Quote:

RPM AIR GAP ????

Don't all big block mopar wedge engines have an "AIR GAP" intake by DEFAULT ????

just thinking out loud




Yep, that would be correct John. The turkey pan creates the "air gap" between the manifold and the hot engine lube.


The SB mopars don't have a turkey pan and the bottom of the intake itself seals in the oil. The SB airgap design creates the same open space that BB engines have.

The original SB RPM dual plane was a non airgap design and the updated version has the runners raised off of the sealing surface, hence the airgap moniker.

From the Eddy website :

"The air-gap design features an open air space that separates the runners from the hot engine oil resulting in a cooler, denser charge for more power."

http://www.edelbrock.com/automotive_new/mc/manifolds/chrysler/chrysler.shtml


Compare pix of the standard SB RPM to the Airgap RPM and the difference will be obvious.

***For purposes of this discussion ; "Air Gap" has nothing to do with heat crossover....at least not in terms of the way that it is referenced by Edelbrock.


Back on topic : I like the Airgap RPM for that build as well. Buzz, are you planning to dyno it ?



Ron