J Heads?

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Originally Posted by sireland67

I picked a set of "J" heads off a 1971 360 on an old cop car sitting in the junkyard back about 1982 and it had .202 intake valves.
The motor had so much grease on it, I would bet it never was apart.
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THIS is why i was asking. i used a set of J heads off an early 71 360 on my last 360 build and i didnt even bother to check what size intake valves were in it "assuming" that all j heads were 1.88
 
73AbodEE said:
THIS is why i was asking. i used a set of J heads off an early 71 360 on my last 360 build and i didnt even bother to check what size intake valves were in it "assuming" that all j heads were 1.88
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360s never came with 2.02s. In a round about way on the other thread, that's what I was tryin to say.
 
Some 340s had J heads with 2.02 valves.
 
mine got 2.02 valves when I took them to the machine shop and ask if they could open them up for a set of 2.02 valves

The "X" heads came with 2.02

as far as I know "J" heads came with 1.88
 
Just to restart......I thought a 71' 360's which were 2bbl's were "J"s with 1.88's and all 71' 340's were "J"s with 2.02's. So that's where i'm at, let the discussion continue. :D
 
It appears that maybe some J heads came with 2.02s. The 360 never had 2.02s, but they did have 1.88 J heads beginning in 71. Does that help?
 
73AbodEE said:
great . good to know, i had heard before that some 360 j heads came with a 2.02
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That's a big negative. Because if they ever had, the 340 might notta been the performance engine.
 
Like I posted in the other thread. The J head replaced the X head as a running change in mid 70 model year. Tjese heads had 360 cast on the ports also. They had 2.02" intake valves. The reason they had the 360 on the ports is that the 360 was just coming out and the changes to the head were charged off to the 360 program.

In 72 they went down to the 1.88" intake valves. However any good head/valve guy can open them up to accept the 2.02 valves and they will be as good as the early 2.02" J heads.
 
StrokerScamp said:
That's a big negative. Because if they ever had, the 340 might notta been the performance engine.
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not to get off topic , but ive always found it entertaining to hear how the 360 replaced the 340 :D

which it eventually did, but they were both being manufactured at the same time
 
krazykuda said:
Like I posted in the other thread. The J head replaced the X head as a running change in mid 70 model year. Tjese heads had 360 cast on the ports also. They had 2.02" intake valves. The reason they had the 360 on the ports is that the 360 was just coming out and the changes to the head were charged off to the 360 program.

In 72 they went down to the 1.88" intake valves. However any good head/valve guy can open them up to accept the 2.02 valves and they will be as good as the early 2.02" J heads.
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That makes sense. Still though......the 360 never had the 2.02s. But plenty of 340s had to have 2.02 heads with "360" cast into them.
 
73AbodEE said:
not to get off topic , but ive always found it entertaining to hear how the 360 replaced the 340 :D
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I tell you brother......had Chrysler EVER put 2.02 heads and 2 eyebrow flat tops in the 360, the 340 wouldda been done for.
 
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