1963 GMC 305-CID V6
The 305-cubic-inch (5.0 L) 305 had a 4.25 in (108 mm) bore and 3.58 in stroke (90.9 mm). The 305 V6 was the standard pickup truck engine for GMC from 1960 to 1966, and was one of the first V6 engines produced by an American company.
They also produced the V6 with displacement of 351, 379, 401, 432, 478, and 702. But the 702 was actually a V12 block with two separate carburetors, two distributors and 4 exhaust manifolds.[link]
A website dedicated to the V6 GMC's: [link][link]
Tallyworld car show
April 12th, 2010