engine swap 72 custom camper - The 1947 - Present Chevrolet & GMC Truck Message Board Network

torino · 07-16-2012, 08:18 AM

Hello, I am new to the forum...I have a 72 GMC 3/4 T custom camper. The original 402 ci engine is Kaput, I have a chance to pick up a good running Olds 455 from a 74 delta 88 c/w trans. Also still have the T400 from my truck. Can someone help to say if the 455 will bolt in where the 402 came out? Can the original mounts be used? I know the exhausts wont fit and the accesories will be different and I can deal with that but Im not interested in doing custom frame work Any advice is much appreciated. Thanks

Rick

MARKDTN · 07-16-2012, 03:35 PM

No. The trans will not bolt to the engine. Buick/Olds/Pontiac/Cadillac is a different transmission pattern as a Chevy. Also the motor will not bolt to factory mounts. 455 Olds is definitely worth something, sell it and buy a 454 crate engine. You will be better off.

ole dollor · 07-16-2012, 05:37 PM

i am sure it will fit, but you will have to make a lot of mods. on the motor mounts and trans mount. you would have to use the olds. trans. and the drive shaft may need some mods...then exhaust , and no telling what else ....in the late 70 and 80's. this was a common thing on the chevy 5.7 diesel motors...they were an olds motor to start with and i put several olds gas motors in and took the diesel out...it was a easy swap...but yours would not be a simple swap.....but it would be kool to have on in your pickup if you wanted to spend the time....

torino · 07-16-2012, 11:57 PM

Thanks Guys. Thats kinda what I figured. I will keep looking around. Cheers

MARKDTN · 07-17-2012, 02:56 PM

I guess if you used the whole front crossmember from a '73-87 and used the Diesel mounts it would work. I have a '79 that had a diesel in it and now has a gas Olds 350.

MARKDTN · 07-18-2012, 07:53 AM

There is an active thread with an Olds powered truck

http://67-72chevytrucks.com/vboard/s...d.php?t=452193

You can see how it fits, but I still wouldn't do it if not already done. You already have a big block truck with all the correct pulleys and brackets and manifolds. If it were me I would buy a crate 454 and put in there.

**RenoKeene** · 07-18-2012, 08:22 AM

Welcome aboard from Central FL. There are some 402s and parts for sale on the parts board.

OJ1988 · 07-18-2012, 01:04 PM

It would be a lot cheaper, easyier and retain the value of the truck more more if you rebuilt the 402.

07-16-2012, 08:18 AM	#1
torino Registered User Join Date: May 2012 Location: edmonton, alberta Posts: 2	engine swap 72 custom camper Hello, I am new to the forum...I have a 72 GMC 3/4 T custom camper. The original 402 ci engine is Kaput, I have a chance to pick up a good running Olds 455 from a 74 delta 88 c/w trans. Also still have the T400 from my truck. Can someone help to say if the 455 will bolt in where the 402 came out? Can the original mounts be used? I know the exhausts wont fit and the accesories will be different and I can deal with that but Im not interested in doing custom frame work Any advice is much appreciated. Thanks Rick

07-16-2012, 03:35 PM	#2
MARKDTN Registered User Join Date: Jan 2011 Location: Chattanooga, TN Posts: 2,167	Re: engine swap 72 custom camper No. The trans will not bolt to the engine. Buick/Olds/Pontiac/Cadillac is a different transmission pattern as a Chevy. Also the motor will not bolt to factory mounts. 455 Olds is definitely worth something, sell it and buy a 454 crate engine. You will be better off. __________________ '83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project

07-16-2012, 05:37 PM	#3
ole dollor Registered User Join Date: May 2012 Location: Anton, Texas Posts: 2,364	Re: engine swap 72 custom camper i am sure it will fit, but you will have to make a lot of mods. on the motor mounts and trans mount. you would have to use the olds. trans. and the drive shaft may need some mods...then exhaust , and no telling what else ....in the late 70 and 80's. this was a common thing on the chevy 5.7 diesel motors...they were an olds motor to start with and i put several olds gas motors in and took the diesel out...it was a easy swap...but yours would not be a simple swap.....but it would be kool to have on in your pickup if you wanted to spend the time....

07-16-2012, 11:57 PM	#4
torino Registered User Join Date: May 2012 Location: edmonton, alberta Posts: 2	Re: engine swap 72 custom camper Thanks Guys. Thats kinda what I figured. I will keep looking around. Cheers

07-17-2012, 02:56 PM	#5
MARKDTN Registered User Join Date: Jan 2011 Location: Chattanooga, TN Posts: 2,167	Re: engine swap 72 custom camper I guess if you used the whole front crossmember from a '73-87 and used the Diesel mounts it would work. I have a '79 that had a diesel in it and now has a gas Olds 350. __________________ '83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project

07-18-2012, 07:53 AM	#6
MARKDTN Registered User Join Date: Jan 2011 Location: Chattanooga, TN Posts: 2,167	Re: engine swap 72 custom camper There is an active thread with an Olds powered truck http://67-72chevytrucks.com/vboard/s...d.php?t=452193 You can see how it fits, but I still wouldn't do it if not already done. You already have a big block truck with all the correct pulleys and brackets and manifolds. If it were me I would buy a crate 454 and put in there. __________________ '83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project

07-18-2012, 08:22 AM	#7
RenoKeene Florida Edition Join Date: Oct 2010 Location: Fruitland Park, FL Posts: 4,029	Re: engine swap 72 custom camper Welcome aboard from Central FL. There are some 402s and parts for sale on the parts board. __________________ 70 GMC Short Stepside "Rose"-An American Beauty: Factory 402/TH400, AM/FM, AC, Tilt, Tach, Buckets, Posi, PS, PB, 3-5 Drop, Complete Resto-Rod 67 C-20 Slant Back Wrecker "Mad Max" 67 C-10 Ratrod "Step-N-Wolf" 71 Serro Scotty Sportsman camper "Scotty" 97 LT1 Z28 "The Hornet" Link to more pics of "Rose" http://67-72chevytrucks.com/vboard/a...p?albumid=1684 Check out my "Cheap Tricks" thread and add to it if you can, lots of good info there. http://67-72chevytrucks.com/vboard/s...d.php?t=489394

07-18-2012, 01:04 PM	#8
OJ1988 Just a car guy Join Date: Feb 2006 Location: New Washington, IN Posts: 991	Re: engine swap 72 custom camper It would be a lot cheaper, easyier and retain the value of the truck more more if you rebuilt the 402. __________________ 1955 belair Blown Pro Street cruiser 1971 Camaro Pro Touring 1973 Vega Drag Car 1970 C20 tow rig



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