Heads, how much gain?

roccodart440 said

I run them. 345cfm on the intake and with a mild cam and compression made 600HP@5900

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Who did the porting work? I am at about 370 HP with iron J heads with 2.02 intakes and a Comp 268 XE cam, headers and a complete MSD ignition setup. I'd hate to spend $2,000 on a pair of ported Eddy heads and have an unnoticeable power increase.