L98 cam profile

Reply Subscribe

Thread Tools

Search this Thread

Aug 22, 2012 | 06:37 PM

frank carlson

Thread Starter

Heel & Toe

Joined: Nov 2010

Posts: 23

Likes: 1

L98 cam profile

Does someone know the cam profile for a stock 1988 l98 auto trans? Info such as lift, duration and lobe separation angle. Want to upgade cam but still want good idle and near normal vacuum. Looking at comp cams. Thanks

Aug 22, 2012 | 07:18 PM

coupeguy2001

Le Mans Master

Joined: Sep 2006

Posts: 6,050

Likes: 147

From: Phoenix AZ

2021 C4 of the Year - Modified Finalist

Check out Summit Racng. They have a couple cams for inexpensive cash outlay (cheep)

Aug 22, 2012 | 07:23 PM

ch@0s

Le Mans Master

Joined: Oct 2008

Posts: 9,758

Likes: 49

From: Houston Texas

What ever you do dont buy an ebay Cam. I did and ended up with a big paperweight for an engine.

Aug 22, 2012 | 08:45 PM

rodj

Le Mans Master

Joined: Aug 2000

Posts: 8,838

Likes: 31

From: Australia

Quote:

Originally Posted by frank carlson

does someone know the cam profile for a stock 1988 l98 auto trans? Info such as lift, duration and lobe separation angle.

207/213 .415/.430 117

Aug 22, 2012 | 11:24 PM

Churchkey

Melting Slicks

Joined: Sep 2008

Posts: 2,376

Likes: 111

From: Cherokee National Forest TN

CAM 87 L98 14093643 Dur In/Exh 294'/294' Dur@.050" 202'/206' Lift (w/1.5) .403"/.415" LobSep 114.5'
CAM 88-89 L98 10066049 In/Exh Dur@.050" 207'/213' Lift (w/1.5) .415"/.430" LobSep 117'
CAM 90-91 L98 10111773 In/Exh Dur@.050" 202'/207' Lift (w/1.5) .413"/.428" LobSep 114.5'

Aug 23, 2012 | 12:47 PM

Slow_Lane

Racer

Joined: Mar 2011

Posts: 296

Likes: 0

From: Derby (Wichita area) KS

Quote:

Originally Posted by Churchkey

Interesting...so can you educate me? Looks like the 87 and 90-91 cams are more similar, yet not identical and the 88-89 is a bit of an outlier in terms of specs. Is one of these preferable over another? Do we know why GM made these changes?

Just currious.

Thanks,

Dave

Aug 24, 2012 | 03:06 PM

frank carlson

Thread Starter

Heel & Toe

Joined: Nov 2010

Posts: 23

Likes: 1

l98 cam specs

thank you very much for the technical info.

Nov 17, 2013 | 07:27 PM

Czarvtte

Advanced

Joined: Aug 2013

Posts: 75

Likes: 0

Sorry to wake up this old thread...but I find it's information very useful. I have an 88' L98 and was looking to upgrade to this cam... http://www.summitracing.com/parts/na...7395/overview/

My purpose for the upgrade is to add a little more aggressiveness to the sound of the engine and not for track purposes. How much of an upgrade is this cam and what would the advantages or disadvantages be? Would I need to make any more changes or upgrade anything else as a result of this new cam? Thanks for all your help.

Corvette Stories

The Best of Corvette for Corvette Enthusiasts

10 Ugly Corvettes That We Still Kinda Love

Joe Kucinski

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

Brett Foote

10 Things Every Corvette Owner Needs (2026 Edition)

Michael S. Palmer

8 Most "Only Corvette Owners Understand" Quirks and Problems

Pouria Savadkouei

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Joe Kucinski

How Much Horsepower Every Corvette Engine "LOST" in 1972

Joe Kucinski

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Michael S. Palmer

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Joe Kucinski

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Joe Kucinski

8 Coolest Corvette Pace Cars (and Replicas) of All Time

Verdad Gallardo

Nov 17, 2013 | 07:54 PM

MrWillys

Drifting

Joined: May 2013

Posts: 1,736

Likes: 31

From: Reno Nevada

Comp cam 08-501-8 will have a smooth idle and run on stock programming. Custom programming can help, but it is a good upgrade.
http://www.summitracing.com/parts/CCA-08-501-8/

Nov 18, 2013 | 07:26 AM

#10

C4in mesa

Drifting

Joined: Dec 2011

Posts: 1,439

Likes: 23

From: mesa az

Quote:

Originally Posted by MrWillys

Comp cam 08-501-8 will have a smooth idle and run on stock programming. Custom programming can help, but it is a good upgrade.
http://www.summitracing.com/parts/CCA-08-501-8/

I chose this cam after I called Summit and asked for a cam that would provide 25-30HP. It sounds great and required no chip. It is weird I must say because it seems the computer needs some adjustment time if I go from a long drive on the freeway back to city driving. Nothing drastic only noticeably at idle. After about 10 minutes everything is normal. I strongly suggest you remove that exhaust system if you want to really get the sound you are looking for along with this terribly under rated cam. For the amount of money needed to go outside the ability of this 1908's computer I am shocked this cam is NEVER mentioned. I improved the air intake, roller rocker arms, and exhaust. I have yet to get this engine RPM over 4000 as I was 145mph and climbing steady. I am a small fry compared to all these big budget builds I read about. My HP is only around 330 at the crank but I totally changed this lame L98 to more like a stock LT-1 but better. I only wish that I had bought a 1990 6 speed and done all this engine work to that year car. No matter it is a fun fun car to drive. When I pull up at a Corvette club meeting the cam and exhaust ALWAYS get compliments.

Nov 18, 2013 | 11:18 AM

#11

Aaron Keating

Drifting

Joined: Nov 2012

Posts: 1,331

Likes: 2

I loaded that cam's specs into my desktop dyno sim 5.
I"m curious have any of you guys dynod the cars?
Looks like it puts the car around 265 horsepower at the crank at 3400 rpm
and a little under 400 ft lbs starting at 1500 rpm.. peak looking like about 410 2k rpm then falling back to 400 till about 2500. On an otherwise stock L98.

I bet that cam is a real giggle fest at stop lights with all that monster torque.

Last edited by Aaron Keating; Nov 18, 2013 at 11:27 AM.

Nov 18, 2013 | 11:32 AM

#12

mcm95403

Le Mans Master

Joined: Nov 2009

Posts: 6,882

Likes: 234

From: Bangkok, Thailand

When I built my engine last year I got an LT-4 replica cam from Scoggin-Dickey. It works great, idles nicely and runs like a stocker - as would be expected since it is a stock cam for a 1996 LT-4, just a little bigger than the L-98 cam. You get .480 lift with 1.5 rockers and the duration is 204/211 @ .050 as I recall on a 115 lobe separation. Also, it was only $235. You can use stock LT-4 valve springs with it as well.

Call them at 800-456-0211

- ask for part number SD1142

Last edited by mcm95403; Nov 18, 2013 at 11:46 AM.

Nov 18, 2013 | 02:36 PM

#13

C4in mesa

Drifting

Joined: Dec 2011

Posts: 1,439

Likes: 23

From: mesa az

Quote:

Originally Posted by Aaron Keating

I've never dyno tested my car. But before my rebuild my 1988 C4 could not beat a Toyota Camry ! Talk about embarrassing man. Well today I eat most Mustang GT's rather easily. New ones not old ones.

Nov 18, 2013 | 08:07 PM

#14

Czarvtte

Advanced

Joined: Aug 2013

Posts: 75

Likes: 0

So I take it that the Comp Cam 08-501-8 is far better than the GM Performance cam above? Thx for all the great info guys!

Nov 18, 2013 | 08:20 PM

#15

MrWillys

Drifting

Joined: May 2013

Posts: 1,736

Likes: 31

From: Reno Nevada

Yes, the 501 will create more power than the LT4. While they both have close to the same lift, the LT4 is done using a 1.6 rocker to get to .480. The 501 has more duration at 212 / 218, and because it has a tighter LSA at 112 it will create more power is a shorter powerband than the LT4's 115. All in all, the 501 compliments the rpm range of the TPI intake very well.

Nov 18, 2013 | 09:41 PM

#16

C4in mesa

Drifting

Joined: Dec 2011

Posts: 1,439

Likes: 23

From: mesa az

Quote:

Originally Posted by Aaron Keating

I am very very happy with this cam ! I made mods to the air intake, Edelbrock 3860, SLP ported gasket matched runners and true dual 2.5" exhaust. Some other mods but those 3 made the biggest difference in overall gains from the lame stock L98. I have to say my 2:73 gears are what keep me from being able to turn my tires into grease. Depending on what surface I'm on I rip tires and start spinning from left to right before it just rockets straight ahead. If I am on a rough surface it just goes straight ahead without ripping tire. I think allot of the credit goes to the 08-501-8 cam.

Nov 19, 2013 | 04:58 PM

#17

Czarvtte

Advanced

Joined: Aug 2013

Posts: 75

Likes: 0

Quote:

Originally Posted by MrWillys

Comp cam 08-501-8 will have a smooth idle and run on stock programming. Custom programming can help, but it is a good upgrade.
http://www.summitracing.com/parts/CCA-08-501-8/

Will this cam work on an '88 L98? (Comp 501)

Nov 19, 2013 | 05:23 PM

#18

C4in mesa

Drifting

Joined: Dec 2011

Posts: 1,439

Likes: 23

From: mesa az

I have this cam. In my 1988 C4. Please send me an email.

Oct 24, 2025 | 04:29 PM

#19

Sam87vetteneedshelp

8th Gear

Joined: Jul 2021

Posts: 8

Likes: 0

From: Toronto

Hello I know this is a very old post but I thought I would try to see if anyone would answer. I decided to go with the Comp Cams 08-501-08. Can you tell me what Spring kit and Rocket arms set up you went with? There are so many option and a little bit overwhelming to decide with what set up to go with. Thanks Sam