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81 Cadillac Seville
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15 Posts
Discussion Starter #1
i've read about swapping out a 368 for a 500. if you do that does the transmission line up? or do you need the transmission that goes with the 500?
thanks
Jon
 

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'80 Fleetwood Coupe, 1994 and 1995 Mercedes 140 Coupe
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2,096 Posts
368 425 472 and 500 all share the same bellhousing and flywheel boltpattern. All are internally balanced so flywheels (flexplates) interchange. Same for starter motors. Bellhousing is known as "B.O.P." for Buke Olds Pontiac. Some old timers call it the Mae West pattern.
 

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i have a 81 coupe with a 4.1 V6 i like to swap it out
for a big block caddy motor 472-500-425.
is this easy or would small block chevy be easier?
what gm thinking putting a V6 in this big of car.
 

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95 FWB 81SDV 96 FWB 94 Fleetwood
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1,513 Posts
You can bolt in a 472-500, with no problems... I would not put in a 425...If you and find a 77-79 donor car, all the parts for the swap are on that car..motor mounts,exhaust, transmission and crossmember.. you could use the transmission thats in there , but you will blow that fast with a big motor.. The th400 will last...and use the donnor car driveshaft...The rear end in the V6 car is a 8 3/4", that is OK strong,caddy only rear, and it is 3.08 or 3.23 ratio.so with a big motor it will really fly... the more I think about it I think its a 3.23... I would have to check my book for sure....
 

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thanks for the info my dad brought the car new with this motor
and i kept in good shape no winter driving just very under powered.
the air and all that can bolt up from the donor car? any wireing differances?
 

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95 FWB 81SDV 96 FWB 94 Fleetwood
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If you want to use the same compressor for the air, you will need the bracket from a 1980-81 368 motor...you should not have much of any problems with the wiring...
 
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