10% or 25% underdrive?
10% or 25% underdrive? So I'm going to do a cam swap here soon and an underdrive pulley is on the list of things to swap. Which one do I want 10% or 25%. The car is my DD if that makes a diff in the choice. Just for info I'm going to be using a 230's / 230's cam on a 112LSA and about .590 lift.
Go with a 25% - I don't think 10% is enough of a difference to be worth it.
I ran an ASP for years and recently switched to a March (both 25%) after the ASP fell apart. The March seems to be better built but I have only run it for about 6 months so I can't say for sure.
I DD mine, in Phoenix heat, without problems - it is a good mod.
Steve
I ran an ASP for years and recently switched to a March (both 25%) after the ASP fell apart. The March seems to be better built but I have only run it for about 6 months so I can't say for sure.
I DD mine, in Phoenix heat, without problems - it is a good mod.
Steve 
