What engine would a 1970 GMC 1/2 ton longbox have? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Russell · 02-22-2006, 12:33 AM

Howdy!

I helped recover a kid's truck after it's starter apparantly failed the other night. It wouldn't crank, but the solenoid was working properly. We wound up flat towing it to his shop, and at that point, I gave him my number incase he needed more help.

He replaced the starter, and found the new one was doing the exact same thing, and eventually found that his engine is apparantly seized up.

He bought a used 305 for the truck, and gave me a shout tonight asking if I could help him replace the engine this weekend.

Of course, I said yes, but I'd be interested in the old engine. (I'm thinkin 70 engine will have higher compression, better flowing heads than I have now)

However, I am wondering what engine would have come in that truck? Would it be a 350, or could be be something else like a 307, or 327?

Possiblity of it having double hump heads?

Thanks!

Russ

longhorn71 · 02-22-2006, 12:49 AM

i would say most likly a 307

**Palf70Step** · 02-22-2006, 06:38 AM

Could be a 305 V6, 307 or 350 V8. I doubt it has the double humps if it is a V8.

Longhorn Man · 02-22-2006, 08:36 PM

If it is an original CE truck, and there is no listing in the glove box, and it is the original engine (that's a lot of assumptions) then it'll be a 307. A 350 was the only other small block offered.

02-22-2006, 12:33 AM	#1
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	What engine would a 1970 GMC 1/2 ton longbox have? Howdy! I helped recover a kid's truck after it's starter apparantly failed the other night. It wouldn't crank, but the solenoid was working properly. We wound up flat towing it to his shop, and at that point, I gave him my number incase he needed more help. He replaced the starter, and found the new one was doing the exact same thing, and eventually found that his engine is apparantly seized up. He bought a used 305 for the truck, and gave me a shout tonight asking if I could help him replace the engine this weekend. Of course, I said yes, but I'd be interested in the old engine. (I'm thinkin 70 engine will have higher compression, better flowing heads than I have now) However, I am wondering what engine would have come in that truck? Would it be a 350, or could be be something else like a 307, or 327? Possiblity of it having double hump heads? Thanks! Russ __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

02-22-2006, 12:49 AM	#2
longhorn71 Senior Member Join Date: Sep 2004 Location: CANADA Posts: 1,681	Re: What engine would a 1970 GMC 1/2 ton longbox have? i would say most likly a 307

02-22-2006, 06:38 AM	#3
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,216	Re: What engine would a 1970 GMC 1/2 ton longbox have? Could be a 305 V6, 307 or 350 V8. I doubt it has the double humps if it is a V8. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

02-22-2006, 08:36 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: What engine would a 1970 GMC 1/2 ton longbox have? If it is an original CE truck, and there is no listing in the glove box, and it is the original engine (that's a lot of assumptions) then it'll be a 307. A 350 was the only other small block offered.

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