Originally Posted by hcompton
With 11:1 and a small cam its border line but a little bigger cam should work it out. Lots of ppl use 11:1 in there street cars but careful tuning will be needed.
Is the 11:1 measured or just calculated from what parts you have. The tight quench was probably done to hold back the detonation.
I use this calculator to figure compression. And dynamic compression.
United Engine & Machine Co. Incorporated
The larger quench is not ideal with alum heads and good cam it should be fine. Was the engine knocking before you took it apart?
Also what is the piston volume and type this can be very important.
Fyi: i got 10.8:1 when i ran the numbers. With 6cc pistons and 4.1/.041 gasket.
The compression was calculated by the parts it has in it. I did not fisically measure the stroke or bore. I just pulled the part #'s of the parts. The only thing I measure was the piston to deck clearance.
The motor ran fine but was only ran on a run stand. It has never been installed into a car and been driven in real world conditions.
The pistons are flat top speed pro 2 valve reliefs 5cc