Photo of Combustion Chamber of Head Casting 2843675?

Treblig said

The 69 318 came with 68/69 CC heads, open chamber....that's if they are the stock heads??? The 69 318 is also the highest compression 318 that Mopar made.

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I would say that the 67 318 has the highest compression, it has the four eyebrow pistons and the closed chamber head...

In 68 and 69 the 318 had the open chamber heads which added about 4 - 6 cc's...

dibbons said

My 318 (1979 block casting) was rebuilt 10 years ago and runs great. I have no idea what the combustion chambers look like in the cylinder heads she uses. I know the valve size must be 1.78"/1.50" but curious about the combustion chambers.

If anyone has a similar head casting laying around, I would appreciate seeing the posting of a photo of the combustion chamber. Thank you.

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dibbons said

Thanks, it's hard to tell combustion shape from that greasy photo. If anyone has a better photo of a cleaned up 675 head, I would appreciate it. Or a close-up of a single combustion chamber maybe?

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Here's a set of 675 heads that I had my head guy port and install 1.88" intakes and 1.60" exhaust valves in, I believe they are 69 cc (not for sure):










Here's the 920 closed chamber head with the same treatment, porting with 1.88" intakes and 1.60" exhaust valves... These cc'ed at 63 cc... (that's a for sure measurement - I measured them myself...)












There's some info about this in my old thread on trying to bump up the compression on my 318:

How Much Can Heads Improve Compression???