Crankshaft offset gear keyway

[malex]

I have never seen this before. The crank gear keyway is indexed about 90 degrees from the balancer keyway. The crank is a billet stroker crank with the 8-bolt design and dual keyways on the front. Does anyone know the reason for this?

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The balancer keyway is correct and the balancer matches the timing tab for tdc. The degree wheel was the only way to get it right.

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at 106 centreline.

 

[silversedan]

looks like its got two large keyways, that's usually for blower applications .

 

[malex]

looks like its got two large keyways, that's usually for blower applications .

Yes you are correct. I have researched that is what it's for. The balancer keyway is 1/4" as well. I cannot understand the reason to offset the crank gear key like that. The new comp timing gear 3-bolt set's timing marks couldn't be used for the crank gear. In the last picture you'll see that the crank gear dot ended up being at the 9 o'clock position once it was degreed properly @ 106. There is actually a 2nd crank gear keyway @ 180 degrees from it too. Strange.. I'm certain others have encountered this. ??

 

[silversedan]

most blower motors don't use balancers and they probably had a gear drive on also so you wouldn't have to line up dots like on a timing chain.

 

[malex]

most blower motors don't use balancers and they probably had a gear drive on also so you wouldn't have to line up dots like on a timing chain.

Just have to line up the gear drive markings then with a set that is for an indexed keyway @ .090 off stock.
Thank you.