Yet another cam choice thread but with a twist (updated)
Thread Starter
Teching In
Joined: Jun 2023
Posts: 15
Likes: 3
From: Alabama
*Source: Motor Trend article What Is the Biggest Camshaft for a Stock LS3 6.2L V-8? (motortrend.com)*
Numbers on an engine dyno, fwiw.
"The 8710 cam picks up 26 degrees of intake and 31 degrees of exhaust duration at 0.050, and 0.074/0.080-inch lift. It clears the stock pistons, making it the largest drop-in cam Summit offers for a daily driver. We noticed immediately that the engine revved easily to 7,000 rpm. Peak torque moved from 4,800 rpm to 5,400 rpm and gained 22 lb-ft for a total of 492 lb-ft with more than 400 lb-ft from 2,800. Horsepower increased from 484 at 6,100 to 549 at 6,600. With a little more cylinder head and intake flow, it would have continued to make power past 7,000. Not bad for a weekend's work."
Last edited by LSNA6; Jul 19, 2023 at 01:19 PM.
TECH Enthusiast
Joined: May 2008
Posts: 641
Likes: 572
From: Carnation, WA
So you're saying that the Design XS intake manifold and the quoted summit 8710R1 cam, seem like a good choice then for a 7000RPM setup with an otherwise stock rotating assembly? Or should I look into having the factory heads cnc ported and polished to go with it?
*Source: Motor Trend article What Is the Biggest Camshaft for a Stock LS3 6.2L V-8? (motortrend.com)*
Numbers on an engine dyno, fwiw.
"The 8710 cam picks up 26 degrees of intake and 31 degrees of exhaust duration at 0.050, and 0.074/0.080-inch lift. It clears the stock pistons, making it the largest drop-in cam Summit offers for a daily driver. We noticed immediately that the engine revved easily to 7,000 rpm. Peak torque moved from 4,800 rpm to 5,400 rpm and gained 22 lb-ft for a total of 492 lb-ft with more than 400 lb-ft from 2,800. Horsepower increased from 484 at 6,100 to 549 at 6,600. With a little more cylinder head and intake flow, it would have continued to make power past 7,000. Not bad for a weekend's work."
*Source: Motor Trend article What Is the Biggest Camshaft for a Stock LS3 6.2L V-8? (motortrend.com)*
Numbers on an engine dyno, fwiw.
"The 8710 cam picks up 26 degrees of intake and 31 degrees of exhaust duration at 0.050, and 0.074/0.080-inch lift. It clears the stock pistons, making it the largest drop-in cam Summit offers for a daily driver. We noticed immediately that the engine revved easily to 7,000 rpm. Peak torque moved from 4,800 rpm to 5,400 rpm and gained 22 lb-ft for a total of 492 lb-ft with more than 400 lb-ft from 2,800. Horsepower increased from 484 at 6,100 to 549 at 6,600. With a little more cylinder head and intake flow, it would have continued to make power past 7,000. Not bad for a weekend's work."
On The Tree
Joined: Feb 2023
Posts: 109
Likes: 59
Okay so that being said, If you want good power and have it drive nice, I'd go with the cam motion track day cam for stock cubes. Pair it with a fast long runner intake. Should be able to run it to 6500ish and have great throttle response. Shouldn't surge. With an ls3 head and stock cubes, would likely make 450 - 470 wheel.
Hydraulic Roller CamshaftAggressive PerformanceDuration at .050": 220/232110 Lobe Center Angle with a 106 Intake CenterlineLift with 1.7 Rocker Arm Ratio: .595"/.586"Recommended Displacement: 5.3-6.2 Liter EnginesCylinder Heads: Cathedral Port or Rectangle PortRecommended Compression Ratio: 9.4.0-11.5:1Recommended Headers: 1 3/4" - 1 7/8"Recommended Stall Converter: 3000-3800Recommended Rear Axle Ratio: 3.42-4.30
Hydraulic Roller CamshaftAggressive PerformanceDuration at .050": 220/232110 Lobe Center Angle with a 106 Intake CenterlineLift with 1.7 Rocker Arm Ratio: .595"/.586"Recommended Displacement: 5.3-6.2 Liter EnginesCylinder Heads: Cathedral Port or Rectangle PortRecommended Compression Ratio: 9.4.0-11.5:1Recommended Headers: 1 3/4" - 1 7/8"Recommended Stall Converter: 3000-3800Recommended Rear Axle Ratio: 3.42-4.30
That cam has 10 degrees of overlap. If it's really a street driven car, I'm betting you'll like it a lot less than the 230/242 117+5 cam you were talking about earlier. I had a cam with 10 degrees of overlap in my car for a while, and it *sucked* for smooth driveability on the street at low load and low throttle opening (i.e. .... 99% of street driving in an LS Miata). My current cam is 1.5 degrees overlap, and pulls fine up to the limiter, which I have set at 7200 rpm. If I ever replaced the cam (which I'm not considering, except some of us have trouble leaving **** alone), I'd go for even less overlap, since the vast majority of my driving is on the street, and it would help idle and low load smoothness. The cam in my engine now runs fine on the street, but it took me 250 or so iterations of my tune to get there.
That cam has 10 degrees of overlap. If it's really a street driven car, I'm betting you'll like it a lot less than the 230/242 117+5 cam you were talking about earlier. I had a cam with 10 degrees of overlap in my car for a while, and it *sucked* for smooth driveability on the street at low load and low throttle opening (i.e. .... 99% of street driving in an LS Miata). My current cam is 1.5 degrees overlap, and pulls fine up to the limiter, which I have set at 7200 rpm. If I ever replaced the cam (which I'm not considering, except some of us have trouble leaving **** alone), I'd go for even less overlap, since the vast majority of my driving is on the street, and it would help idle and low load smoothness. The cam in my engine now runs fine on the street, but it took me 250 or so iterations of my tune to get there.
TECH Resident
Joined: Jun 2011
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I know it's a cliché, but it really is mostly all in the tune. Consider my cam, a Futral by Cam Motion, 232°/250°@.050" lift, on a 114° LSA., .603"/.608" lift, 17° overlap. It's in an LS7, which does tame it a bit, but it idles smoother than you might think. If I was after lope, which I've never pursued on any cam I've bought, I'd be a bit disappointed. My tuner has done a great job, for sure. Rich Gala@Motor City Speed. They do great work.....
https://ls1tech.com/forums/generatio...l#post17031139
The real concern is about part throttle driveability while still keeping the WOT torque manageable in an extremely light vehicle with small tires. That would be accomplished by minimizing the overlap and being careful not to have too late of an IVC (for the driveability side), all while having a healthy amount of intake/exhaust duration to push the powerband up @full throttle. The curve isn't nearly as peaky as the larger overlap, yet carries out consistently into the top end. It's a different approach than you'd do for a 3500lb+ car (or truck) with wide tires, setup for occasional 1/4 mile but intended to be spend more time street driving.
Last edited by 68Formula; Jul 19, 2023 at 05:45 PM.
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I have the old BTR stage 2 cam with 4 degrees overlap in a LS1. It drives pretty good at low rpm. Once I switched to a taper bore Holley TB the parking lot and cruise lane drivability improved a lot.
Teching In
Joined: Jan 2020
Posts: 15
Likes: 11
Hey, fellow V8 Miata guy here. I have a Summit 8715 cam in my LS2 222/234 with .600/.575 lift. It idles perfect, has great torque. My car makes 607whp and 626tq on 9 psi and 91 octane with a 7275 turbo and a full 3" exhaust. Frankly I think 450whp is perfect for the chassis and you could get there with an ls3 and this cam.
Thread Starter
Teching In
Joined: Jun 2023
Posts: 15
Likes: 3
From: Alabama
Hey, fellow V8 Miata guy here. I have a Summit 8715 cam in my LS2 222/234 with .600/.575 lift. It idles perfect, has great torque. My car makes 607whp and 626tq on 9 psi and 91 octane with a 7275 turbo and a full 3" exhaust. Frankly I think 450whp is perfect for the chassis and you could get there with an ls3 and this cam.