[Hit Man]

I purchased a stroker motor, while I was mad at my turbo kit, for my busa. The motor was a package deal and came with a head claimed to be from Carpenter with a set of his cams to match. How do I measure the lift on the lobes to find the exact lift? Should I mic. the whole lobe from tdc to bdc and subtract half of the base circle, or measure the lobe lift off of the top of the cam and multiply it by a certain number? What is the base circle on a stock busa cam?
The crank is a Marine unit, but the guy I bought it from didn't know if it was a 5mm or a 6mm over stroke. Does Marine stamp anything on their cranks?

 

[Hit Man]

OK, I found the 5mm stamp on the crank.

 

[srmotorman]

use a dial indicator to find indicated tdc. I have a long travel dial that will actually travel the full length of the stroke on most of these size motors. I just subtract out the difference and that's your stroke.

If you've never degreed a set of cams, I suggest you grab a beer, some dial indicators, a degree wheel and build up some patience. The first time can be aggravating. you might as well check out this link, it's a great reference bed!

ISKY Racing Cams.

 

[gazx10]

lift

simply set up a dial indicator zeroed on the bucket at bucket angle, turn engine to full lift on that bucket, measure and add valve lash.