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Pontiac V8 Swaps

Old 01-16-2018, 05:44 PM
  #501  
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Car: 1988 Firebird
Engine: L03
Transmission: 700R4
Re: Pontiac V8 Swaps

The 700R4. Already have the adapter plate. My concern is the distance between the engine mounts so that I don't have to remove and relocate them. If I had that measurement I could make block mounts to fit so I don't have to mess with the frame. I did measure the mount-to-bellhousing on a spare Chevy block and the Pontiac. The Pontiac mounts are positioned a little bit farther back on the block, so the trans will actually be pulled forward a little bit.
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Old 01-16-2018, 09:57 PM
  #502  
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Engine: Turbo 301
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Re: Pontiac V8 Swaps

If the Pont. block mount is farther back, then that'll be beneficial with your bellhousing adapter. The adapter will push your motor farther forward, if you leave the tranny as is.
Just have to keep an eye on all your clearances on the frt of your motor, such as waterpump snout to radiator. I'm sure that 350 is a longer eng. than the chevy SBC. Imagine you'll probably go with a radiator with elect. fans?
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Old 01-16-2018, 11:47 PM
  #503  
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Engine: L03
Transmission: 700R4
Re: Pontiac V8 Swaps

The adapter is only 1/8" thick, so it won't make much difference. I think they are similar length, but the Poncho is definitely wider. The car came with electric fans, so yeah I'll be sticking with them. I am upgrading the radiator as well. I plan to figure a way to adapt the serpentine system also.
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Old 02-07-2018, 08:36 PM
  #504  
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Re: Pontiac V8 Swaps

I also plan on doing this swap soon. Bought a standard bore Pontiac 400 and have taken it apart to be machined. Plan is to stroke it to 461 and put a T56 behind it. Should be a killer combo when it's done. My main concern is the mounts, it seems like some things work and some don't but if I have to I'll just make my own.
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Old 03-02-2018, 12:31 PM
  #505  
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Engine: 305 tbi
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Re: Pontiac V8 Swaps

Just got another 3rd gen bird. Its already got a cowl inducted hood so i dont have to worry about clearance. Plan to swap in my 73 455 sometime in the next couple summers
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Old 03-02-2018, 12:53 PM
  #506  
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Re: Pontiac V8 Swaps

ooh cowl, need
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Old 03-02-2018, 01:23 PM
  #507  
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Re: Pontiac V8 Swaps

I was gonna do the conversion in my 89 trans am but had a hard time trying to keep it under the factory hood and i didnt want to alter the factory appearance of a trans am. This one i can mock up with the second gen motor mounts and drill the right holes into the subframe.
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Old 03-02-2018, 05:15 PM
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Re: Pontiac V8 Swaps

Oh my God JJ, you're still out there! I'ld say welcome back, but I haven't been partaking here much either. Congrats on your new acquisition.

Last edited by tajoe; 03-03-2018 at 06:07 AM.
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Old 03-03-2018, 05:56 AM
  #509  
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Re: Pontiac V8 Swaps

Thanks joe. Had a divorce. Had to sell a few cars. Been stockpiling since though. I got that 91 and also added a 69 chevy 396 truck to the collection.
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Old 10-04-2018, 05:25 AM
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Re: Pontiac V8 Swaps

HI all corect me if i am wrong in 82 when the 3rd gen wos about to be relesed .gm pulled the plug on the pontiac v8.and went corporate engine .the engine the car wos desined with wos the 301 turbo from the 81 gen 2 hence the cowl hood .so the pontiac engine should fit with little mods .
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Old 10-04-2018, 08:14 AM
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Re: Pontiac V8 Swaps

You must've seen the You Tube video titled "GM Quashed the 82 Turbo Trans Am", because most, if not all you mentioned is true. I've heard conflicting opinions about whether or not corporate intentionally used the hood bulge for "cosmetics", or if they in fact planned to put the 301T motor in it. None the less, it would be a unique automobile, and there is an extremely few people out there that have accomplished it. Not a lot of recognition for them.
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Old 10-04-2018, 10:09 AM
  #512  
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Re: Pontiac V8 Swaps

TAJOE i have a book with the turbo lump car in it all the original press relese wos of this car when thay went on sale .so the book says ! if the 301 t wos in the car then with bit of reserch the parts used probably lurking in a gm parts book sumwhear .im looking to put a 400 in my 88 formula .
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Old 10-04-2018, 11:04 AM
  #513  
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Re: Pontiac V8 Swaps

This thread has been around for sometime, and from the very beginning, there are very few members who have accomplished this swap, and even fewer that have posted pics, and given any real details. Page 10 has a few posters that show their stuff, and even the top of this page. I've yet to see a completed conversion tho, with details (pics) of mounts, exhausts, torque tube mods, and the final product in all it's glory. I'm guilty of the same scenario, because of lifes priorities, finances, and justifying time spent. It's extremely difficult to build a car, while raising a family with a conservative income. If you notice the dates of the posts in this thread, you'll see it goes way back, so be careful when looking for parts that are listed. Some of these companies are long gone.
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Old 10-04-2018, 05:34 PM
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Re: Pontiac V8 Swaps

TAJOE thanks im going to check out parts etc befor i start .thanks for the heads up
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Old 10-26-2018, 04:39 PM
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Re: Pontiac V8 Swaps

HI all me again duz anybody know of anybody who can supply engine mounts for the 400 swap had a good look on internet and found nothing
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Old 10-26-2018, 08:26 PM
  #516  
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Re: Pontiac V8 Swaps

I'm gunna go out on a limb here Bear, and state something that was told to me many years ago, and can't prove it on my end. It seems logical to me tho, and will be easy enuff to prove. The stock rubber clamshell mounts on the frame of the 3rd gen, will directly bolt to the stock 301, 301T motor mount brackets.. it's just that the stock 3rd gen mounts have to be relocated up and/or over on the frames crossmember. And there's a possibility that the frame already has the holes pre-drilled from the factory. But maybe this only applies to the 82 car(?). Some day I'll get under my 84, and measure the length of the rubber mount where the bolt passes thru it, and compare that distance to the steel brackets on my 81 301T motor. And I know you were asking about bolting the 400 to it, but I believe the later 2nd gen F-body motor mounts are the same as the 301 motors. Or should I say, the 301 block mounting holes, are positioned the same as the traditional 70s V-8 cars.
This is a link the entrepreneur that actually has accomplished this swap. Not sure if it's already been posted, but lets just call it a "refresher".


Last edited by tajoe; 01-01-2019 at 05:50 PM.
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Old 12-30-2018, 05:28 PM
  #517  
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Re: GM 350 into 83 firebird F body

I have a 83 firebird F body . I am trying to put a GM 350 with a T5 transmition. The transmition and rearend is out of a 1992 Iroc. Engine is in having problems with bellhousing and starter. Any ideas. This car had a mechanical clutch. The bellhousing I have is from the Iroc. Hydraulic clutch. I got the petals for a hydraulic clutch out of a 84 bird. All bolts up but the starter won’t fit.

I also need the Torsan bar that will work with the T5
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Old 12-30-2018, 07:50 PM
  #518  
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Re: Pontiac V8 Swaps

You're in the wrong thread. This is for swapping traditional Pontiac V8s into 3rd gens.
(I was under the impression that 83s were hyd. clutches. Only 82s had mechanical clutches.)
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