I think I've seen half a dozen different lengths over the years of Chevrolet 216-235 engines. Some of the older types didn't even have a tube but stuck directly into the block.

GMC is even worse with the different models of trucks.

I know it doesn't help, but oh well...

Jeff

My 1953 Chevrolet
1947.1 Gallery
1972 C-10 1/2 Ton & 1972 C-30 1 Ton