1986 GMC Sierra - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mercman1951 · 07-05-2007, 02:13 AM

Hi all, new to the board, but not new to older Chevy/GMC longbeds. I had an '85 Scottsdale 2WD a couple years back.

I recently bought this '86 GMC fullsize 2WD...it has a "rebuilt 350" w/ "less than 20,000 miles", and a rebuilt TH350. It runs decent with an Edelbrock intake and 650 carb, but looking at the valve covers, this sucker is from the 70's. I'm trying to figure out just what 350 replaced the stock 305 in my truck. I know on big blocks you can use the numbers stamped on the end of the block, by the head. Where are the stampings on a 350- assuming it hasn't been decked already? Thanks in advance-

07-05-2007, 02:13 AM	#1
mercman1951 Registered User Join Date: Jun 2007 Location: Hartland, MI Posts: 60	1986 GMC Sierra Engine Decoding Question Hi all, new to the board, but not new to older Chevy/GMC longbeds. I had an '85 Scottsdale 2WD a couple years back. I recently bought this '86 GMC fullsize 2WD...it has a "rebuilt 350" w/ "less than 20,000 miles", and a rebuilt TH350. It runs decent with an Edelbrock intake and 650 carb, but looking at the valve covers, this sucker is from the 70's. I'm trying to figure out just what 350 replaced the stock 305 in my truck. I know on big blocks you can use the numbers stamped on the end of the block, by the head. Where are the stampings on a 350- assuming it hasn't been decked already? Thanks in advance- Attached Images Last edited by mercman1951; 07-05-2007 at 02:33 AM.



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