spread bore and square bore
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Joined: Dec 2001
Posts: 22,436
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From: Louisville,Ky.
Lets try that again.
A Square bore carb has all 4 throttle plates basically the same size Such as a Holley 4150/4160 or and Edelbrock/Carter AFB/AVS
A Spread bore carb will have 2 small throttle plated in the front and 2 large ones in the rear such as a Carter Thermoquad, Quadrajet, or a 4350 Motorcraft.
A Square bore carb has all 4 throttle plates basically the same size Such as a Holley 4150/4160 or and Edelbrock/Carter AFB/AVS
A Spread bore carb will have 2 small throttle plated in the front and 2 large ones in the rear such as a Carter Thermoquad, Quadrajet, or a 4350 Motorcraft.
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New User
Joined: May 2004
Posts: 15
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From: live in Colorado, school is in New York
I have an edelbrock 4 barrel 1405 carb which would be a square bore. I also have a square bore intake manifold. When I put a spacer in between the two does it need to be a square bore with four seperate holes or can it be an open spacer?
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