I'm thinking about buying a moroso hei curve kit 72300. The instructions online outline the curve but it is done in crank degrees? Is that the same as advance. For ex with medium springs it says at 1500rpms there will be 4 crank degrees. Is that the same as 4 degrees of advance.

I just picked up a curve kit and also was woundering about the specs on the package. I think I'll just install the suppied weights and pick a set of springs then check it with my timing light to see what I end up with. Dave

Yes; that means 4 degrees of advance.

It doesn't tell which color springs are are for what what? I'm assuming the thickness of the spring wire will tell you which one is light, medium or heavy?

Or, you can just tug lightly on them; it's pretty obvious actually.

Sometimes timing is given in distributor degrees. Since the crank swings 360 twice for every 360 of the distributor, crank degrees are twice that of the distributor ( and crank degrees is what is normally used ). E.g., I was told there is 9.5 degrees of mechanical advance in the distributor, which translate to 19 crank degrees.

BTW, I know not of that exact kit, but with many of those kits the lightest springs are much too light. To the point of when used with stock weights, the advance is 'on' at idle rpms. Start heavy and work down imho.

Originally posted by 427L88:
... Start heavy and work down... graemlins/thumbsup.gif