1990 Cam Specs
Thread Starter
Registered User
Joined: Feb 2005
Posts: 462
From: Hamilton, NJ
1990 Cam Specs
Does anybody know where I can find cam specs for a 1990 L98 engine with a roller cam? Thirdgen.org has the duration and lift, but I need the valve timing specs: IVO IVC EVO EVC (Its for desktop dyno if you havent figured it out yet 
)
The GM Part # is 10111773
)The GM Part # is 10111773
3rd Gen Tech Moderator
Joined: Jun 1999
Posts: 780
From: Orange County, CA
Re: 1990 Cam Specs
If you put the duration and lift values at 0.050" from thirdgen.org, desktop dyno will tell you the valve timing numbers on the main screen. At least, mine does, but I dont have it installed on this computer.
Registered User
Joined: Feb 1999
Posts: 2,947
From: Springfield,OH. U.S.A.
Re: 1990 Cam Specs
14093643 Hydraulic Roller Tappet
This hydraulic roller tappet is used on the 87 350ci Corvette and IROC-Z Camaro. The duration at lash point in degrees (intake/exhaust) is 294/294; duration at .050" tappet lift (intake/exhaust) is 202/206; and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is 403/415. Valve lash is zero/zero and lobe centerline is 115 degrees.
This hydraulic roller tappet is used on the 87 350ci Corvette and IROC-Z Camaro. The duration at lash point in degrees (intake/exhaust) is 294/294; duration at .050" tappet lift (intake/exhaust) is 202/206; and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is 403/415. Valve lash is zero/zero and lobe centerline is 115 degrees.
3rd Gen Tech Moderator
Joined: Jun 1999
Posts: 780
From: Orange County, CA
Re: 1990 Cam Specs
That 1987 cam was used in both the Corvette and Camaro in 1987 only. 1988 and 1989 use a 207/213 cam with .415/.430 lift and 117 LSA. The 90-92 cam is 203/207 with .413/.428 lift and 115 LSA.
Thread Starter
Registered User
Joined: Feb 2005
Posts: 462
From: Hamilton, NJ
Re: 1990 Cam Specs
Originally Posted by Kevin91Z
The 90-92 cam is 202/207 with .413/.428 lift and 115 LSA.
Yeah that seems to be the only info I could ever find. I even called up a GM in my area and they couldnt give me those numbers..too bad Chevy stepped down to a weaker cam in 1990 though
Thread
Thread Starter
Forum
Replies
Last Post