What type of compression would a LQ4 be getting with 5.3L heads?

 

Nobody?

 

I believe 5.3 heads on a LQ4 hits around 10.4:1 with a stock gasket. With a .040 gasket you can get about 10.7:1. I think the 6.0 heads flow better, but maybe with the extra compresssion from the 5.3 heads you could pick up a few horsepower. I'm sure if you search there will be more info on this.

 

how about a lq4 with stock heads and stock gaskets milled .015?