Holley Help Needed

Ozcuda said

OK the single plan manifold is an old Edlebrock streetmaster it is a very old manifold & I was recommended to use a single plan as it would work better on the drag strip that is why I put it on as it was just sitting here doing nothing I decided to give it a try...

The dual plan is a Edlebrock performer

Click to expand...

The Edelbrock Streetmaster is an economy intake that is literally choking your 360. Even though it's a single plane intake, it was designed for fuel mileage and very low rpm torque around the mid-'70's during the first fuel shortage. SP2P and the OLD original Torker are bad manifolds also.

As others have suggested, a 750, preferably with vacuum secondaries, would help, but not with the Streetmaster.

A regular Edelbrock Performer would be a step up, but it has smaller runners than better intakes for your combo, like LD340, Performer RPM & Air Gap, Weiand Stealth, LD4B. These are all dual plane intakes and I think would be better overall than a single plane intake.