This has been by far the toughest decision i think i've had to make on my build and i really wanna get it over with and order cams but i don't wanna order them and then realize i made the wrong choice.

I think the main things here to take into consideration are
1.My car is going to be Naturally Aspirated.
2.Its a C headed car, i think this one is particularlly important

i think i have to notch my pistons with either set but idc too much about that, and both will require new valvesprings.

Being a C headed car i had orginally been drawn to the 400s (set one) and not revving that high, but then i saw the 500s and they reved just a little higher, both have the same lift, but duration @ .50 and overall is a little more on the 500s, but see for yourself.


1. the 400s http://www.jegs.com/i/Comp+Cams/249/106400/10002/-1
2. the 500s http://www.jegs.com/i/Comp+Cams/249/106500/10002/-1

any other suggestions are welcome, thanks in advance.

C head dimensions: Combustion Chamber: 54cc, Intake Port Vol.: 177cc, Intake Port Entrance: 1.960”x1.350”, Valves: 37mm Int., 30mm Exh.

my heads will be reciving a stage 1 port.