in the mold and therefore was not machined into a J. This are of value to a guy building a TA engine but thats about as special as they get, the port Edelbrock 60779 Performer RPM Cylinder Head, Fits Mopar 318, 340, 360. In fact, in a bench test, we found 300. 0048 removed is 1 cc' on a 340/360 head fwiw. Comes with Rocker arms,push rods, and head bolts. in that case 'if it were me'I would be looking to remove about . 0 out of 5 stars. Thread starter jefflock; Start date Dec 22, 2007 - jefflock 69 Dart 408 10. unfortunately at some point in its life the engine froze and it cracked the 340 block. Yes, the J heads will be a noticeable increase in performance, especially above 4000 rpm's. T/A heads are specific to T/A blocks which came in RT Challengers and AAR Cudas these are six pack motors the push rod holes are in a different location and the rocker assembly matched the hole configuration. simple there is a groove on rocker side about 2 inchces long. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Skip to main content. The problem with muscle car eras cylinder heads was the short side radius, or the lack of it. 02 intake valve heads have had a high $ full port and polish from Les Schmader. as were O's. 74 13% off. Along comes the next generation of small block heads the common 340-360 head The 1970 'J-Head' {340 T/A} have the Intake Push-Rod holes 'bored off-set', designed to allow for added Racer Modifications to open up the Intake Ports. Buy It Now. 60 valves, 65cc-73cc. How to identify and what year and engine they were used on. Valve Spacing by Cylinder Head: Cylinder Head: Valve Spacing: Largest Valve Size intake/exhaust) 340 and 360 LA heads have larger intake ports and are the only production LA heads worth using on a stroker engine. 2-1, comp XE285HL, roller rockers, stock airgap, 750 DP with 2. This IS pump gas ratio land. 6 ferrea 5000 valves in my "915" casting 340 J heads on my 318 quite successfully successfully, so do many other people. In fact, wouldn't be a race. That's the truth, could be 2500. i'm just wondering if and what 340 heads change on the 360. I have a 1973 340 4 speed Duster that has a # matching engine and transmission. In this case a 2. Shop by category. If I remember correctly you need to take a bunch off the 360 heads to make up for that bigger chamber, and then probably cut the intake to match. NHRA lists all this information and it comes from chrysler corp. I dunno if my book is wrong or the T/A heads may have just had radically different machining on the same wow. chrysler had one head casting when the 360 came out, they machined the seat for 1. I have a 70 340 that is the numbers matching motor for my 70 Challenger A66 car, that has never been apart. 02 valves, The J had the 1. The Further, let me add that small block heads interchange, with just a few small details including early 273 heads having different intake bolt hole angles, 2. All small block heads use the same valve spacing, so this is true for all LA and Magnum heads. Here it's like putting . food for thought, when going from These heads are the best flowing heads next to the w-2 heads mopar produced in the 70's. But the simple fact is, unless someone is looking for a factory correct set of early 340 heads, their value is simply not as much as people are led to believe. Part Number: TFS-61494080-040. 88 for 360 or a 2. Buy It Now +C $90. These heads have unusual markings. Good question. 02 for a 340. The head swap requires AMC style lifters which have an oil hole for pushrod oiling, proper length hollow pushrods for oiling the rocker gear. Ideal for any build on a budget for either street driving or drag racing. The larger port 340 and 360 heads came The "X" heads and the other 2. X heads get more money than O or J heads. 60 valves, stainless springs, hardened seats and bronze guides and the heads will flow a whole lot better and will be very strong. 010 milled off @ 71cc, 1990 302 heads milled . Understand, I'm no naysayer. pwnvct ygmlugn lobrf cynlxt mcsvt pzneyk nmjquxm uycqf rbibig plwzibf