GMC inline 6 where to start for killer motor

I've always liked this one, don't know much about it tho sorry.


Scotty

 

Here is a Wayne 12 port on a 302 in 1964 and it was a 11.00 second car then. Wayne, and others had twelve ports out for Chevy's and GMC's since the 1950's. There is now a Skinner for a 292 Chevy too.
Normbc9

 

The photo didn't go the first time. This is the Rollema and Teague car from the '60's.
Normbc9

 

Interesting read.

I'm looking at a '57 GMC truck that has a 270 in it. Anyone have thoughts on what a buildable 270 would be worth? Ran with a little smoke about 5 years ago. Turns over now.

If I buy the truck the engine will be for sale.

Thanks. Jim

 

Jim,

Depending on how complete ( Bell Housing, Manifolds, etc.) maybe $300 - $600. The 270 will cost just a little more than a Chevy 261 to build for a hotted-up truck or rod. There was a guy near Atlanta asking $800 for a very complete rebuilder 261 on ebay; he wasn't getting any takers at that price.

Good luck with it, Kinky6.

 

Thanks for the info. This one is stock and all there. I was hoping it would bring more than that.

Jim



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What's the cost to rebuild a 302 these days? Are parts readily available or will you run into trouble finding them?
Also when I say cost I'm talking mildly hopped up. Not the Wayne head, billet flywheel, etc...

 

GMC in my buddy's Indy car

 

Maybe $2.5-4K, How good a friend is your local machinist? The GMC has its quirks, such as the main bearing journals are each a different size, so when you line bore the block and turn the crank, those each are a separate set-up and measure process.

The stock pistons are sort of heavy for turning any RPMs, though you're probably not looking for a high redline on a street engine anyway. A good set of cast pistons, machined to the 3 7/8 bore, or some forged pistons from Venolia would let it rev all you need for street use. As long as you're getting new pistons, look up what a 270 will take for an overbore. 292" is about the safe max. The 302 block has a stock 4.00" bore, so the 292" overbore is just a little smaller.

A good cam, slightly stiffer springs, hardened exh. seats, stock rods, bearings, oil & water pump, and so on. Some of the bearings may take some searching for. One trick is to have the flywheel drilled to take a common Chevy V8 pressure plate.

Probably in the ball park for rebuilding a '50's era Olds V8.

Later, Kinky6

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