Small Block V8 305, 2bolt, Vortec truck, roller cam, 1piece rear seal Small Block V8 350, 4 bolt, crate engines and ZZ4, roller cam, one piece rear seal Chevrolet Block Identification number locations Question is (beyond what it takes to swap from 305 to 350) is it possible, and cost effective to rebuild a '79 350 to drop it in a '97 sierra or just buy a new 350 long block from gm that'll drop right in and be brand new Of course the pride associated with building your own engine goes a long way Link to post350 are basically the same engine The 305 just has a smaller bore(3736 vs 4000), not quite the power or torque, but durability should be almost identical
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