Hey I have 9.0:1 comp with 76cc heads right now what would it be if I went to a 64cc heads...I am on a tight budget and the pro lightning heads are cheap and all but the vortecs fit my budget better....

 

Can't do the math with just that information, but it'll be in the 10.0-10.2 range.

 

if I was easy on the timing do you think it would run on 93 octane for the street..

 

I think 10:1 or so is streetable. Do a search, im sure this has been brought up before.

If it were me, 10.5:1 for cast iron, maybe 11:1 for aluminim is the maximum i would run for compression with 93 octane.

Im goig to be running a larger cam however that will be keeping that compression in check.

 

i was thinking about using the comp cam 274* extreme energy cam..

 

the XE274 is a very strong cam. There are several members who run that cam with no problems. Its a milder cam than the one im using. You should be fine.

 

You'll be fine on compression. The vortecs will be a nice upgrade.