Correct flex plate for my 231 V6?

I have a Buick 231 odd fire V6 and TH400 that came with a jeep I no longer have. I want to install it in my CJ6 project. The flex plate that was bolted to the motor has 168 teeth. Does that sound correct for the 231? What type of starter will it have to look for, for this motor? If this flex plate works, I'm ready to order the transmission to transfercase adapter and install them to my project.

 

I thought the tooth count on my 231 flywheel was 160 teeth.

 

I really need some help on this. I dont' want to invest in the Advanced Adaptor's stuff if I can't marry the transmission to my engine.

 

Jeeps came with turbo 400s and 20 tc. No need to spend money on a AA adapter when you can find trans tc combos with the adapter pretty easy for a couple hundred bucks or less. I can count a flexplate tomorrow for you.

 

Thanks Daryl, I am using a YJ frame and I like the idea of the rest of the drivetrain to be YJ for suspension upgrades and so forth.

 

I just ordered what I hope is the correct flexplate for my 231 v6. I ordered a flexplate for a Jeep comando fitted with a 225 v6 and th400 transmission. We'll see if it works.

 

Well, the flexplate I ordered from Rock Auto came today and it is the same as the one I had, 168 teeth.

 

Both flexplate to not align with all the holes in the crankshaft end. I'm wondering if maybe my motor is not what I was told. Is it possible it is an even fire out of a later model Buick?



Can anyone tell if this is an even fire or odd fire from this picture?

 

I've taken some pictures of my flexplate and the crankshaft end. The crankshaft end pictures are not very good, but hopefully someone can tell what they are looking at.







The above pictures were taken with the engine on its stand, so I can't get a straight shot at the end of the crank.



Thanks for looking.

 

Look at the number on the top of the block just behind the intake and google v-6 buick casting numbers. They used to be here in the tech section, but I just looked and didnt see them.

 

Casting Numbers

 

Thanks all for the help. My block casting number is 1249432, which translates to a 1975-1976 block and it is an odd fire. So now I need to look up the proper flexplate for that year motor.

 

What was the part number of the flex plate you ordered?

 

The part # was 16913.08. I ordered for a 71 jeep commando 3.7 L (225 cid) thinking it would be close to what I have. Now that I have actually looked up the block casting number, I find that the engine is a 1975-76. I reordered from Rockauto. The picture they show, for what it's worth, looks different from the one I have.
I just noticed something else tonight about the crankshaft flange, it has a V notch in the side of it. I suppose that might have something to do with locating a balanced flywheel?
The picture of the latest Rockauto flexplate I ordered shows the bolt holes looking like the bolt holes on my crankshaft.

 

Not exactly sure what the notch is there for but it's not for locating the flywheel. The mounting holes are offset so the flex plate or flywheel if it's a standard will only go on one way.
So you're saying you've already ordered another flex plate? I've never been able to find a listing for a Jeepster flex plate on RA.

 

The flex plate or flywheel will physically bolt up to a 225, 231 odd fire, and even fire 231/252. If the one you received will not bolt up it is completely wrong. The difference is in the balance of each one. The v notch in the crank has to do with how the odd fire 231 was balanced. They also used a different harmonic balancer than a 225 or even fire 231/252. You can put a 225 flex plate on an oddfire 231 and vice verse because the balance is pretty close. Not so with an evenfire flex plate or flywheel. You can have the even fire parts balanced to the oddfire and vice verse. Any Competent machine shop that balances engines should be able to do this.

 

Heavy 1967 225 flywheel bolted right up to 1985 231 turbo crank so I think the opposite should be true also. AM

 

The flexplate I ordered from Rockauto arrived and it fits, all the holes line up with the holes on the 231's crank. I counted the teeth and there are 160. This sounds better than the 168 teeth I was counting of the other two flexplates I had. I hope all the other concerns of the flexplate work as well, (torque converter, starter?).

 

Mike:

I am looking for a flex plat for my 225. What was the correct part number that you came up with.


Hank