Crank bolt pattern

[Bob Stoeger]

Hi,
Would anyone have or know where to find the crankshaft to flywheel bolt pattern, its a 6 bolt pattern but its not symmetrical and I need to modify my flywheel to fit. Any help would be appreciated .
Thanks,
Bob

 

[Wayne M.]

Bob
We need to have some more info like type of engine.

wm

 

[Kevin Box]

Bob

I have seen it in the SVO Parts books but not sure which one.
5 of the 6 bolts are equal spacing and the last is offset.
I have a drawing of it some where.
All of the 6 bolt SBFs are the same.
If you are doing it on mill with DRO the just borrow someones flex plate and plot it out

regards
Kevin B

 

[Bob Stoeger]

Opps,
I guess that would be good to know, sorry its a 302 ford small block.
Thanks,
Bob

 

[Wally]

HI Bob Be carefull with this as these Flywheels have counter weights in them ( some 28 oz some 50 oz ) Here is the bolt pattern

6 holes to suit 7/16" bolts on 3" PCD ---One hole at 64 deg (ie 60,60,60,60,56,64 ) approx. opp the counterweight looking from the clutch side of the flywheel.

Hope this helps as these if wrong will viberate your teeth out, Along with your engine bearings ECT. Wally

 

[John P]

The offset bolt hole is so the flywheel can only be installed on the crank shaft one way, so the counterweight is in the correct position.

 

[Bob Stoeger]

Wally and John,
Thanks for the info, and the bolt pattern worked great, check out the template, then check out my build thread for the final ressults.
Thanks ,
Bob

 

[Wayne M.]

I have the same info as Wally on the bolt layout all but one equally spaced on a 3" circle. That one has a 4deg shift. I just dont have the exact relationship between the offset bolt and the counterweight. It appears to be opposit the counterweight but how close to exactly opposit.

 

[Rick]

Sounds like trouble if it's not zero balanced (??)