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Old 10-21-2010, 09:23 PM
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77 catalina engine swap

I have a 1977 pontiac catalina witha 301, and i want to put a chevy 350 in. Should i but a different trans to bolt up to the 350 or will my pontiac trans bolts up? will a chevy trans fit into my transmission mounts?

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Old 10-21-2010, 09:26 PM
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They make transmission adapter plates. Your frame should already have the holes in it for the Chevy engine mounts.
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Old 10-21-2010, 09:46 PM
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When I was A kid I had a 301 in my 79 regal and I loved it!! They don't make squat for a 301 so I can see wanting to go to the 350. V8&4spd is right... The 350 should bolt right in!!
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Old 10-22-2010, 12:05 AM
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General Motors had two transmission bolt patterns (at least with what we commonly discuss here)

Chevy had its own pattern. All Buick, Olds, Pontiac, and Cadillac shared the same pattern - different from the chevy.

That is why you'll often see transmissions advertised as "chevy" or "BOP"

If you're putting a chevy engine in place of a Pontiac 301, you'll either need to pony up for an adapter kit, or buy a chevy version of the same transmission you have now.
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Old 10-22-2010, 07:27 AM
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Go pontiac

The 301 is a low deck height pre-corporate pontiac. If you run a 326-455 pontiac instead of the chevy. I believe your engine mounts and I know your tranny will bolt right up i would go that rout. Then it would stay all Poncho
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Old 10-22-2010, 09:38 PM
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THIS is an adapter to use your BOP trans behind a Chevy engine.

TCI Adapter Instructions PDF
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Old 10-22-2010, 09:46 PM
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Quote:
Originally Posted by Onefunponcho
The 301 is a low deck height pre-corporate pontiac. If you run a 326-455 pontiac instead of the chevy. I believe your engine mounts and I know your tranny will bolt right up i would go that rout. Then it would stay all Poncho
Agree, nothing against Chevy's but that low end torque of a Pontiac is addictive.
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Old 10-22-2010, 10:07 PM
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A Pontiac 400 or 455 will cost more than a 77 Catalina is worth. The Chevy 350 will be like a set of rocket boosters compared to the 301.
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Old 10-22-2010, 10:53 PM
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Quote:
Originally Posted by V8&4spd
A Pontiac 400 or 455 will cost more than a 77 Catalina is worth. The Chevy 350 will be like a set of rocket boosters compared to the 301.
Just about any combo he decides maybe worth more than the car but...his call. I personally think this warmed over 406 Pontiac would make a excellent Catalina motivator apparatus, then again the vortec headed 4 bolt 350 behind it would persuade it nicely as well.
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Old 10-23-2010, 09:15 AM
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at one time, I had the chance to buy a '78 Olds Cutlass cruiser custom ( loaded 4dr wagon ). that was pretty nice for $400. had a 307 in it, but the owner also had a 455 he was willing to sell with it for another $500, or $700 installed ( shop owner ).. some work to that 455 and the car would have been 1 quick grocery getter.. passed on it tho.. but it would have been a sweet car for $1,100
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