Cam - LS2 - Custom or Cam Motion Titan 4
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Teching In
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Cam - LS2 - Custom or Cam Motion Titan 4 I’ve spent about a month designing a cam for an LS2 which is going in a Porsche 951 (944 Turbo). The LS2 intake is being ported by GPI, Custom 1.75” Longtubes and then the cam will be the only engine modifications.
My idea: 229/233 .600/.595 112.5 LSA and 108 ICL
Titan 4 : 227/233 .612/.595 113 LSA and 109 ICL
I feel like torque will come in 200-300 rpm sooner, have a slightly better midrange, and pull cleanly to 66/6700 rpm. Basically just a bit more of an aggressive feeling cam.
The car will be used for spirited backroad driving and occasional lap or 2 at VIR/other east coast courses.
Peak HP is not my main objective, I want the car to be fun and still pull hard to redline.
Thoughts? Go custom or off the shelf. Am I splitting hairs and it really won’t make a difference either way?
My idea: 229/233 .600/.595 112.5 LSA and 108 ICL
Titan 4 : 227/233 .612/.595 113 LSA and 109 ICL
I feel like torque will come in 200-300 rpm sooner, have a slightly better midrange, and pull cleanly to 66/6700 rpm. Basically just a bit more of an aggressive feeling cam.
The car will be used for spirited backroad driving and occasional lap or 2 at VIR/other east coast courses.
Peak HP is not my main objective, I want the car to be fun and still pull hard to redline.
Thoughts? Go custom or off the shelf. Am I splitting hairs and it really won’t make a difference either way?
Launching!
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From: Bradentucky Florida
I would lean toward the Summit 8711 if keeping it EFI, or 8702 if going a 4150 style manifold
Hey @Summitracing
Hey @Summitracing
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Teching In
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I would lean toward the Summit 8711 if keeping it EFI, or 8702 if going a 4150 style manifold
Hey @Summitracing
Hey @Summitracing
That’s way too much cam for what I’m trying to achieve, thanks though!
Cam Motion has a 229 degree cam that put out up some good numbers in the cam dyno chart thread. The Titan 4 is a good all around choice as well.
Last edited by wannafbody; Apr 15, 2026 at 09:29 AM.
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From: Ohio, Georgia, Nevada, Texas
@PorkRoll,
It sounds like you’ve done a good bit of research on cams and came up with specs to suit you and your combo. If everything else checks out and you put either of these two cams in the engine, you’d barely notice a difference, if any.
Looking at the specs:
Your cam: 229/233 .600/.595 112.5+4.5
Titan 4: 227/232 .612/.595 113+4
We like to look at cams in terms of valve events since that’s what really tells the story. At .050", here’s how they break down:
Your cam:
IVO 6.5* BTDC
IVC 42.5* ABDC
EVO 53* BBDC
EVC -0.5* ATDC
6* overlap
Titan 4:
IVO 4.5* BTDC
IVC 42.5* ABDC
EVO 54* BBDC
EVC 0* ATDC
4.5* overlap
So really the differences are small. Your cam opens the intake earlier and carries a bit more overlap, which is going to cost a little idle vacuum and give it slightly more chop. The Titan 4 is just a touch cleaner there.
From a powerband standpoint, these are going to be very close. You’re not shifting the curve in any meaningful way, just changing the character slightly.
It basically just comes down to what you want out of it. If you want a slightly more aggressive feel and a bit more chop with specs you came up with, go custom. If you want something proven that’s going to act exactly how you expect, the Titan 4 is a solid option.
With the ported LS2 intake and 1.75" long tubes, the combo is already there. In a 951 chassis, either one is going to feel strong and responsive. You’re not leaving anything on the table between these two.
It sounds like you’ve done a good bit of research on cams and came up with specs to suit you and your combo. If everything else checks out and you put either of these two cams in the engine, you’d barely notice a difference, if any.
Looking at the specs:
Your cam: 229/233 .600/.595 112.5+4.5
Titan 4: 227/232 .612/.595 113+4
We like to look at cams in terms of valve events since that’s what really tells the story. At .050", here’s how they break down:
Your cam:
IVO 6.5* BTDC
IVC 42.5* ABDC
EVO 53* BBDC
EVC -0.5* ATDC
6* overlap
Titan 4:
IVO 4.5* BTDC
IVC 42.5* ABDC
EVO 54* BBDC
EVC 0* ATDC
4.5* overlap
So really the differences are small. Your cam opens the intake earlier and carries a bit more overlap, which is going to cost a little idle vacuum and give it slightly more chop. The Titan 4 is just a touch cleaner there.
From a powerband standpoint, these are going to be very close. You’re not shifting the curve in any meaningful way, just changing the character slightly.
It basically just comes down to what you want out of it. If you want a slightly more aggressive feel and a bit more chop with specs you came up with, go custom. If you want something proven that’s going to act exactly how you expect, the Titan 4 is a solid option.
With the ported LS2 intake and 1.75" long tubes, the combo is already there. In a 951 chassis, either one is going to feel strong and responsive. You’re not leaving anything on the table between these two.
Thread Starter
Teching In
Joined: Feb 2012
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@PorkRoll,
It sounds like you’ve done a good bit of research on cams and came up with specs to suit you and your combo. If everything else checks out and you put either of these two cams in the engine, you’d barely notice a difference, if any.
Looking at the specs:
Your cam: 229/233 .600/.595 112.5+4.5
Titan 4: 227/232 .612/.595 113+4
We like to look at cams in terms of valve events since that’s what really tells the story. At .050", here’s how they break down:
Your cam:
IVO 6.5* BTDC
IVC 42.5* ABDC
EVO 53* BBDC
EVC -0.5* ATDC
6* overlap
Titan 4:
IVO 4.5* BTDC
IVC 42.5* ABDC
EVO 54* BBDC
EVC 0* ATDC
4.5* overlap
So really the differences are small. Your cam opens the intake earlier and carries a bit more overlap, which is going to cost a little idle vacuum and give it slightly more chop. The Titan 4 is just a touch cleaner there.
From a powerband standpoint, these are going to be very close. You’re not shifting the curve in any meaningful way, just changing the character slightly.
It basically just comes down to what you want out of it. If you want a slightly more aggressive feel and a bit more chop with specs you came up with, go custom. If you want something proven that’s going to act exactly how you expect, the Titan 4 is a solid option.
With the ported LS2 intake and 1.75" long tubes, the combo is already there. In a 951 chassis, either one is going to feel strong and responsive. You’re not leaving anything on the table between these two.
It sounds like you’ve done a good bit of research on cams and came up with specs to suit you and your combo. If everything else checks out and you put either of these two cams in the engine, you’d barely notice a difference, if any.
Looking at the specs:
Your cam: 229/233 .600/.595 112.5+4.5
Titan 4: 227/232 .612/.595 113+4
We like to look at cams in terms of valve events since that’s what really tells the story. At .050", here’s how they break down:
Your cam:
IVO 6.5* BTDC
IVC 42.5* ABDC
EVO 53* BBDC
EVC -0.5* ATDC
6* overlap
Titan 4:
IVO 4.5* BTDC
IVC 42.5* ABDC
EVO 54* BBDC
EVC 0* ATDC
4.5* overlap
So really the differences are small. Your cam opens the intake earlier and carries a bit more overlap, which is going to cost a little idle vacuum and give it slightly more chop. The Titan 4 is just a touch cleaner there.
From a powerband standpoint, these are going to be very close. You’re not shifting the curve in any meaningful way, just changing the character slightly.
It basically just comes down to what you want out of it. If you want a slightly more aggressive feel and a bit more chop with specs you came up with, go custom. If you want something proven that’s going to act exactly how you expect, the Titan 4 is a solid option.
With the ported LS2 intake and 1.75" long tubes, the combo is already there. In a 951 chassis, either one is going to feel strong and responsive. You’re not leaving anything on the table between these two.
Went with the Titan 4 at the end of the day, but I am putting together a large parts order with Summit and have gasket question. I’ll be measuring PTV, do you think a .040 gasket will be problematic?
On The Tree
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Posts: 106
Likes: 52
From: Akron, OH
@Summitracing
Went with the Titan 4 at the end of the day, but I am putting together a large parts order with Summit and have gasket question. I’ll be measuring PTV, do you think a .040 gasket will be problematic?
Went with the Titan 4 at the end of the day, but I am putting together a large parts order with Summit and have gasket question. I’ll be measuring PTV, do you think a .040 gasket will be problematic?
On my build, the rod/piston combo was flush with the deck after a light resurface of the deck and I used 0.036" Cometic MLS gaskets.
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Joined: Jan 2008
Posts: 2,230
Likes: 1,515
From: Ohio, Georgia, Nevada, Texas
@PorkRoll,
Excellent choice with the Titan 4, and thanks for considering us for parts for this build.
We like what you’re thinking, going with a .040" gasket. That will typically give you about a .2 - .3 bump in compression and help tighten up quench, which is generally a good thing on a combo like this. Like @Kubs said, you don't want to get quench too tight either. A lot of stock LS engines end up with the piston at or slightly out of the hole, so it is something to keep an eye on. As a general rule of thumb on a steel rod engine that will see 6,000+ RPM, we like to see quench in the .038" to .043" range.
With PTV, there is no way to guarantee clearance up front, so it is good that you are planning to measure and verify everything during mockup. Based on the 4.5* IVO of the Titan 4, along with an LS2, true flat tops, and 65cc 243 heads, it looks like a combo that should clear with a .040" gasket, but we wouldn't assume anything without checking it.
When checking PTV clearance, we recommend checking the intake at 8* ATDC and the exhaust at 8* BTDC. As a minimum, we like to see .060" intake clearance and .090" exhaust clearance.
Excellent choice with the Titan 4, and thanks for considering us for parts for this build.
We like what you’re thinking, going with a .040" gasket. That will typically give you about a .2 - .3 bump in compression and help tighten up quench, which is generally a good thing on a combo like this. Like @Kubs said, you don't want to get quench too tight either. A lot of stock LS engines end up with the piston at or slightly out of the hole, so it is something to keep an eye on. As a general rule of thumb on a steel rod engine that will see 6,000+ RPM, we like to see quench in the .038" to .043" range.
With PTV, there is no way to guarantee clearance up front, so it is good that you are planning to measure and verify everything during mockup. Based on the 4.5* IVO of the Titan 4, along with an LS2, true flat tops, and 65cc 243 heads, it looks like a combo that should clear with a .040" gasket, but we wouldn't assume anything without checking it.
When checking PTV clearance, we recommend checking the intake at 8* ATDC and the exhaust at 8* BTDC. As a minimum, we like to see .060" intake clearance and .090" exhaust clearance.