How much is too much

[forever4]

Originally Posted by Dick Steinkamp

Not so. The base circle (heal) is reduced in order to have enough "new" material on the other end to grind the stock profile. Here's a good thread on that...

http://www.jalopyjournal.com/forum/t...am-work.36558/

You do have to make up the difference in the slightly shorter total cam lobe. Usually done with adjustable lifters/rockers. With a stock model a valve train you would need new valves so that you have long enough stems to obtain the proper clearance.

I think Tom and George are the only guys on this thread who understands the facts and is correct.

You cannot regrind the cam and get the original lift and duration back back. People make the mistake of thinking it is a simple lift geometry problem. It is not, and it has nothing to do with making the push rods longer.

The cam profile plot of lift versus angle duration represents the time and opening of the valve, which affects the amount of air fuel mixture entering the cylinder. This is directly related to the power capable of being produced. If you integrate the area under the curve, it is profoundly different (less) for a reground cam.

Depending on the regrind, you can bias the torque and power a little, but overall you are at a loss compared to stock.

Many people here seem incapable of grasping this, or unwilling to believe it.

and so it goes...