90 L98 stock heads- how much lift can they take?
06-17-2020, 10:29 AM
#1
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Car: 90 Formula 350
Engine: 350
Transmission: 700r4
Axle/Gears: Dana 44 3.54
90 L98 stock heads- how much lift can they take?
I searched and searched so i have to ask how much lift can stock L98 Iron heads take? thinking about ZZ4 that has .474 I .510 E lift
I know stock vortecs have issues above .450- .460 but what about L98s?
I know stock vortecs have issues above .450- .460 but what about L98s?
06-17-2020, 10:56 AM
#2
Re: 90 L98 stock heads- how much lift can they take?
When I searched for this same topic the general consensus was the same result you found for the vortec’s. I ended up buying LS6 beehives and Comp 787 retainers, took everything to the machine shop, told them my cam specs (GM 94666492 w/1.6 rr’s) and walked away. They did their magic and told me I was good.
06-18-2020, 03:00 PM
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Car: 90 Formula 350
Engine: 350
Transmission: 700r4
Axle/Gears: Dana 44 3.54
Re: 90 L98 stock heads- how much lift can they take?
I cant believe that's all they'd take I'm not going through all that for a cam on this engine. I have a ZZ4 and a ramjet laying around I know ramjet will work - was hopping ZZ4 would hunt
06-18-2020, 03:47 PM
#4
Re: 90 L98 stock heads- how much lift can they take?
The numbers I kept seeing were .470 - .480 max. IIRC it wasn’t a coil bind issue but a matter of the retainer hitting the guide boss. I had mine looked over and refreshed so it was a good time to upgrade anyway.
06-18-2020, 05:56 PM
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Car: 1989 Pontiac Formula 350
Engine: L98
Transmission: 700R4
Axle/Gears: BorgWarner 3.27 Posi
Re: 90 L98 stock heads- how much lift can they take?
My cam is .450/.465 and I have no issues.
06-23-2020, 01:48 PM
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Car: 90 Formula 350
Engine: 350
Transmission: 700r4
Axle/Gears: Dana 44 3.54
Re: 90 L98 stock heads- how much lift can they take?
OK guys thanks if I do anything it will be the Ramjet cam
06-24-2020, 12:39 AM
#7
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Re: 90 L98 stock heads- how much lift can they take?
If you hold off until this weekend, I can get you some pretty close numbers. I have the stock L98's in the shop.
I think one issue as you start getting closer to .500 lift is a chance you might pull the studs?
I think one issue as you start getting closer to .500 lift is a chance you might pull the studs?
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06-26-2020, 01:14 AM
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Car: 89 iroc
Engine: LB9
Transmission: 700R4
Axle/Gears: 2.72
Re: 90 L98 stock heads- how much lift can they take?
Just last year I had a cam put in my lb9 different yes but it took .480/.480. Just like my shop told me I recommend going new everything else also guides, stems, seals, studs, etc.
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