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Terry, NJ · 07-30-2019, 11:08 PM

I have drilled out quite a few A manifolds to 1.25+ with good results with a B carb. The 1.25" bore of the B allows it to process more air. The A engine does not breathe well in stock form. I would like to take a stock B carb and bore the throat out, but I feel that.020 - .030 is about the max you could go with it, but it would be an improvement. I believe Dennis Piriano has done extensive dyno testing that includes A-B carbs, Drilled and undrilled manifolds and various other mods. Check out Piriano's model A Tests.
Terry

07-30-2019, 11:08 PM	#10
Terry, NJ Senior Member Join Date: May 2010 Location: Bucks Co, Pa Posts: 3,740	Re: Marvel vs Model B carb? I have drilled out quite a few A manifolds to 1.25+ with good results with a B carb. The 1.25" bore of the B allows it to process more air. The A engine does not breathe well in stock form. I would like to take a stock B carb and bore the throat out, but I feel that.020 - .030 is about the max you could go with it, but it would be an improvement. I believe Dennis Piriano has done extensive dyno testing that includes A-B carbs, Drilled and undrilled manifolds and various other mods. Check out Piriano's model A Tests. Terry