square bore vs spread bore

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Nov 1, 2014 | 08:05 PM

hilbily

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Joined: Jul 2014

Posts: 98

From: Georgetown Ca.

square bore vs spread bore

Anybody ever run a square bore Holley on a spread bore manifold, did it work ok? Can it be run without an adapter plate?

Nov 1, 2014 | 08:11 PM

oldcutlass

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Joined: Oct 2009

Posts: 42,475

From: Poteau, Ok

It will not mount without an adaptor, you'll have vacuum leaks. It's been done with an adaptor forever with success. I prefer going with an aluminum manifold setup for a square bore.

Nov 1, 2014 | 08:12 PM

Fun71

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Joined: Feb 2013

Posts: 15,394

From: Phoenix, AZ

Quote:

Originally Posted by hilbily

Can it be run without an adapter plate?

Only if the intake manifold is drilled with a dual bolt pattern to accept either type of carb flange.

Nov 1, 2014 | 08:39 PM

hilbily

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Joined: Jul 2014

Posts: 98

From: Georgetown Ca.

It is drilled with a dual pattern, I was more concerned with sealing, it seems like it only has about a 1/4" around the secondary flange.

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