I am new to the boards here and need some outside advice on building a 650 HP 468 BBC on pump gas.The pistons are SRP, will rework to 11.5-1 with a 122 CC head. The cam i have is a solid roller .691/.684 .262/.272 @.050 on a 112 LC I am going to run a 250 HP shot of nitrous on this combo too so thats why the 112 LC My biggest problem is picking a set of heads. I have it narrowed down to a set of trick flow 320 rec ports. My engine builder wants to see bigger flow numbers on the exhaust ports to help the motor RPM to where it needs to be. this is also to accomodate the nitrous too. It is a sea of numbers out there, and i am scared to buy a set of heads in fear of going to big, on the same token, i am looking to spin this motor to 7000 RPM. So what is a smart rec port head for a 3500 lb pro street car.
I have run a best of 11.72 @ 115 with a oval port 427 with RPM performer heads and a hydraulic roller cam. The car went 9.92 @ 130 with a 1.39 60 foot with a 250 HP shot. through the mufflers and tail pipes. this was done with all small port stuff, so thats why i am scared to go real big? i am getting all kinds of advice, but nobody can tell me what to expect?
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