i bought an aluminum block from slicknick and am going on with a stock bottom en rebuild with big cam maybe around the t-rex model.i am using 5.3 truck heads that have had the minor bowl blending and chamber polish.i know cheap but effective.engine is going to have msd and edelbrock carb intake.will compression be too much for stock pistons?is there a thicker head gasket i could use?

 

You might need to flycut those pistons.
Compression will be fine on 91 or better fuel.

 

yes put a thicker head gasket on it will lower compression

 

if you didn't get those head ported, you are hurting you power since the 5.3s unported flow like crap.
No the compression will be fine with stock gasket.
You'll need to measure PTV if using T-rex.

 

well,they are home ported.i know,flame me but i am pretty good and have had great results.besides,if i ruin a set of heads the truck heads are the ticket.they are bowl blended,chambers and exhaust are mirror polished.ANYBODY HAVE A PART # FOR THICKER GASKET?

 

By The Way,i Have Access To 93 Octane Where I Live.

 

Maybe your not understanding us when we are telling you compression is fine.
There is no need to lower compression or run a thicker head gasket.

 

reason i am paranoid is that my combo will run a carb.

 

my buddy runs a carb and has ported 5.3 heads on a stock bottom end and he didnt use a thicker head gasket or fly cut and his car runs great!!