It has a 454 bored 60 over with 10:1 pistons in it, about 590 hp on the dyno, it is a work in progress. You building the GMC? good used grills are dificult to find but can be bought new from LMC.
These trucks are worth a chuck if you get them running and looking good. You have a great foundation, now see what you can do with it. As you can tell I am partitial to this model truck. Good Luck
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