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Old 07-22-2012, 10:59 PM   #12
Captainfab
60-66 Nut

 
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,246
Re: How do I Identify my vortec?

Both the block and heads will have the casting date on them

As far as I know all L31 Vortec long blocks are the same, aside from the 2 bolt/4bolt mains. The only differences I am aware of are with the PCM and the wiring.
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