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Original Message
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| RE:now back to Earl's quesiton.. |
| By Mike McQuesten - 01/05/2002 1:36:23 PM; IP 63.50.108.188 |
Yes Earl, from what I can see, the only difference between the C3AE-C 406 head and the '63 390 head is the exhaust valve and the spring cups.
This has lead to quite an interesting thread on rated/published and real combustion chamber volume. I do remember the discussion quite a few months ago. The one I remember was in August when I posted about a friend finding two sets of C3AE-C heads at a local rebuilder shop. We were pretty punped to pick the two sets up reasonably priced. So I asked some similar questions to yours Earl. In summary I was informed to not get too excited about the standard '63 head.
My friend cc'd his set. He came up with 66, maybe 64? It was either 64 or 66. This was with standard 390 valves and not a new valve job.
If you just eyeball the combustion chambers of the C3AE-C right next to either a C1 or C4AE, it seems very obvious that the C3-C is going to offer a much higher combustion ratio. They are indeed a unique chamber.
Which would lead me to ask why the rated compression ratio of the '63 390-4V jumped to 10.5:1 vs. the 9.5:1 of the '61/'62 390-4V? Same dished pistons remember.
As always, just lookin' to learn. |
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This thread, so far...
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