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Tribal Scout

2 Posts

Posted - 12 Jan 2016 :  5:57:35 PM  Show Profile  Reply with Quote
Iam an old Pontiac owner since 1968.I just bought a1983 bonny wagonIt came from florida .iT BARELY RUNS.IT MAY BE OLD GAS POOR CAB OR MANY OTHER REASONS.i AM NO LONGER ABLE TO DO THE WORK.iF WHEN I GET EVERYTHING SOLVED I have a bad 305 motor I want to swap a 455 in it.has this swap been done and how. thanks ahead of time

Sitting Duck

1531 Posts

Posted - 12 Jan 2016 :  6:06:06 PM  Show Profile  Reply with Quote
I think a couple guys here have done a similar swap. I would think motor mounts and transmission at least. Maybe they'll chime in.

71' GTO Original 400 M20 3.23 posi
13.95@102.1 MPH on street tires
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Blued and Painted

3505 Posts

Posted - 13 Jan 2016 :  12:40:38 AM  Show Profile  Reply with Quote
I would find a more appropriate body for the 455.

Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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The Great White Buffalo

7284 Posts

Posted - 13 Jan 2016 :  1:36:23 PM  Show Profile  Reply with Quote
Get some G-Body 301 mounts for the Pontiac swap. You'll need to figure out what trans is in the car. Should be a 200-4R or T-200. 200-4R should be uni-bell and bolt to Pontiac (BOP) as well as Chevy. That is easy to verify by looking at the shape of the top of the bell behind the block. If 200-4R, I recommend keeping it in place for now. You can have it upgraded/beefed a little later on if it is in good shape. Great trans for the street. Need to reuse the metric converter bolts to bolt up to the flexplate. Make sure you use a dual drilled Pontiac flexplate OR one drilled for a 350 convertor (smaller bolt circle) as the T-400 convertor bolt circle is too large.

Accessories are in different places and require Pontiac brackets. Hopefully your 455 is complete and you can reuse those items. Exhaust pipes will require modification naturally. Fuel pump is on opposite side so lines will require modification. Same for starter and alternator, they both need to be moved to opposite sides from current location which really isn't a big deal.

Radiator will need to be upgraded and possibly a different shroud depending on how your Chevy setup was done by the factory. I would expect it to be one of those 2bbl carbs currently? Assuming you'll be putting a Qjet or some other 4 bbl on it? Linkage is standard fare for a carb swap.

Pontiac Distributor is needed of course. Will probably need to swap out front springs for the heavier engine but I'd wait to see the final ride height as it may not be an issue. Also, if you are using aluminum intake, heads, water pump, mini starter and such that would offset the larger Pontiac engine weight.

Bowties are for Pee-wee Herman. LS swaps in Pontiacs should only apply to Fieros.

Edited by - Phil on 13 Jan 2016 1:39:26 PM
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Tribal Scout

2 Posts

Posted - 13 Jan 2016 :  4:09:16 PM  Show Profile  Reply with Quote
thanks so far.at this point I am not sure what is going to happen to this car but since it has been done before it could happen again mt\y last Pontiac I drove was a 1966gp with 455 and 3.08 posi.I put discs on the front from a70 bonny/ what a great cruiser!!
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