91 L98 Crankcase Ventilation
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Senior Member

Joined: Aug 2008
Posts: 710
Likes: 32
From: pensacola florida
Car: 1989 Firebird Formula
Engine: 5.7 LS1
Transmission: 4L60E
Axle/Gears: 3.27
91 L98 Crankcase Ventilation
My crankcase tube from the valve cover to throttle body is leaking slightly. Ive been looking around for a replacement with out much luck. I looked on hawks and came up with this http://www.hawksthirdgenparts.com/pr...-Assembly.html
can this work? I would just need to plug the hole on the throttle body right? I want to make sure going this route isn't going mess up anything up? The car hardly has any emission left to it anyway since i did my intake swap.
can this work? I would just need to plug the hole on the throttle body right? I want to make sure going this route isn't going mess up anything up? The car hardly has any emission left to it anyway since i did my intake swap.
Joined: Dec 2004
Posts: 16,751
Likes: 995
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 91 L98 Crankcase Ventilation
http://www.ebay.com/itm/160792998139...84.m1423.l2649
http://www.ebay.com/itm/New-Genuine-...1558a7&vxp=mtr
http://www.ebay.com/itm/New-Genuine-...1558a7&vxp=mtr
Last edited by Tuned Performance; Jan 2, 2013 at 07:48 PM.
Thread Starter
Senior Member

Joined: Aug 2008
Posts: 710
Likes: 32
From: pensacola florida
Car: 1989 Firebird Formula
Engine: 5.7 LS1
Transmission: 4L60E
Axle/Gears: 3.27
Re: 91 L98 Crankcase Ventilation
I tracked down the dorman number, and im going to buy one this weekend to see if the leaking stops.
Joined: Apr 2005
Posts: 7,736
Likes: 14
From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: 91 L98 Crankcase Ventilation
to the engine like it is on a MAF engine.
You could even run a open breather in the valve cover , is only the air supply for the PCV system
Re: 91 L98 Crankcase Ventilation
Silicon hose makes for good replacements on those hard to find pieces as they are very pliable which allows bending without kinking. I've used a couple and worked great.
Thread Starter
Senior Member

Joined: Aug 2008
Posts: 710
Likes: 32
From: pensacola florida
Car: 1989 Firebird Formula
Engine: 5.7 LS1
Transmission: 4L60E
Axle/Gears: 3.27
Re: 91 L98 Crankcase Ventilation
I replaced the grommet tonight, and so far no more leaks. So i believe this problem is fixed, 42062 i believe is the grommet i used. I was surprised when i pulled the original one out, its a lot longer than the replacement, but the dorman grommet seemed really tight as far as fitting goes compared to the worn out original.
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