I need some quick advice. I 'm getting ready to install an all forged 347 with an MS4 cam. The heads I have are stock LS1 with 2.02 / 1.60 valves and a good port job. The shop I let do the head work had not much experiance with the LS1 heads. The machine shop that built my motor claims for another 600.00 they could get my heads to flow over 300 since most of the work is done. They claim they have a few secrets with the sevral thousands hours of flow bench time on the LS1 heads. So is it worth the extra money? Afraid I'm not gonna get the most out of my set up with them the way they are? i also plan on going up to a 150 shot of N2O.

 

What's the name of the machine shop? If I were you, just save the money and put it towards a 9" rear end or a better fuel pump.

 

Phillips Racing. I plan on a fuel pump and 42# injectors.

 

TTT thanks