i have an edelbrock performer intake on my 87 Z28

would i see any performance gains if i was to gasket match the intake??

i sort know how to do it, but how deep into the manifold do i go?

thanx

 

Just blend it smoothly and consistently into the runner as it flows back. An inch or inch and a half back ought to do it.

 

There are two schools of thought on this. One says "Maximize flow, provide smooth path throughout induction system." The other says, "A slight step there will help 'anti-reversion', smoothing out the idle and increasing part-throttle torque with a healthy cam."

I took the second tactic since I figured: a) my 305 wouldn't flow as much as the 350 the intake was designed for; and, b) I didn't want to take the time doing the gasket match while the engine/car was down for the mods. My heads are gasket matched, by the way.

Hard to know which one is the right way to go, since once gasket matched, you can't go back (unless you buy another manifold). But, with a 305, it probably isn't going to provide much benefit. I sure like the way mine runs, though.

For reference, my cam is .454/.480, 216/228. I would guess my manifold flows a little better out of the box than yours, but I've never seen a back-to-back comparison of the two.

 

Gasket maching the head to the manifold ports
will help. Do not make the mistake of hogging out
the port openings of either the manifold or the head.
This will create a bulge in the airflow path and can create turbulance.
Bigger is not better here but you can square up and align the ports using a gasket as a guide.