Measuring the height of the intake port roof, as in the picture above:
2V = 2.5"
4V = 3.0"
CHI = 3.1" or more
SVO = 3.25"
Yates C3 & C3L = 3.5"
Yates C3H, SC1, D3 = 4.0"??
I'm referring to manifolds for Yates C3 & C3L heads
If the part number starts with M-9424 (last digit is a 4) it was machined for 9.2" deck blocks
If the part number starts with M-9425 (last digit is a 5) it was machined for 9.5" deck blocks.
the 1996 catalog lists 3 manifolds (M-9425-A351, M-9425-E351, M-9425-W351) all for 9.5" blocks & Yates C3 heads
by 2001 only the M-9425-W351 manifold remained in the catalog.
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If you use a 351C 4V powered vehicle for a grocery getter ... the eggs aren't going to make it home!