Does this look right? - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

toolboxchev · 10-28-2019, 07:29 PM

Quote:

Originally Posted by AussieinNC

Sadly so many fall for the old "its a Corvette engine".....

heehahhaahheheheheheeee!

Andy4639 · 10-28-2019, 10:14 PM

Ok drove the ramp truck today and it did fine. It did back fire once but after that it did fine. It was right after I cranked it up for the first time. It cut off and when I went to refire it it back fired. I didn't have anymore problems after that it drove good and the brakes even seemed better. I guess the vacuum leak was hurting the booster effect on them.

**Ironangel** · 10-29-2019, 07:22 AM

The missing link COPO Corvette motor! Backfiring through the exhaust when you let off the pedal is an exhaust leak. Whats the block casting number?

Andy4639 · 10-29-2019, 09:23 AM

No backfiring through exhaust. It popped through the carb but after that it was fine the rest of the day. It could have been me trying to cold start it also. Pumping the gas pedal while cranking it! I drove it all afternoon and cut it off several times and never did it again.

Fixing to go drive it again to the shop to work on pulling the 68 cab off I hope.

**Steeveedee** · 10-30-2019, 10:01 AM

Quote:

Originally Posted by AussieinNC

I have found two bolt carb mountings on 70's on engines, mainly 305's....

Has the OP determined the engine is a 350 ?

As the OP mentions the engine is not original...it may just have the small port 2 barrel manifold bolted on...

Oh, yeah. I remember those now. I think they did it starting in '71? I worked for a dealer in those days. You'd think I'd remember that. :shrug:

BigBird05 · 10-30-2019, 06:36 PM

As others have said 307's of that era did come with just 2 carb studs and nuts.

**Steeveedee** · 10-30-2019, 08:22 PM

I guess with a cast iron base and a vacuum underneath, the carbs just got sucked down onto the gasket!

One thing that Chevrolet got bit on the booty with though was putting 2-row radiators in the '71 big cars with the 400 small block. We had a line of them in the service lot with severely overheated engines. All got a retrofit to a higher row count radiator. Ever seen a blue torque converter!? That's some hot stuff, right there.

10-28-2019, 10:14 PM	#27
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Does this look right? Ok drove the ramp truck today and it did fine. It did back fire once but after that it did fine. It was right after I cranked it up for the first time. It cut off and when I went to refire it it back fired. I didn't have anymore problems after that it drove good and the brakes even seemed better. I guess the vacuum leak was hurting the booster effect on them. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

10-29-2019, 07:22 AM	#28
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Re: Does this look right? The missing link COPO Corvette motor! Backfiring through the exhaust when you let off the pedal is an exhaust leak. Whats the block casting number? __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"

10-29-2019, 09:23 AM	#29
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Does this look right? No backfiring through exhaust. It popped through the carb but after that it was fine the rest of the day. It could have been me trying to cold start it also. Pumping the gas pedal while cranking it! I drove it all afternoon and cut it off several times and never did it again. Fixing to go drive it again to the shop to work on pulling the 68 cab off I hope. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

10-30-2019, 06:36 PM	#31
BigBird05 Registered User Join Date: Aug 2019 Location: Cheraw Posts: 1,300	Re: Does this look right? As others have said 307's of that era did come with just 2 carb studs and nuts.

10-30-2019, 08:22 PM	#32
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,724	Re: Does this look right? I guess with a cast iron base and a vacuum underneath, the carbs just got sucked down onto the gasket! One thing that Chevrolet got bit on the booty with though was putting 2-row radiators in the '71 big cars with the 400 small block. We had a line of them in the service lot with severely overheated engines. All got a retrofit to a higher row count radiator. Ever seen a blue torque converter!? That's some hot stuff, right there. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA



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