Using ZZ4 springs, retainers, and keys on L98 valves
03-23-2004, 02:07 PM
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Car: 1986 IROC-Z
Using ZZ4 springs, retainers, and keys on L98 valves
I'm probably going to be swapping a ZZ4 cam in my L98, and I've read the suggestions regarding valve guide clearance, screw-in studs, and valve springs. I will be running ZZ4 springs, retainers, and keys.
The retainers, 12495492, appear to be the non-rotator style. Is this still correct for the exhaust valves?
The keys, 24503856, are designed for 11/32" valve stems. I may be wrong, but weren't some valve stems 5/16" in diameter? What size does the L98 have? I'd check that myself, but the heads are at the machine shop.
The retainers, 12495492, appear to be the non-rotator style. Is this still correct for the exhaust valves?
The keys, 24503856, are designed for 11/32" valve stems. I may be wrong, but weren't some valve stems 5/16" in diameter? What size does the L98 have? I'd check that myself, but the heads are at the machine shop.
03-23-2004, 03:15 PM
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Car: yy wife, crazy.
Engine: 350, Vortecs, 650DP
Transmission: TH-350
Axle/Gears: 8.5", 3.42
Just to add...
AFAIK the L98 heads don't, nor have ever had exhaust rotators. I think they saved that honor for the 187, 191, and 193 POS "swirl port" heads.
AFAIK the L98 heads don't, nor have ever had exhaust rotators. I think they saved that honor for the 187, 191, and 193 POS "swirl port" heads.
03-23-2004, 03:18 PM
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Car: 82 Berlinetta/57 Bel Air
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Originally posted by AJ_92RS
AFAIK the L98 heads don't, nor have ever had exhaust rotators. I think they saved that honor for the 187, 191, and 193 POS "swirl port" heads.
AFAIK the L98 heads don't, nor have ever had exhaust rotators. I think they saved that honor for the 187, 191, and 193 POS "swirl port" heads.
03-23-2004, 07:03 PM
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Car: 1986 IROC-Z
Thanks for the clarification on the rotators and valve stem sizes. Attached is a picture of the valvetrain. I haven't pulled the retainers, but the ones on the exhaust valves look just like the rotator-style on a set of swirl port heads that I have. What do you think?
Yep ede, I saw your recommendation about the valve springs in another post. I can't recall the reasoning behind not using GM's springs, though... didn't you say that they weren't made by GM or something?
Yep ede, I saw your recommendation about the valve springs in another post. I can't recall the reasoning behind not using GM's springs, though... didn't you say that they weren't made by GM or something?
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03-24-2004, 04:21 PM
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Car: yy wife, crazy.
Engine: 350, Vortecs, 650DP
Transmission: TH-350
Axle/Gears: 8.5", 3.42
Yup. M R Rotators. 
Keep in mind that GM springs are from the lowest bidder, not the best manufacture. If I were to coil up some springs out of bailing wire and sell them to GM for .001¢ per 1000, then they'd buy mine.
Keep in mind that GM springs are from the lowest bidder, not the best manufacture. If I were to coil up some springs out of bailing wire and sell them to GM for .001¢ per 1000, then they'd buy mine.
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