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I have a 66SS396. the block is origional, the heads are off a 69 chevelle and is closed chamber with rectangular ports. The block has been decked, shaved, or whatever you want to call it, it has been bored .030 over, and it has pistons with a slight dome to them, a little more than stock. Now, I cant find matching piston numbers on the net, so I cant give the specs. My question is, what should my compression be, and how do I calculate it? I was told that with a stock compression ratio of 10.5 to 1, plus the mods, I should be pushing between 11.5 and 12.5. these numbers seem a little on the high side thou, but I wouldnt be suprised. I am doubting it being that high, because it runs fine on 91-93 octane, but any lower, and it starts running real bad. any suggestions??
oops, dont u hate typo's?


[This message has been edited by Airborn Fox (edited 12-05-2001).]
 

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<BLOCKQUOTE>quote:</font><HR>Originally posted by Midnight Marauder:
Try this link. Plug in the numbers. Gotta scroll down for comp. ratio calc.
http://www.prestage.com/carmath/
<HR></BLOCKQUOTE>


Suggestions would be, run the 92 all the time. either that or adjust the timing when running the lower octane fuel.
 
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