[reacp911]

It's common knowledge that the pontiac edelbrock performer is not as good as even the stock cast iron pontiac restricted secondary manifold.

I took a mold of on of the runners to see what we were dealing with. The runner dimensions near the plenum are 1.275 by 1.720= 2.19in2, compared to 1.1 by 2.07=2.277in2 for the stock 6x cylinder head port sizes.

Why on earth would edelbrock produce a manifold with runners 4% smaller than a standard pontiac head port?

I'm kind of stuck running the performer because I've got the aluminum D port heads, and I'm trying to keep it looking stock so torquers and RPM manifolds are out.

All edelbrock needs to do is take a stock 455SD manifold and recast it out of aluminum. I'm sure they'd sell lots