i dont think what John is saying is the correct way to say it. but what he means is, 14:1 dynamic compression. "11:1" doesnt mean anything other then the measurements of the components installed. Now how alll those components interact is another story. meaning is the cam big enough to bleed off the added cylinder pressure created from the bore increase alone. so 11:1 would be around 200-225 psi. my car as an example was supposed to be only 11.8:1. I had over 280PSI in each COLD cylinder. 93 octane is JUST about enough to keep the heat out of the motor. With some funky timing tables and cold start tuning it starts and runs. but with out EFI it have to run 100+ octane. Or a new cam. so measure compression. that might be why engine builder sez a MEASLY 12* timing at idle.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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