I have the comp 280H cam with 230 duration & .480 lift. It's in a 75' model 350 block with 70' Model 400 heads (598 casting). I am getting better heads later...btw
I just need some springs that will last for now...
It seems like every spring Compcams makes is bigger that 1.25". Can I use the LT4 springs (used in the HOT cam kit)? Or just regular LT4 springs? Will it be OK to use the LT4 springs which are for a hyd. roller cam? I was thinking they may put too much pressure on the flat tappet cam.
What all is out there that I can use? I'm looking to spend 30-35 bucks.
(edit: I need stock diameter springs because I am not going to machine the heads.)

thanks!

 

on stock springs no way it will work, on new stock replacement springs you might be able to sneak by if you keep the R's down.

 

I used Manley springs, here's the info:
https://www.thirdgen.org/techbb2/sho...threadid=47463

 

Try a set of K-motion K-700 springs. They'll work fine with your Comp 280magnum cam and stock retainers and keepers.
Most speed shops can get them. Or order them thru Summit.

 

i built a 355 once with a .480 lunati cam and used stock diameter lunati springs, don't know the number right now and don't have a catalog, but it shouldn't be hard to find out if you look.

 

but.. it will shorten the life.
The seat pressure on a HOT-LT4 spring is ok for flat tappet.

 

Isn't the HOT good for .525 lift?
Those springs are 1.25" and only about 25 bucks new.

 

BTW, I am asking about "stock diameter" springs, not "stock springs".

 

I installed GM Hi-Performance springs with an LT1 cam and 1.6 roller tips.They have a little bigger diameter, but fit in the seats fine.$32.95 at www.competitionproducts.com

 

thanks! Now I am not sure if I should get the LT4 springs or the GM Hi-performance ones. Anyone know the specs on the LT4 springs...part no. 12495494

 

I ordered those springs with the stock LT4 retainers & locks. Will it be necessary to use shims with this set up? What should the installed height be?