I'm getting advice from a shop that i can us the CC943 spring (spec's below) in combination with a R lifter on a comp cam xe230 grind

I believe that znines uses a 943 and type R combo as well.

Does anyone have any comments/suggestions/ warnings??

I would think that some of the dangers may be that I loose power turning this combo and will wear down the lobes faster.

thanks



cc 943 pacaloy valve springs ; com cams
1.550 in. O.D. outer, .812 in. I.D. inner, dual pacaloy valve springs

Clsd seat pressure 240 lbs
open seat pressure 598 lbs
coil bind is 1.150
spring rate 551 lbs/in

 

What are the cam specs? If it's an HR cam, that's more spring than anyone uses and probably more than is needed.

Rich Krause

 

Sorry - yes it a HR cam
either
Comp Cams XE 230 / 236, .510 / .520 (1.5) 112 LSA,
or 224/230 duration @ .050", .536"/.544" lift

The issue is that the heads come with a basically new set of springs and retainers and I'm told I can use them rather then buy a new set -

So the question is - what's the downside.

 

Lots of wear/stress on the other valvetrain components. Rockers, lifters, pushrods, cam, valve seats, will all have decreased longevity with high pressures. Stiffer springs also produce more heat and generally will not last as long. Otherwise, everyone would be running the stiffest spring they could get. Those Pacalloy springs are expensive. Twice the price of a conventional spring. I bet you get sell them for at least the price of new set of more appropriate springs like the Comp #977 or #978.

This is an LT1 or least some small block Chevy, right? The #943 spring has a 1.555" OD, bigger than what is installed on most SBC heads. Are the valves really huge or something? Unless it's a big block with huge (heavy) valves, this is simply too much spring.

Rich Krause