Well off the top of my head the Vortec started post ‘96. You can tell by the # of bolts holding down the intake: 12 bolts = re Vortec, 8 bolts = Vortec. Also the pre Vortec bolts go into the intake manifold at an angle whereas the Vortec go in straight down. Do some more research on Chevy engine sites specifically Rapido Marine for the location of block and cyl head casting #s.
_________________ 88 Four Winns 200 Horizon 4.3 OMC Cobra-4bbl 2002 Walker Bay 10/2012 Suzuki 2.5 2008 Walker Bay 8
1998 Jeep Grand Cherokee 4.0/Selectrac 2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II
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