Need stock diameter valve springs good for .480 lift??
04-07-2002, 11:10 PM
#1
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Need stock diameter valve springs good for .480 lift??
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!
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!
Last edited by 89ROC; 04-07-2002 at 11:12 PM.
04-08-2002, 03:04 AM
#3
I used Manley springs, here's the info:
https://www.thirdgen.org/techbb2/sho...threadid=47463
https://www.thirdgen.org/techbb2/sho...threadid=47463
04-08-2002, 04:56 AM
#4
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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.
Most speed shops can get them. Or order them thru Summit.
04-08-2002, 05:15 AM
#5
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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.
04-08-2002, 06:31 AM
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Car: 89rs
Engine: 400Sb
Transmission: Tremec 3550
factory springs can go .49 if properly setup
but.. it will shorten the life.
The seat pressure on a HOT-LT4 spring is ok for flat tappet.
The seat pressure on a HOT-LT4 spring is ok for flat tappet.
04-08-2002, 07:14 AM
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Re: factory springs can go .49 if properly setup
Originally posted by jcb999
but.. it will shorten the life.
The seat pressure on a HOT-LT4 spring is ok for flat tappet.
but.. it will shorten the life.
The seat pressure on a HOT-LT4 spring is ok for flat tappet.
Those springs are 1.25" and only about 25 bucks new.
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04-08-2002, 09:35 AM
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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
04-08-2002, 10:15 AM
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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
04-08-2002, 02:39 PM
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Originally posted by Beefy89
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
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
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