I picked up a set of cnc ported 823's valve size 2.15 1.55

What length valves do i need to run and what is recommend for a spring.
the cam goes to .575 lift

Figured i would run stock rockers with updated trunions

 

Lift Intake Exhaust

0.100 70.4 51.4

0.200 152.5 105.3

0.300 216.0 145.4

0.400 261.7 175.8

0.500 306.0 202.1

0.600 337.4 226.6

0.700 360.5 232.6

Flowed on 4.060" Bore and no pipe

 

I would run a dual spring with less than 400lb @ .600" lift. That should keep you safe and a little more reliable.

 

any brand preference, trying to figure out valve length as well i know some of the ls7 stuff uses longer valves

 

I have only heard good things about the tooley springs. I will be using them when I have to replace mine.

 

get you some ls3 valves which are lighter. i run ls3 heads with psi 1511s (i know most prefer dual springs) but i trust the psi and pac single springs. i do run them with titanium retainers to lightened up my valvetrain. nice looking heads.

 

well these are cut for 2.15 1.55 valves

I found exhaust valves but intakes are another issue