[surfsama]

Originally Posted by Tom Vaught

Agree, RPM manifold is designed for a Holley carb.
Nos plate probably designed for a Holley carb and RPM intake.

He is trying to run a Q-JET Carb with a Q-JET NOS Plate on a square bore manifold.

The center divider will not be the issue, the issue will be the edges of the intake opening.

Tom V.

I could be misreading the OPs post but if he's talking about an Edelbrock Performer RPM manifold it has a spreadbore configuration (at least for the Pontiac engine).

[chiphead]

Correct, the RPM accepts spreadbore carbs but has the 4150 bolt pattern too. I did lay the opening back and knife edge the center divider to clear the spraybar pattern. I had to gouge and blend the carb pad at the ends of the center divider, so the spray pattern will spray down the plenum.

[HWYSTR455]

Originally Posted by chiphead

Correct, the RPM accepts spreadbore carbs but has the 4150 bolt pattern too. I did lay the opening back and knife edge the center divider to clear the spraybar pattern. I had to gouge and blend the carb pad at the ends of the center divider, so the spray pattern will spray down the plenum.

That's what I did too, just like you did, laid the plate on there and smoothed all transitions, and knife-edged the divider. 4150-type carb tho. I ran a NOS Cheater plate initially, then went to a NX perimeter plate, but never filled the bottle. I had no issues though with the gap from an open plate with the RPM (with a 4150).

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