GMC pickup help....

Tamper84

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Hey guys, I know that this isn't a mechanics forum, but the place feels like home to me and I figured I would ask. I have an 86 gmc 3/4 ton that has started a pretty big oil leak. It's either the rear main or coming from the back of intake. The problem is, I need help identifying the engine. The p.o. told me its a 283 out of a 69 Chevelle, but I do know they stopped making the 283 in 66 or 67. But considering the size I do believe it is a 283. (Before this truck I have been an all Ford guy) But is there any way to tell what engine I have so I get the right gaskets?

Thanks,
Chris
 
Randy thank you for the site. I will have to check it out.

Bill I will post a picture when I get home. Other then this oil leak it does run pretty good. And that's why I was thinking its not a 69 motor. I'm just hoping if it is the rear main, it still doesn't have the rope seal in it!!

Thanks,
Chris
 
Sounds like you have the HO 350 engine. They were a bear. We called them "Stump Pullers". They were a high torque engine. Team that engine with a Muncie M22 "Rock Crusher" 4 speed and it was unstoppable. Guess I ain't as old as I thought. Thanks for the trip down memory lane.

http://www.oldride.com/library/1969_chevrolet_chevelle.html

"Billy G" :thinking:
 
Well if it is a ho engine it's sicker then I thought lol. This motor isn't a power house lol. But I'm at work right now posting from my iPhone :whistle: So I will post a picture when I get to the house. Probably around 3:30 or so.

Thanks,
Chris
 
Where is my head this morning. I shoud have said 2nd generation HO. But then everyone has there own opinion of the HO. 350-350 in a 70 Elcamino does weird things. :lmao::lmao:

"Billy G"
 
Hmmm -- Giving this some thought I went to the book and it seems the HO first went into Pontiacs in 1968. It just might be one. Some were good, some weren't acording to GM stats.

"Billy G" :thinking:
 
Not a 283. Cheverolet was stamped from the inside of the valve covers. Aso that is not a 283 exaust manifold. Looks like a 350 to me. Here are the block casting numbers in order of production.

http://www.thedirtforum.com/castings.htm

"Billy G" :thinking:
 
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