I was thinking of getting some Dart Iron Eagle 200's with 64cc chambers and using a XE268 on my 0.04 over 350. I have four valve reliefs per piston. Will the dynamic cranking compression ratio for this setup be too great for pump gas on the street. Is this cam the best choice? What would be a better cam?

 

what pistons? flat tops or dished? at any rate i'd guess you'd be fine but there is a lot of varances even with the same compression ratios depending on piston design among other things.

 

With 4 reliefs I would assume flattops...I would guess 9.5-10.0:1
I've seen production Vette's with 10.8:1, but you'll need the good stuff.

My '94 is about 10.5:1, and requires (well tells you) to run premium.

Ron

 

Yes they are flat-tops with 4 valve reliefs. What is the average piston in the hole distance?

Thanks

 

Piston to deck height is usually .025 to .045" on a undecked block
with typical factory and replacement "flat tops"
The only way to tell is to actually measure your assembled short block. You can juggle the final cr with different thickness head gaskets.
At any rate your dynamic cr and mechanical cr will not be exessive with 64 cc heads.