I need a new flexplate for a 66-67 E Block and have purchased two new ones that do not fit. Am I missing something or are these really this hard to come by? The block has the original crank as far as i know. Each of the two linked below do not line up correctly on the bolt holes. Both are 166 tooth, and I think 13.91 in diameter, but the bolts still don't line up. I am facing the weight toward the transmission as I believe it should be. The ATI flexplate has a sticker that says to put the weight towards the motor, so I am starting to question my very existence at this point, lol. Are there any aftermarket options or do I need a used original? Any advice would be greatly appreciated as I am at my wits end. Thanks in advance. Matt

ATI Performance Products ATI915563 ATI SFI Flexplates | Summit Racing

Pioneer Cables FRA-102 | Partsgeek.com

 

The Pioneer FRA-102 is for '68 and later Olds according to their website. The ATI915563 should fit by part #, it could be labeled incorrectly. Do both flexplates not fit in the same way? Perhaps they are labeled wrong. Try turning them around, the weights could be on the wrong side from assembly.

 

I am pretty sure I have a FRA102 at the shop. I can look at it on Monday.

 

What is the part # on the crank?

 

Just to double check, are you rotating the flexplate around the end of the crank? The bolt holes are not symmetrical and there is only one place that they all line up. John

 

Double check its been awhile, but I believe the 330 flex plate will work too? In case you run out of options.

 

I believe this is correct 330, 400E, and 425 will work if the crankshaft is an original/64-67. This excludes the 1964 394 CID.

 

Thanks for all the replies gents. I am doing some refitting and taking notes on the 2 i have. The ATI one has a much smaller weight than stock and the FRA102 seems to be for 68 and up. I think both have the 68 up bolt pattern so are not fitting my crank. I can't confirm crank part number but i can confirm it is forged due to the "L" cut in the rear flange so it would be 64 to 67 as far as i know and is likely original to the block.

I am seeing many aftermarket manufactures out there saying the weight goes toward the engine but Oldsmobile goes toward the transmission correct? I know the one on my 67 is this way. Chevy goes toward motor if memory serves. The good news is this is a spare motor so I am still mobile and not in a huge rush to get this but sure has been frustrating thus far. I will report back closer observations between the two.

 

Thanks Sugar Bear for the confirmation! At this age my memory is still good just getting shorter!!!

 

Just learned this: "Yes, the weight placement on the ATI 915563 flexplate is intentionally different from a stock Oldsmobile flexplate. The ATI part moves the counterweight to the engine side to provide better clearance for some aftermarket torque converters. " So now another test fit. TBD.

 

All 1964-67 330, 400 (B and E), and 425s use the same crank flange bolt pattern. The 400s and 425s use the exact same crank forging.

 

After learning the ATI 915563 flexplate intentionally moved the weight to the opposite side from stock it turns out that it fits! I tested the converter bolt alignment as well and its good. Final test will be to put a starter on and crank it. My intention is to do a compression test just to get an idea of the state of this used motor before tearing into it. I really appreciate everyone's input and at least I found there is an aftermarket flexplate for the 64-67 motors. Granted 250 is not cheap but it is made in USA and seems to be a bit tougher than stock.


This is the flexplate I am currently running on my 67 with E Block for reference.



ATI 915563 flexplate showing bolt alignment, notice weight is not visible since it's on engine side.



12in ST300 switch pitch torque converter, or any standard TH400 converter bolts align to ATI 915563 flexplate.

 

I paid $330 for an early pattern flywheel 10yrs ago. You want cheap? Build an LS LOL

 

Is this just a terminology difference, or an apples-to-oranges comparison?

 

^^^THIS.
you have to really be sure that you’re checking every location.

and yes, the weights go away from the engine and face the torque converter.
this makes getting new torque converters a little tricky sometimes too.

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It was more of a price comparison flexplate to flywheel. $250 seems really high, and it should have an SFI sticker at that price. Flywheels carry more material requiring more machining, thus more money.

 

I agree that $250 is high but i could not find any other options. But to your point, is does have the SFI sticker on the other side.

 

It definitely looks beefy!