[jturbo7]

I have a 66 GTO with a 454. I hear that the frame should be the same as a 66 Chevelle, but everytime I call around for Chevelle motor mounts they tell me they are not the same. Does anyone have the correct answer. Thanks

[joe_padavano]

Originally Posted by jturbo7

I have a 66 GTO with a 454. I hear that the frame should be the same as a 66 Chevelle, but everytime I call around for Chevelle motor mounts they tell me they are not the same. Does anyone have the correct answer. Thanks

They are the same as far as the engine crossmember and motor mounts are concerned. Any differences are in the frame horn areas where the bumpers and core support attach and will not affect the motor mounts. Just tell them you have a Chevelle.

[jturbo7]

Thanks for the help Joe

[bigdog7373]

Motor mounts should be the same no matter what car they're in.

[406 bug]

Originally Posted by jturbo7

I have a 66 GTO with a 454. I hear that the frame should be the same as a 66 Chevelle, but everytime I call around for Chevelle motor mounts they tell me they are not the same. Does anyone have the correct answer. Thanks

Maybe part of the confusion is the 454 in a 66. Ask for the 396/427 mount for the 66 Chevelle, since these were the bb's in 66. Just a thought.

[Bryan59EC]

Only big difference between a Pontiac frame and the Chevrolet frame is the length of the frame rails behind the rear axle-----the Pontiac is a bit longer.

The Pontiac frame is essentially a Chevelle Wagon frame or a ElCamino frame without the extra boxing on the side rails.

(Lemans to Chevelle, 64-67)

[MARTINSR]

Are you sure Bryan? I have had a number of 65 Skylarks and know them pretty well and have always been under the impression that ALL "A" body frames where the same within the same group like 66-67 Other than wagons, el caminos and convertibles (and a few freaks the the Gran Sports with boxed convertible frames even when a HT) were identical. I have never heard a single thing saying other wise. A 66 GTO, Chevelle, Skylark or Tempast would innerchange without so much as a bolt being out of place.

Brian

[redsdad]

The motor mount brackets which are bolted to the crossmember are different. The Chevy motor mounts are further forward on the block than the Pontiac mounts. You have to have Chevelle brackets on your crossmember or the engine will be in the firewall. The Chevelle brackets will bolt right on the GTO crossmember. Assuming you have the Chevelle brackets, all you need are the 66 Chevelle 396 motor mounts for your 454. The parts store guy doesn't need to know you have Poncho sheet metal surrounding it.

[Bryan59EC]

Brian

I will double check this today

There is a 66 GTO in the body shop now, just a few feet from my elky.

[Bryan59EC]

Brian

From the body mount just aft of the rear wheel to the rear of the frame, is approx 32" on both the Lemans/GTO and my ElCamino.

The Pontiac frame even has the holes in the frame to mount the ElCamino fuel tank----The ElCamino tank is strapped to a couple of brackets and then mounted to the frame. Passenger cars have the tank strapped to the body.

You might want to check the Buick when you get home today. You will probably get a 29" measurement or thereabouts.

This would be just for the 64-67 cars.

Bryan

[MARTINSR]

Thank you Bryan, that is very well explained and interesting as all get out. I have never known that and thought I knew a lot about A bodies.

Thanks again, Brian

[Hippie]

I've seen the Pontiac frame brackets used for the Chevy swap by relocating them for the Chevy motor mounts. It's not as clean as using the correct brackets, IIRC they hang over one edge of the K member slightly. It's been a couple decades or so.......

Back in the 70's the guy I bought my '67 GTO from had a '66 El Camino with the front clip from a SS396 Chevelle and the complete drivetrain from a rolled '67 GTO in it. It also had the complete dash, seats, floor shifter, console and door panels from the GTO. He said it was a total bolt in, no drilling or cutting anywhere except for the inner bolt holes on the bucket seats, shifter and console. It upset some of the Chevelle guys but once they found out it was originally a Plain Jane 6 banger and PG they got over it. He used it to tow his '65 GTO bracket car which it did quite well. The "El Poncho" saw an occasional run down the strip too and ran low 14's.

[V8&4spd]

The 3 holes in the frame are in the same spot for either Chevy or Pontiac. You need the bracket that bolts to the frame for the engine you are using. You can buy the motor mounts from Autozone, they show them online. The Chevy mounts are 1/2 the price of the Pontiac mounts.