I built a 383 replaced solid z-70 dur-304 cam lift 365 valve lift 548. dur-@50 264   for roller went with comp 12-908-9 changed all springs retainers lifters ect.heads are iron eagle 205/164  have not checked vacume yet what should I have?  

What's your static comp. ratio? What are the specs. on the roller cam?  

roller specs are gross valve lift int-630 ex-630, tappet lift int-300 ex-308, timing open int-44 ex-80 closed 76 48 dur-@ 50 int- 264 ex-270 lobe separation 106. how do I find static comp ratio? thank you  

If I did this right I  came up with 16.72 with thickness of gasket. without gasket it is .000 decked and is 18.65, does this sound right? new at this any help greatly appreciated thank you  

any help appreciated  

All the volumes mentioned have to be converted to cc's. Comp. ratio = Combustion chamber volume, - piston dome volume, or + piston dish volume ( you did not specify what you had ), + head gasket volume, + deck height volume, you stated zero deck height, so that figure is zero. + swept volume ( cylinder displacement in cc's ). Divide this figure by, combustion chamber volume, - or + piston dome, or dish volume, + head gasket volume, + deck height volume. This will give you your static comp. ratio. When you come up with the figure, post it and I will give you the "theoretical" cam choice.  

on a static compression calculator Icame up with 18.65 thank you jw454