Re: Boring A intake for B carb....
Idealy, the manifold would have gentler curves (Larger Radii where the bends are) this would cut down on turbulence of the mixture. Also, the manifold is basically a "T" with the center part (Throat) feeding the two cross arms. I think that 1.250 and Brent's 1.300 are even too small. I was think of welding up a manifold with a 1.500 throat. Next time I run across a broken manifold, I think I will do this. But clearly, The A manifold is a constriction.
Terry
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