[quote=“eurodad,post:6,topic:27570"”]
503>305
[/quote]
maybe in a manual car, but not in a stock auto LT1. the 503’s powerband doesnt kickin until 1800rpm, where as the 305 hits at 1500. If you have an auto, with a stock TC, the 305 hits right where you stall at. other than that and the 4deg seperation in duration they are exactly the same