X-heads vs J-heads: what's the difference?? - For A Bodies Only Mopar Forum
2014年1月8日 · I would say probably about 100 for J heads with 1.88 valves and maybe 200-250 for the X heads, maybe a hundred more if they are ready to bolt on and go. People think they are worth their weight in gold.
What are "J" heads | For B Bodies Only Classic Mopar Forum
2015年3月4日 · The other letter heads "O", "U" , & "J" are standard pushrod holes heads . These heads are NOt high performance heads but just sime dead stock heads. They have a flow rate of approx 200/210 cfm.
Porting small block 915 j-heads - For A Bodies Only Mopar Forum
2020年5月1日 · I’ve ground thru the short turn on two SBM heads. One was a J head that was already ported, that I was trying to tweak for the customer. It was a small hole and I repaired it. I had based what I was trying to do with it on what I had found working well on a core head I …
J Heads on a 1970 Challenger 340? Who can solve a mystery?
2018年9月23日 · My 340 has J heads. As I understand, J heads can come with both 1.88 and 2.02 intake valves. Also as I understand, 1970 340 Challengers came with J Heads. My Challenger was produced in November of '69. Marking on my heads are 3418915. So you can probably assume that I have the 2.02 valves, right? Here's the mystery: they are blue.
Difference in X heads & J heads - For A Bodies Only Mopar Forum
2017年12月28日 · X (894) head ports are said to flow a bit better. But the difference is minimal. Considering how the much sought after, old, worn and remachined 894 heads are over the years, machining a fresh 2.02" intake seat in a 1.88 J (915) or newer 360 head will provide as good or …
How to Build Mopar Engines for Performance: Cylinder Heads
2017年5月1日 · For very high compression ratios and racing applications, Mopar/Chrysler introduced blocks and heads that featured six bolts around each chamber (18 bolts per head). Cometic, Fel-Pro, and others offer special six-bolt head gaskets for this application.
71 RT 340 with J heads???? - For E Bodies Only Mopar Forum
2020年1月30日 · My AAR 340+6 came with 'J' heads, 2.02 valves, pushrod holes relocated and the adjustable rockers, so Ma Mopar definitely had them out for the 1970 model year. I've read that the 'J' heads were originally cast for the upcoming 360 engine, and it was a toss up which the '70 340s came with.
"J" heads advantage? | For B Bodies Only Classic Mopar Forum
2014年3月22日 · I found a pr of small block J heads for sale and I'm wondering if there's any performance to be gained over my stock '76 360 heads. For the price ($200/pr) I'm assuming stock 1.88" intake valves, although the ad does say they've been ported.
"J" and "X" heads, whats the difference? - Moparchat - Home of MOPAR …
2000年3月30日 · After pulling the motor from my drag car I found a crack between the valves. My machine shop said it could not be fixed. The heads are "X" casting. My friend has a set of "J" heads with 2.02" intake valves just like my "X" heads.
Small Block Cylinder Heads 'Stock Specs' - For A Bodies Only Mopar Forum
2013年9月6日 · The factory 2.02 j heads I have tested flow 228cfm intake and 142-147cfm exh. The factory 2.02 j heads also have an exact 72 cc chamber. The port volume increases from 160 to 165 with a 1.88 int valve due to the back side of the valve head having less tulip to it.
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