Edelbrock E-Street vs Performer RPM Heads

rumblefish360 said

I remember this being discussed somewhere. IIRC, it has cheaper & different valves and a lighter valve spring.

I am not 100% sure though.

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so has anyone here bought a set of E-streets for a big block and used them out of the box with no extra porting? Wondering how much performance was gained over the stock iron heads..