...1.6 rockers did zilch on mine, tried all four possible combos, same e.t.
what valvesprings do I need?
Drifting
Joined: May 2002
Posts: 1,581
Likes: 2
From: The Motor City
How many miles are on the existing springs? If they don't have many miles on them they may not need to be replaced.
If you're on strict budget and you have to replace them I'd suggest sticking with stock springs. That's what I have on my '89 L98 when I installed 1.6:1 roller rockers. I spoke to my engine shop about going with stiffer springs and they said there's no need to unless I was planning to rev the engine higher then stock. And that won't happen with the stock cam and stock TPI setup, so anything beyond the stock springs was overkill.
Now, if you're planning on additional mods in the future, then the GMPP LT4 springs already suggested are the best way to go. Especially if the price difference between stock and the LT4 springs is marginal and your budget can handle it.
If you're on strict budget and you have to replace them I'd suggest sticking with stock springs. That's what I have on my '89 L98 when I installed 1.6:1 roller rockers. I spoke to my engine shop about going with stiffer springs and they said there's no need to unless I was planning to rev the engine higher then stock. And that won't happen with the stock cam and stock TPI setup, so anything beyond the stock springs was overkill.
Now, if you're planning on additional mods in the future, then the GMPP LT4 springs already suggested are the best way to go. Especially if the price difference between stock and the LT4 springs is marginal and your budget can handle it.
Last edited by TheCorvetteKid; Oct 12, 2007 at 09:14 AM.
Melting Slicks
Joined: Oct 2005
Posts: 3,178
Likes: 5
From: Daleville Indiana
St. Jude Donor '08
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Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
if there is an alignment prob with the new rockers, new pushrods will be reqd, of course.
bump for retainer and lock info
Pro
Joined: Sep 2007
Posts: 545
Likes: 2
From: st albert alberta
you need the gmpp lt4 hot cam light weight retainers 1.32diam and keepers and the shims that fit under the springs so they dont dig into the aluminum head all parts are from g.m. hot cam spring part #10212808 set of 16 ,light weight retainer kit (16)comes with keepers 12495492 this is the whole kit .i forgot the shims 10212809
Last edited by makn u shiver; Oct 13, 2007 at 07:08 PM.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
The other LT4 pieces are desirable but not absolute.
ZZ4 uses same springs without exotic LT4 hardware
Team Owner
Joined: Jan 2003
Posts: 20,322
Likes: 248
From: Summerland B.C. Canada
The retainer's from my 128 heads, would not work with my LT4 springs. Not sure about the D port heads, but there is a good chance they may not work either.
