The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 55.2-59 59 GMC 270-336 swap.

mr48chev · 11-13-2021, 04:34 PM

Unless you are absolutely bent on keeping the truck all "GMC" why would you waste time and money sticking an old Pontiac engine in the truck?

Your money your call but I would put a later small block Chevy in it and be done with it.

Any 336 engine that isn't documented as a fresh engine with low miles has to be considered to only be a core engine that needs a total and rather expensive rebuild. Plus you have to deal with how you are going to bolt it to the transmission. Meaning that you need a different flywheel and bellhousing. It's isn't just a case of "I'm going to buy this used engine and stick it in and go" 99% of the time when dealing with a 60 year old engine.

I'd have to say what is more important, being able to drive and enjoy the truck or being able to open the hood and show folks at a show that it has a GMC /Pontiac V8 in it.

11-13-2021, 04:34 PM	#2
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,322	Re: 59 GMC 270-336 swap. Unless you are absolutely bent on keeping the truck all "GMC" why would you waste time and money sticking an old Pontiac engine in the truck? Your money your call but I would put a later small block Chevy in it and be done with it. Any 336 engine that isn't documented as a fresh engine with low miles has to be considered to only be a core engine that needs a total and rather expensive rebuild. Plus you have to deal with how you are going to bolt it to the transmission. Meaning that you need a different flywheel and bellhousing. It's isn't just a case of "I'm going to buy this used engine and stick it in and go" 99% of the time when dealing with a 60 year old engine. I'd have to say what is more important, being able to drive and enjoy the truck or being able to open the hood and show folks at a show that it has a GMC /Pontiac V8 in it. __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.