Switching to Crate Class 604/602 witch one???
I'll be running (30 years driving experience in Street Stocks, Sportsman and a limited LM) in the Crate Class next season just wanting to know is the 150# weight break with a 602 (the track I run at gives this) worth the savings on price of a 604 motor or should I just get a 604 motor (the car i'm looking at has a 602). I have been told that the 604 has a big HP advantage vs the 602. Also does the motor as it comes from GM need the upgraded valve springs or are they already on it, like I said I'm new to this Crate deal.