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Pontiac of the Month

Debbie Harris's 1969 Grand Prix

2021 October
of the Month

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Dang! Gotta hate those speed bumps in the road. Turns out my newly purchased 1962 rebuilt 389 has a little smaller crankshaft hole. This will not mate up to my transmission. Options are to get crankshaft machined or find a new converter plate with smaller pilot hole. Talked to engine seller who was surprised to learn about different size crank holes. He has a 64 389 in stock he will rebuild and swap with the 62 engine. With my original engine out I inspected the timing chain which is really loose. I think this was why I couldn’t get timing correct. So…. For the moment I will replace chain and drop original 389 back into car. Hoping I can get back on the road during the rebuild wait.

2DEB1743-CF69-4CBB-95FB-90ABAACFE232.jpeg

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Wait what???  Your starter is on the bellhousing with the 62?

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wow! thats very interesting !!. justA nother little bump in the road Del !🙄

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Posted (edited)

Apparently they made a change in the crankshaft hole diameter with 62 vs 64. The 64 hole is bigger. Apparently they made converter plates to match up but… first is how to find one and second is transmission needs to be pulled to install different plate on. Also you would need a new ring seal. Bellhousing is the same for both.

Edited by Bonneville convertable64
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1 hour ago, Bonneville convertable64 said:

Apparently they made a change in the crankshaft hole diameter with 62 vs 64. The 64 hole is bigger. Apparently they made converter plates to match up but… first is how to find one and second is transition needs to be pulled to install different plate on. Also you would need a new ring seal. Bellhousing is the same for both.

I have a 64 -421. 64 was the 1st year they attached the starter to the block instead of the trans/bellhousing.  I'm running an auto trans but anything 63 back is stuck with the 2spd glide, or the stick.  Sure looks like an automatic trans in your picture.  Is that trans a 64 or is the trans a 62 to match the motor your installing.  

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Great pictures Del 👍

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Nice pic's.  Up here in the mitten we are trying to get in our last couple of shows before the rides are put away for the winter.  You get to play year round.

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Posted (edited)

I know what you mean JUSTA6 being from Ohio. Just moved down here for good a few yers ago. I also work on pinball restoration and I absolutely love being able to solder, paint, sand, bondo, glue, and everything you can imagine all year long.

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Edited by Bonneville convertable64
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Very cool.  My son and family is in FLA.   Make plans to attend the Turkey trot in Daytona in November.  Will blow your mind.  Biggest carshow/swap meet I've been to.  In the infield of the track.  

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