[SSSammy]

Fwiw ... my KC482, mild hyd roller cam, Stage II heads, 750 cfm Holley 4150, was originally built by Keith in 2007 and then tuned by Rob in Plano. It ran 571 HP on Keith's engine dyno and 422 HP on Rob's chassis dyno in 2007. Then in 2008, it was rebuilt by Keith after a rocker shaft failure at Run N Gun, and it dynoed 566 HP at Keith's and 418 HP at Rob's.

So it could be some combination of parasitic losses, plus some variation in how the dynos are calibrated. The car has ERA headers and side pipes, McLeod Al Flywheel, 12" McLeod PP and disc, Tremec 600, and Jag style IRS.

Sam