1975-1976 Buick 231 / 3.8L Odd Fire Engine

[V-6 engine]

Everywhere I read, people are suggesting to use a heavy flywheel with the 1975-1976 Buick 231 3.8L odd fire engine to get the engine to run smoother. If I were planning on using the 200-4R automatic trans with this engine, is there a particular flex plate that I should use? If yes, does anyone have a part number? Thank you for your support, Tommy.

[alec296]

i believe they where talking about a manual trans
ussally for jeep swaps and mostly 225 odd fires since they did have 2 different weight flywheels but i beleive they swap to 75-76 engine
ta might have something

[V-6 engine]

I have been doing a lot of research. I do have confirmation that the 200-4R trans will bolt to a 1966 Buick 225 odd fire engine. What I need to know now is, if the crankshaft Harmonic Damper from the 1966 Buick odd fire V-6 will fit the Buick 3.8 V-6 engines, or if they are the same? Does anyone know, what other years it will fit? The reason I ask is because I plan on running a higher amp alternator, ac compresser, and power steering pump. Finding the right combination which will allow all the pulleys to align, will take a lot of research and time. If anyone knows what that combination is, that will be a great help. Thank you, Tommy.

[alec296]

it will fit but the balance is different ,you would need to rebalance the whole engine
you just need the pulley to run that stuff ,not the balancer

[alec296]

just get the pulley combo off one vehicle so they all match then use the waterpump for that year v6 also-
oddfires can have a short pump

[V-6 engine]

Yes, thank you for your support and thoughts, Tommy.

[tonibikezr1]

Yes, the flywheel and harmonic damper of a 225 V6 odd-fire and 231 V6 odd-fire (1975-1977.1/2) will interchange.

Flywheels/harmonic balancer
The flywheel and harmonic balancer of a 225 and Odd Fire 231 will interchange. A heavier 225 flywheel can be used on an Even Fire 231 if it is balanced with the crank.


This valuable information and more about 225 and 231 odd-fire on the following webs:

earlycj5 and novak-adapt