Stock LS5 Dyno Numbers
Race Director
Joined: Dec 1999
Posts: 11,096
Likes: 990
From: Sierra Foothills CA
Thread Starter
Burning Brakes
Joined: Jul 2013
Posts: 1,139
Likes: 82
LS5 Cam
Looked up the cam specs the other day for this LS motor...its a Comp Cam 11-432-8, its 282 intake, 288 exhaust, @.050 230 int and 236 exh. Lobe separation 110.0, roller lifters.
Kinda late, but what do you guys think about this cam spec for this kinda street motor? When I look at other motors the torque is not too bad. Can't wait to see how the motor responds in the car.
Kevin
Kinda late, but what do you guys think about this cam spec for this kinda street motor? When I look at other motors the torque is not too bad. Can't wait to see how the motor responds in the car.
Kevin
Racer
Joined: Oct 2006
Posts: 435
Likes: 18
From: Florida
You definitely need to get the exhaust sorted... huge fall in torque it's definitely choking from something. I would think that cam should run out to 6000 rpm as long as valve train is stable. If you could post the dyno graph these guys could maybe help a little more.
Instructor
Joined: Apr 2009
Posts: 114
Likes: 1
From: Bradenton, FL
Drifting
Joined: Oct 2005
Posts: 1,615
Likes: 150
From: Forth Worth TX
Thread Starter
Burning Brakes
Joined: Jul 2013
Posts: 1,139
Likes: 82
The exhaust shouldn't be the issue at this point as I was running stock cast manifold and only two feet of straight pipe on the dyno, I'm sure my power will drop a lot once the stock exhaust system-mufflers are installed. The builder did spend some time matching and cleaning up the stock exhaust manifold, it would be interesting to have done some dyno runs before and after but he wanted to get them completed with the engine.
We had the dyno set to 5500rpm, I don't know what the limit of the cam-engine is. We both felt this was a good limit for this engine.
Kevin
We had the dyno set to 5500rpm, I don't know what the limit of the cam-engine is. We both felt this was a good limit for this engine.
Kevin
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
Burning Brakes
Joined: Feb 2012
Posts: 925
Likes: 7
My observation was that *just* a CR change was not going to result in a significant gain at this build level.
The right cam will absolutely make a difference - but the concept of running too much static CR to allow using a too big cam is the dynamic compression craze that I don't subscribe to. Just one guy's take;let's stay on topic.
The right cam will absolutely make a difference - but the concept of running too much static CR to allow using a too big cam is the dynamic compression craze that I don't subscribe to. Just one guy's take;let's stay on topic.
I did understand you were only talking about the HP increase from the compression change itself, without any other changes. (And I know you know your stuff.) I should have been much more direct. I was suggesting that the "right cam" may be a way to more power while still maintaining the stock look of the engine. There are at least 2 guys on CF that I have been in contact with that have recently upgraded to hydraulic roller cams from Chris Straub. One of them has an 8.5:1 CR 454. The other is a 454 also, but with unknown CR. Per Chris, a 50 to 75 HP bump is possible. That's pretty good bang for the buck.
Burning Brakes
Joined: Feb 2012
Posts: 925
Likes: 7
Yessir, but then you need the intake/heads/exhaust to take full advantage of the cam- and I know you know that already. When I went from the stock intake to the Perf. RPM Airgap it made a very noticeable difference. The aluminum heads with solid lifter cam really picked things up. As Hamad said, headers are a big factor. With the right stuff in place you can still make decent power with mild compression. Mine is only 9.5 to 1 and the car traps at just under 120 MPH through the mufflers. The OP could pick up a lot of power with a few carefully chosen parts.
Thread Starter
Burning Brakes
Joined: Jul 2013
Posts: 1,139
Likes: 82
You guys are probably correct in saying a custom cam would have optimized this package. Here are the cam specs, lets here what I sould have went with.
Comp Cam 11-432-8, its 282 intake, 288 exhaust, @.050 230 int and 236 exh. Lobe separation 110.0, roller lifters.
To rehash:
9.5 to 1 compression
stock intake (cleanup, gasket match)
stock exhaust manifolds (cleanup,gasket match)
Stock heads and valves, three angle valve job
3.08 gears
4speed
Kevin
Comp Cam 11-432-8, its 282 intake, 288 exhaust, @.050 230 int and 236 exh. Lobe separation 110.0, roller lifters.
To rehash:
9.5 to 1 compression
stock intake (cleanup, gasket match)
stock exhaust manifolds (cleanup,gasket match)
Stock heads and valves, three angle valve job
3.08 gears
4speed
Kevin
Instructor
Joined: Apr 2009
Posts: 114
Likes: 1
From: Bradenton, FL
No headers just stock manifolds flowing through 2-1/2" pipes to a couple of Allen's Corvette Loud Exhaust Mufflers.
I used to run a Quadrajet but installed an old Holley 800 CFM spread bore double pumper. The motor seemed to love it....a lot more responsive.
Added HEI and it has a Lunati Bare Bones 10201LK Cam
I used to run a Quadrajet but installed an old Holley 800 CFM spread bore double pumper. The motor seemed to love it....a lot more responsive.
Added HEI and it has a Lunati Bare Bones 10201LK Cam
Drifting
Joined: Oct 2005
Posts: 1,615
Likes: 150
From: Forth Worth TX
No headers just stock manifolds flowing through 2-1/2" pipes to a couple of Allen's Corvette Loud Exhaust Mufflers.
I used to run a Quadrajet but installed an old Holley 800 CFM spread bore double pumper. The motor seemed to love it....a lot more responsive.
Added HEI and it has a Lunati Bare Bones 10201LK Cam
I used to run a Quadrajet but installed an old Holley 800 CFM spread bore double pumper. The motor seemed to love it....a lot more responsive.
Added HEI and it has a Lunati Bare Bones 10201LK Cam
