I am looking for someone who is running with some Dart Pro 1 heads on a 350 to inform me of any spring rate changes they may have made. My set up consists of a 224/224 489/490 hydraulic lift cam w/12psi blower and forged internals. I currently have the hydraulic springs Dart supplied me with the heads. I am just tring to prevent any problems from happening with the new upgrades. Thanks, guys

 

Probably be easier to contact Dart and ask them about the spring rates they supply. Chances are the springs are produced by Comp, Crane etc. and they can give you exact specs for them.

Mike

 

Well the thing is i dont even know what springs rates i need. How do i figure this out?

 

Contact the cam manufacture for the required spring rates. I'm assuming that is a hydraulic roller cam?

Mike

 

No, it is a hydraulic flat tappet. Thanks for the info.