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Post Info TOPIC: 1976-79 Pontiac 400 flywheel with 2.5" register ?


Poncho Master!

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1976-79 Pontiac 400 flywheel with 2.5" register ?


Is this what it looks like ? Anybody has one to compare, maybe this one is an aftermarket ? No part# or date on it.



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A Poncho Legend!

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IMG_2586.JPGIMG_2585.JPG



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Canadian Poncho Superstar!

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I'll dig in the shed tommorrow to measure one..



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later...rog

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I'm a collector...not a builder!!Located in sunny central Saskatchewan at the lakehead!


Poncho Master!

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Thanks Roger, see if it looks like mine too ?



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Poncho Master!

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Still trying to figure out this flywheel ??? Anyone ever seen one of these ? My 1972 400 crank attaching bolts don't even fit these holes ... Maybe 301  ?



-- Edited by pontorquer on Thursday 17th of April 2014 10:05:02 PM

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Uber Guru

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I think the 2.5 hole is for Pontiacs from 76 or 77 and up. Below that should be 2.75.  

 

Just checked my 76 400 crank and it is a 2.5. So 76 and up for sure.

 

Ian



 



-- Edited by Beaumont4008 on Thursday 17th of April 2014 10:37:43 PM

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Canadian Poncho Superstar!

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Everything I measured is 2.75.  .  No dowel pin in yours...so it's not chevy?

 



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later...rog

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I'm a collector...not a builder!!Located in sunny central Saskatchewan at the lakehead!


Canadian Poncho Superstar!

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That drilled cast out recess is odd?   No chance this is for a 301?



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later...rog

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I'm a collector...not a builder!!Located in sunny central Saskatchewan at the lakehead!


Poncho Master!

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Mystery solved ! I found out this is an Oldsmobile flywheel with the 7/16" crank holes :0 ...  Thank you all !



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Member

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I think you need to double check your flywheel, as ALL Pontiac flywheels from 76-81 weather it be a 301 or A 400 has the smaller register bore as the end of the crank on the later engines were cut smaller to. The flywheels with the larger register bores are for the 75 & eairlier engines. If you have a flwheel with the small register bore you can have a quality machine shop open it up to the larger bore but make sure it's a quilaty shop because it need to run true. Also always check when you are looking at Pontiac cranks that they are drilled at the end to except a piolet bearing, some of the Pontiac cranks didn't get bored out in the end to be able to use them for a stick trans. Not all the cranks got bored for that. Most of the cranks that didn;t get bored or the ones that have the bigger chance of not being bored were the early 70's cranks. It was a cost savings thing.

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