I've got a 2002 107" S&S that came off of a Big Dog.. I've heard that they de-tune the motors slightly with the cam and sometimes carb. I want to know how to tell what kind of cam I've got now.. May want to upgrade to .600..
Thanks,
Nate

 

Since Big Dog has gone to that great custom motorcycle burial ground, call S&S and get it from the horse's mouth. Also ask about what lift the heads will accommodate before buying cams with .600" lift.

 

You may be able to pull the cam cover and look for any markings on the end of the cams? If the motor is out, that would be an easy thing to do. Also, I wouldn't just arbitrarily change to .600 either without knowing more about your heads and CR, etc.

 

the marking would be on the bearing side (Inner),if you don't want to pull the cam cover & check.pull a p/rod,get the lifter on the base of that lobe and with a indicator,check the lift.take what ever you come up with & multiply it by 1.625,you`ll have your cam lift.now this still wont tell you what is the max the heads are set up for.since your wanting to go with a bigger cam,your going to need more compression too (big dogs were way down on that too),your better off just pulling it apart,seeing what you've got and plan a build

 

Isn't there a way to put a degree wheel on the crank to see when the dial indicator shows the opening and closing of both the intake and exhaust in degrees to make it easier to match cams. I mean you would have Lift and be able to calculate duration and overlap by the opening and closing points in degrees and along with doing a ccp one should be able to match spec's, wouldn't they?

 

the way I said was just to find the lift of the cam,to actually degree it with a wheel to get all the specs would be WAY easier just to pull the cam (IMO,it would be easier than even checking for lift just to pull the cam),not a big deal