Thread: CC'd some heads
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Old 09-12-2017, 01:27 AM
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Shiny Shiny is offline
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Join Date: Nov 2008
Location: Windsor CO
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Quote:
Originally Posted by F ROCK View Post
1970 #11, small valves, pressed in studs, 90cc
Ugh

Quote:
Originally Posted by 77 TRASHCAN View Post
I calculated the compression ratio on my 1970 350 using 6 cc's dish for reliefs, .020 in hole with the 90 cc chambers, got 7.74:1. A long way from the 8.8:1 factory advertised...LOL no wonder I could run 44 degrees total timing and NOT make the thing ping. Has a 066 cam in it...
Yes, that does position the factory claim one notch below folklore.