Important if you run D-H/S or SA

[dartman]

Originally Posted by Greg Hill

If you don't think they turn a bunch more rpm than they did 20 years you must of been sleeping this whole time. It's amazing what tons of spring pressure, roller rockers, and new cam lobe designs will do.

x2

BTW The track where the d/sa record was set is a very very fast track.I was the next car down the track and was -1 plus under.He did everything right including,the combo, the day,the track, the weather and traction was the best I've seen any where.

you should be happy for them.