Non Chevy engines in Chevy trucks. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pontiac6269 · 08-23-2006, 06:53 PM

I have a 81 3/4 ton 2 w/d that I'm putting a Pontiac 400 in. The 350 has a main bearing rattle. Are 3/4 ton mounts in the same position as a 1/2 ton? I had to use the lower mounting holes on the mount plates, also had to move the plates back 1 inch on the drivers side and 1 1/2 inches on the passenger side. Then drill holes in the frame and crossmember. I've read where others have done this swap in 1/2 tons and just had to move the frame mounts up to the upper holes. I'm using the original turbo 400 with a TCI adapter plate so the trans is mounted in the original location. Has anyone else done any kind of swaps like this or other engine familys?

Thanks,
Eric

87 STEPPER · 08-24-2006, 06:28 AM

As far as i know all the crossmembers for the 1/2, 3/4, & 1 ton trucks are the same as far as the engine mount locations go the only thing thats differant is weather it has a big or small block thats what the other set of holes are there for.

Now the only thing i can think of is maybe the crossmember is differant for the diesel equipt trucks???

Maybe you misunderstood what you read or that person didn't explain what or how he did it clear enough.

I haven't seen any 73-87 chevy trucks with anything other than a chevy BBC or SBC engine in them.

Good luck

Slonaker · 08-24-2006, 08:43 AM

I drove a 70s 1/2 ton about 20 years ago that had a Pontic 400. The owner told me he used mounts out of the donor car (I can't remember what it was), and it was a direct bolt-in. I wish I could remember more details...

Slonaker

cliffsta · 08-24-2006, 12:46 PM

So you said you had the adapter plate for bolting up BOP to the Chevy uh, (is it the flexplate?)

Joe67 · 08-24-2006, 12:49 PM

My buddy puts BBC motors in Mustangs, anything is possible

87 STEPPER · 08-25-2006, 07:14 AM

It's funny after i say i haven't seen any of these trucks with anything other than a chevy engine in them i pick up an issue of classic trucks at wall mart yesterday and in the back is the readers rides and there is a 70's stepside with a 500ci caddy engine in it

pontiac6269 · 08-25-2006, 05:24 PM

I had it mocked up in the truck with a bare block and original transmission. The adapter plate adapts the Chevy transmission bell housing to a BOP engine. The block mounts to use are out of a 73-77 Lemans or Grand Prix.

Thanks,
Eric

ARAMP1 · 08-25-2006, 05:43 PM

Some of our trucks came with Olds motors in them stock (in the way of 5.7L diesels), so I couldn't see that it would be too much trouble swapping in a BOP engine.

WLPTMP · 08-26-2006, 12:11 PM

on the 73-87 i'm putting a caddy 500 in
the only thing i have to move is the fram side of the motor mounts about 2 inches forward and trim the coners if you are using stock steering

pontiac6269 · 08-27-2006, 08:53 PM

I have the engine and trans bolted down. Starter is on and wired, routing fuel lines. Got a set of 3 tube headers from a friend that actually fit, just have to bend shift linkage.

08-23-2006, 06:53 PM	#1
pontiac6269 Registered User Join Date: Mar 2004 Location: Sparta, WI Posts: 86	Non Chevy engines in Chevy trucks. I have a 81 3/4 ton 2 w/d that I'm putting a Pontiac 400 in. The 350 has a main bearing rattle. Are 3/4 ton mounts in the same position as a 1/2 ton? I had to use the lower mounting holes on the mount plates, also had to move the plates back 1 inch on the drivers side and 1 1/2 inches on the passenger side. Then drill holes in the frame and crossmember. I've read where others have done this swap in 1/2 tons and just had to move the frame mounts up to the upper holes. I'm using the original turbo 400 with a TCI adapter plate so the trans is mounted in the original location. Has anyone else done any kind of swaps like this or other engine familys? Thanks, Eric

08-24-2006, 06:28 AM	#2
87 STEPPER STILL PLAYS WITH TRUX Join Date: Nov 2002 Location: Melbourne, Fla. Posts: 2,764	Re: Non Chevy engines in Chevy trucks. As far as i know all the crossmembers for the 1/2, 3/4, & 1 ton trucks are the same as far as the engine mount locations go the only thing thats differant is weather it has a big or small block thats what the other set of holes are there for. Now the only thing i can think of is maybe the crossmember is differant for the diesel equipt trucks??? Maybe you misunderstood what you read or that person didn't explain what or how he did it clear enough. I haven't seen any 73-87 chevy trucks with anything other than a chevy BBC or SBC engine in them. Good luck __________________ ~~Bruce~~ MY 87 STEPPER MY 99 2D/WD TAHOE

08-24-2006, 08:43 AM	#3
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	Re: Non Chevy engines in Chevy trucks. I drove a 70s 1/2 ton about 20 years ago that had a Pontic 400. The owner told me he used mounts out of the donor car (I can't remember what it was), and it was a direct bolt-in. I wish I could remember more details... Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

08-24-2006, 12:46 PM	#4
cliffsta Stepsides RULE Join Date: Jul 2004 Location: Pineville, LA Posts: 1,921	Re: Non Chevy engines in Chevy trucks. So you said you had the adapter plate for bolting up BOP to the Chevy uh, (is it the flexplate?) __________________ 1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord

08-24-2006, 12:49 PM	#5
Joe67 67 is sold Join Date: Apr 2001 Location: Troy, Michigan Posts: 6,733	Re: Non Chevy engines in Chevy trucks. My buddy puts BBC motors in Mustangs, anything is possible __________________ Joe - Formerly 67c10step ------------------------------- 1967 Chevy Stepside - ECE 4/6, fuelcell, 5lug - SOLD gr8lakes - My ebay auctions Click here to order forum apparel :: Click here to become a subscribing member

08-25-2006, 07:14 AM	#6
87 STEPPER STILL PLAYS WITH TRUX Join Date: Nov 2002 Location: Melbourne, Fla. Posts: 2,764	Re: Non Chevy engines in Chevy trucks. It's funny after i say i haven't seen any of these trucks with anything other than a chevy engine in them i pick up an issue of classic trucks at wall mart yesterday and in the back is the readers rides and there is a 70's stepside with a 500ci caddy engine in it __________________ ~~Bruce~~ MY 87 STEPPER MY 99 2D/WD TAHOE

08-25-2006, 05:24 PM	#7
pontiac6269 Registered User Join Date: Mar 2004 Location: Sparta, WI Posts: 86	Re: Non Chevy engines in Chevy trucks. I had it mocked up in the truck with a bare block and original transmission. The adapter plate adapts the Chevy transmission bell housing to a BOP engine. The block mounts to use are out of a 73-77 Lemans or Grand Prix. Thanks, Eric

08-25-2006, 05:43 PM	#8
ARAMP1 ROCK*STAR Join Date: Aug 2005 Location: Pensacola, FL Posts: 202	Re: Non Chevy engines in Chevy trucks. Some of our trucks came with Olds motors in them stock (in the way of 5.7L diesels), so I couldn't see that it would be too much trouble swapping in a BOP engine.

08-26-2006, 12:11 PM	#9
WLPTMP Active Member Join Date: Sep 2005 Location: North Hudson NY Posts: 221	Re: Non Chevy engines in Chevy trucks. on the 73-87 i'm putting a caddy 500 in the only thing i have to move is the fram side of the motor mounts about 2 inches forward and trim the coners if you are using stock steering

08-27-2006, 08:53 PM	#10
pontiac6269 Registered User Join Date: Mar 2004 Location: Sparta, WI Posts: 86	Re: Non Chevy engines in Chevy trucks. I have the engine and trans bolted down. Starter is on and wired, routing fuel lines. Got a set of 3 tube headers from a friend that actually fit, just have to bend shift linkage.



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