1989 Gmc Sierra Hi Truck Came 305 Put 4 Different 350 Runs Good Awhile

1989 GMC SIERRA
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Hi truck came with 305 have put 4 different 350 in.runs good for awhile says overheating by light and gauge oil pressure gauge always maxed out.why do motors keep blowing head gaskets and or head?do i need to pull ecm andhave flashed for 350 also need change tbi injectors
Feb 7, 2013 at 6:44 PM
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