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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: thachevythang on February 23, 2011, 01:55:25 am

Title: Valve spring question
Post by: thachevythang on February 23, 2011, 01:55:25 am

Surely a newbie question but trying to get all the right parts ordered for my build.

I have new heads that support a .520 lift. Valve springs and retainers included. As long as my cam selection does not exceed that amount of lift, I don't have to order new springs correct?

Title: Re: Valve spring question
Post by: Gusgus74 on February 23, 2011, 01:46:02 pm

You need to multiply the cam lobe lift by your rocker ratio to determine the true lift at the spring. I would still mock up a solid lifter, pushrod and rocker and spin the motor one revolution to verify if the spring is binding.

Title: Re: Valve spring question
Post by: VileZambonie on February 23, 2011, 03:41:17 pm

Valve springs need to meet the cam manufacturers specifications as well as be installed at the correct specifications.