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**VetteVet** · 01-16-2008, 09:40 AM

I had the same thing in my 84 gmc s15 2.8 liter and it turned out to be the crank was broken. The darn thing still ran but made a lot of noise. That was pretty common with those small cranks but I haven't heard of any SBC engines doing it.
I would also pull the pan first and check. I think you should be able to repair it for under a grand if you don't need a lot of machining and if you do your own labor.

01-16-2008, 09:40 AM	#6
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,723	Re: oh no a knock!!!! I had the same thing in my 84 gmc s15 2.8 liter and it turned out to be the crank was broken. The darn thing still ran but made a lot of noise. That was pretty common with those small cranks but I haven't heard of any SBC engines doing it. I would also pull the pan first and check. I think you should be able to repair it for under a grand if you don't need a lot of machining and if you do your own labor. __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.