Re: Merc manifold bore spacing and size
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Obviously, there were TWO different sizes of the BORES in baseplates between the "Small" 2Gs, and the "Big" 2Gs. The base bores in the little ones was 1-1/4" diameter. The base bores in the big 2Gs was 1-1/2". DD
Going by a chart that I cannot reproduce:
SMALL 2Gs all had 1-3/32" venturis = 278 CFM.
The BIG 2Gs had four different venturi sizes, w/four different CFM ratings.
1-3/16" venturi = 352 CFM
1-1/4" venturi = 381 CFM
1-5/16" venturi = 423 CFM
1-3/8" venturi = 435 CFM
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