Hey yall. Got a question. I have a 348 that has forged pistons, 242/246 cam with 621/614 lift. It also has TSP's stage 2.5 5.3 heads that were milled .040. So, with all bolt ons, the stock motor with ls6 intake, said cam and said heads made 454rwp. We pulled the block and did said work to the block and pistions. Put all bolt ons back on the new motor and also included a FAST 92/92 setup. The new setup is now down 40+ hp. How can this be? Would the forged pistions, which is all that we changed, rob me of that much power?

 

New rings, moly or steels?

Diffrent dyno?

 

Same dyno, should have been new rings as well. It was supposed to be a complete new build. Something is fishy though...

 

I guess what I am asking is would the forged pistons and maybe 1/2 point less compression rob me of 40+ hp?

 

bump....

 

I will say get it re-tune you change the intake and now you have more air flow and probably needs an adjustment

 

Done that...