L98 Cam / Valve Spring Question.
Thread Starter
Safety Car
Joined: Feb 2000
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From: MANDEVILLE, LA La
L98 Cam / Valve Spring Question.
Building an 87' L98 have Allum. "D" port heads Question: I'm running the ZZ4 Cam has .510" Lift on ex side. Can I use the stock Valve Springs.?If not. Anyone have springs for sale that will work?
Team Owner
Joined: Mar 2000
Posts: 83,383
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From: Boston, MA
Re: L98 Cam / Valve Spring Question. (CAJUN C4)
No you cannot use the stock springs. TPiS has springs they prescribe for all of their cams.
http://www.tpis.com/CatalogPages/CatalogPage.ASP
Goto page 50.
[Modified by scorp508, 11:54 AM 4/28/2003]
http://www.tpis.com/CatalogPages/CatalogPage.ASP
Goto page 50.
[Modified by scorp508, 11:54 AM 4/28/2003]
Racer
Joined: Aug 2002
Posts: 386
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From: Lancaster Lancashire
Re: L98 Cam / Valve Spring Question. (scorp508)
Quote
'No you cannot use the stock springs. TPiS has springs they prescribe for all of their cams. http://www.tpis.com/CatalogPages/CatalogPage.ASP
Goto page 50.'
:iagree:
Check your valve retainer clearance as well. !!! :)
[Modified by Davemc1963-87conv, 10:59 PM 4/28/2003]
'No you cannot use the stock springs. TPiS has springs they prescribe for all of their cams. http://www.tpis.com/CatalogPages/CatalogPage.ASP
Goto page 50.'
:iagree:
Check your valve retainer clearance as well. !!! :)
[Modified by Davemc1963-87conv, 10:59 PM 4/28/2003]
Drifting
Joined: Aug 2000
Posts: 1,521
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From: West Islip New York
Re: L98 Cam / Valve Spring Question. (CAJUN C4)
Add another no to stock springs. Since you're using a ZZ4 cam on the alum 113 heads, why not use the entire valve train as the ZZ4.
GM sells it all. If you need p/n's let me know.
GM sells it all. If you need p/n's let me know.
Thread Starter
Safety Car
Joined: Feb 2000
Posts: 3,771
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From: MANDEVILLE, LA La
Re: L98 Cam / Valve Spring Question. (1MoorTym)
I was planning on getting the ZZ4 GM Springs.p/n:12495494 as a kit of 16 @ #12551483.springs.? 101#'s @ 1.78" ?
sound right?
sound right?
Drifting
Joined: Aug 2000
Posts: 1,521
Likes: 0
From: West Islip New York
Re: L98 Cam / Valve Spring Question. (CAJUN C4)
I was planning on getting the ZZ4 GM Springs.p/n:12495494 as a kit of 16 @ #12551483.springs.? 101#'s @ 1.78" ?
sound right?
sound right?
10212809 - Va;ve Spring Shim LT4
12495492 - Valve Spring Cap Kit LT4
12495503 - Valve Spring Keys
The cam will run fine with the stock chip, it might be a little choppy in open loop but then it settles down. I'm getting ready for a chip now, but I've already went with a ported plenum, big mouth base and large tube runners.
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Racer
Joined: Aug 2002
Posts: 386
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From: Lancaster Lancashire
Re: L98 Cam / Valve Spring Question. (1MoorTym)
You need to check the size of the spring seats on your heads.
As far as I am aware, most early L98 heads (113 & 128) only had 1.25" spring seats. the same as ZZZ-ZZ2 engines. Later heads had the 1.32" (ZZ4/LT4) spring seats. Can anyone else confirm this?
As far as I am aware, most early L98 heads (113 & 128) only had 1.25" spring seats. the same as ZZZ-ZZ2 engines. Later heads had the 1.32" (ZZ4/LT4) spring seats. Can anyone else confirm this?
Drifting
Joined: Aug 2000
Posts: 1,521
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From: West Islip New York
Re: L98 Cam / Valve Spring Question. (Davemc1963-87conv)
Aluminum 113 Heads do have 1.32 spring seats. Its the head the ZZ4 uses as are all the components previously listed. Is the 128 an iron head ?
