Truck came with 305 have put 4 different 350.

Tiny
ANONYMOUS
  • 1989 GMC SIERRA

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

Thursday, February 7th, 2013 AT 6:44 PM

1 Reply

Tiny
ASEMASTER6371
  • EXPERT
  • 25,554 POSTS

Nope, nothing,

did you replace the radiator? A clogged radiator will overheat all your motors

Roy

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Friday, February 8th, 2013 AT 12:38 AM

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