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Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by Dune_Goon, Mar 16, 2001.
Post deleted by Dune_Goon
Re: Vortec Engine Block Question
Dune Goon, I don't think there is such a thing as a "Vortec block." There are Vortec heads, which will bolt onto a generic Chevrolet small block V8, but I don't think that the block put under those heads is any different than the standard Chevy small block (Jim will likely know more than me about this). The only difference I can see in the block from the pre-'87 blocks is the use of a one-piece rear main seal and the valvetrain is set up for the OEM hydraulic roller lifters. There are conversion kits to use the old 2-piece rear main seal crank in the newer blocks, and there are also 3.75" stroke cranks available for the one-piece rear main block. I'm going to be building a hydraulic roller motor with the older type crank in it (because I want to continue to run the same 12" clutch that I've grown to like very much), so I will be using one of the conversion kits for the rear main seal.
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