flexplate crank bolt pattern problem

C

catfish man

New Member

Jun 1, 2021

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MS

Jun 1, 2021

#1

• Jun 1, 2021

• #1

I have a question is there a different crank bolt pattern for the 28 ounce flexplate than the 50 ounce flexplate ? just purchased a late model 302 and the 157 tooth flexplate with the 50 ounce weight does not line up on any pattern . Plus the crank has 6 threaded holes and one blank hole like would be used for a dowel . any ideas ? Maybe someone knows what flexplate will fit and will the balance be right ?

 

90sickfox

Wasn't a pretty sight...and I've got big hands

SN Certified Technician

Mar 2, 2015

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Jun 1, 2021

#2

• Jun 1, 2021

• #2

Did you spin the flywheel to all 6 possible positions on the crank ? It only bolts on one way. The 50 and 28oz flywheel bolt pattern is the same.

 

C

catfish man

New Member

Jun 1, 2021

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Jun 1, 2021

#3

• Jun 1, 2021

• #3

90sickfox said:

Did you spin the flywheel to all 6 possible positions on the crank ? It only bolts on one way. The 50 and 28oz flywheel bolt pattern is the same.

Click to expand...

yes , i put an index mark and tried each way twice . also got another new flexplate just incase boxed wrong . seems like this crank is for an older style . did early model cranks have a different bolt pattern ? measured between bolts and spacing is not the same

 

90sickfox

Wasn't a pretty sight...and I've got big hands

SN Certified Technician

Mar 2, 2015

6,945

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Jun 1, 2021

#4

• Jun 1, 2021

• #4

I had a 289 in one of my cars but can't remember if the bolt pattern was the same.

 

C

catfish man

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Jun 1, 2021

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Jun 1, 2021

#5

• Jun 1, 2021

• #5

i figure someone besides me has run into this before . Its a new Crate engine 302 late model but got to be something going on with this crank . Also why the dowel hole ?

 

Justin87

5 Year Member

Aug 7, 2017

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Jun 1, 2021

#6

• Jun 1, 2021

• #6

catfish man said:

I have a question is there a different crank bolt pattern for the 28 ounce flexplate than the 50 ounce flexplate ? just purchased a late model 302 and the 157 tooth flexplate with the 50 ounce weight does not line up on any pattern . Plus the crank has 6 threaded holes and one blank hole like would be used for a dowel . any ideas ? Maybe someone knows what flexplate will fit and will the balance be right ?

Click to expand...

I have a 50oz flex plate on my DSS motor, and I found it extremely tight fitting to the crank holes.

These guys are correct tho, it only bolts on one way.

I went around each hole in the plate lightly with a deburing tool, just incase that was hanging up on the bolts. I was able to get each bolt started in its hole and turned each thread little by little in a cross pattern.

Eventually it got easier and just went in and torqued up fine.