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Well get a spring tester that you can use on the motor. What kind of motor? I'll post a picture of a spring tester if you tell me the motor and cam. Who's springs do have, part#?



Well, I have a 1969 340 with a Lunati Voodoo 60402 Cam, with the MP P4120249 valve springs already installed on (pretty much stock) 'X' heads. Just new valves and seats.

But I also have a new set of 73949's (in a kit) from Lunati on the shelf, that I've been considering going with.

I figured that if I took off the P4120249's and the height was way off, I'd probably swap in the new ones anywho...

Got any advice on what height I should be aiming at? I'm kinda thinking 1.65 with the new springs.

Tim...

"Robots building robots.... now that's just stupid!" - Will Smith in the movie "I, Robot".

'71 Demon (340/727)/'69 Charger (383/727)/'65 Barracuda (273-2V/904)/'66 Coronet (340/727)/'86 Dodge Aries (2.5L)/'78 Dodge Aspen (318-2V/904)