just curious. what would the compression ratio be on a stock bottom end 5.3 if i had the stock 706 heads milled .050 and used a stock head gasket? i read the sticky but i suck at math. lol! any information would be greatly appreciated.

 

is .050 to much?

 

You should pm fastrt he milled a set of heads .050 and thinner head gaskets to get his compression up.

 

I'm guessing around 10.3-10.6:1

 

Basically, with a .050 mill, you are removing 7.14cc's. So, stock 706 casting is 61.15 - 7.14 cc = 54.01cc's. Thus moving your compression from 9.5:1 to roughly (with the same head gasket) to 10.2:1. You would have to use a compression calculator to confirm with the piston cc's, deck clearance, gasket thickness, etc.

 

thanks for the help guys.

 

i milled my heads .050 youll be fine and as far as compression 10.6: sound good the only thing you will have to change will be the pushrods maybe 7.350
or smaller

 

i had my 706s milled .35 and used stock GM head gaskets and it does good. just needed 7.350 pushrods.

 

thanks i was planning on some new pushrods.but i am curious how much camshaft i can run with out running into ptv clearance issues? i would like try a tsp224 or maybe one of the new lsr lobe cams. any insight would be appreciated

 

I would think you would be ok with a mid to upper 220's cam without any clearance issues. I have done a 5.3 w stock heads milled .045 on stock gaskets run a 226/226 with no probs at all.