im in the middle of my hotcam install now. the old cam is out, and i am ready to install the new. i knew i had to shorten the dowel because i am sticking with my 94 opti style. my question is.... does the dowel have to be perfectly shaped?? i know the one from the factories is perfectly round. the new dowel also did NOT fit in the gear. so i ended up grinding down the sides in order for it to fit. is this ok?? i want to make sure i didnt mess anything up before i install it and put it back together! i would appreciate any help ASAP!!!! thanks a bunch!

 

I believe the dowel should be the same except for being a bit longer. I would measure the dowel pin on the stock cam and cut down the Hot Cam dowel to match.

 

If I remember correctly it needs to be .620" long.

 

Referencing OBDII optis, GM states the dowel is to be "extended .620" from end of camshaft" (2003 GMPP catalog pg. 80).

Referencing Dynatech opti install tech data "the drive dowel OD: .250" max"

I hope this info helps with your application.



As an additional comment, I just installed a DynaSpark opti and a new Comp Cam in my 97. DynaTech recommends that the dowel be no more than .605" so I ground down the long dowel on the cam to those measurements.

 

So when you say it did NOT fit you mean diameter wise? I was able to tap my pin in more to match the length of the stocker.