Dynamometer Results & Comparisons - Comp LSR Cam

I stumbled upon an article...
http://www.gmhightechperformance.com/tech/lsx_engine/1008gmhtp_408_engine_build_on_a_budget/viewall.html

Where the Comp LSR Cam, 251/267, .624/.624, 115LSA was used.

Has anyone worked with this Cam? How did it perform? What are some good valve springs to support this?

Thanks. :)

I used it in my N/A 454 that made 705 hp.

My Platinum springs work great if using stock rocker arms.

Comp suggested using their 925/926 springs with that cam. I have one of those LsR and use the 926's.

I stumbled upon an article...
http://www.gmhightechperformance.com/tech/lsx_engine/1008gmhtp_408_engine_build_on_a_budget/viewall.html

Where the Comp LSR Cam, 251/267, .624/.624, 115LSA was used.

Has anyone worked with this Cam? How did it perform? What are some good valve springs to support this?

Thanks. :)

I have the first cam in that article. Seems to be a good performer. Hmmm, i wonder if i shouldn't have opted for this one instead by the looks of it!??

Comp suggested using their 925/926 springs with that cam. I have one of those LsR and use the 926's.

The 926 springs have too much open pressure if using stock rocker arms and will damage valve tips long term if used in a daily driver application.

The 925's are a better choice if using stock rocker arms. If you look at my Platinum springs and the 925's I think you'll see some stark similarities. :nod:

How agressive are the lobes on this cam? I think I found the one that is the next size lower. Car isnt a daily driver..has stock rockers tho.

247/263, .624/.624, 114 LSA, Comp LSR Cam # 54-473-11

has this cam in a stock bottom end c6z with heads/fast intake manifold and nick williams 102 tb and made 588rwhp

How agressive are the lobes on this cam? I think I found the one that is the next size lower. Car isnt a daily driver..has stock rockers tho.

247/263, .624/.624, 114 LSA, Comp LSR Cam # 54-473-11

They use LSL if I'm not mistaken LSR is a series of cams not a lobe.. They are supposed to be easier on springs than XER lobes and more stable while being soft on/off the seat and was designed to be stable while still offering decent lift but not being as aggressive as the LSK lobes. Some people say they are great, while some people say they make similar power to XFI lobes. I don't really know, I don't work in a shop; and I don't see a ton of different combo's. Someone with more valvetrain expertise will be able to tell you more.

I currently have PAC .650 Springs.. Pretty much on the fence with them springs and the cam that I posted.

has this cam in a stock bottom end c6z with heads/fast intake manifold and nick williams 102 tb and made 588rwhp

That's good shit right there..:cheers:

i run 918s on my lsr cam, but only because my valvetrain is very well setup and tested. The 26926 is the new dual spring designed to work with the lsr line of cams.

exactly. If you are running heavy solid stemmed valves, it's best to run a quality dual valve spring with lsl lobes. If you have lightweight valves and rockers, a good beehive like a comp 26918 or pac 1518 will control the lsl lobes.

Most people will need to run duals.

fwiw.

I'm not exactly sure what PAC ones I have..

I'm not exactly sure what PAC ones I have..

Do you have the PAC springs made for TEA like failed on your heads before? I would replace those as soon as possible. My Platinum springs are $129 shipped and have never failed. They are a drop in installation with your existing components.

Yup I have the same ones. The current cam in the car is pretty mild so ofcourse no issues.

What springs are you referring to?
I've been looking at the 926's..

Yup I have the same ones. The current cam in the car is pretty mild so ofcourse no issues.

What springs are you referring to?
I've been looking at the 926's..

My Platinum springs are the most durable springs that I've found in my 15 years of building LS cylinder heads. As you may know I'm the former owner of Total Engine Airflow so I have some experience under my belt. :nod: You can check them out here. http://www.briantooleyracing.com/660-lift-platinum-dual-springs.html

Whatever you do, don't run more than 400 lbs of open pressure if using stock rocker arms. Too much open pressure can damage the valve tips long term.

My Platinum springs are the most durable springs that I've found in my 15 years of building LS cylinder heads. As you may know I'm the former owner of Total Engine Airflow so I have some experience under my belt. :nod: You can check them out here. http://www.briantooleyracing.com/660-lift-platinum-dual-springs.html

Whatever you do, don't run more than 400 lbs of open pressure if using stock rocker arms. Too much open pressure can damage the valve tips long term.

I thought the PAC 1521's were an excellent spring? What happened to that now??

Ah good stuff sir..I may be giving you a call..:)

The 926 springs have too much open pressure if using stock rocker arms and will damage valve tips long term if used in a daily driver application.

The 925's are a better choice if using stock rocker arms. If you look at my Platinum springs and the 925's I think you'll see some stark similarities. :nod:

Sorry I meant I'm using the 925's. The car is not a DD but it is only a weekend car. What should I look out for? As far as valve tips are concerned? Do you have any pics of damaged valve tips? Do you have any tips?

Thanks
Zeke

Sorry I meant I'm using the 925's. The car is not a DD but it is only a weekend car. What should I look out for? As far as valve tips are concerned? Do you have any pics of damaged valve tips? Do you have any tips?

Thanks
Zeke

I do have a couple of pics of stock LS2 heads run with a LSr cam and 26926 springs, although the quality isn't the greatest. These were from a otherwise stock C6 LS2 using Comp cam, lifters, pushrods, trunnion kit and 26926 spring kit.

The valve tips should be flat and smooth, just like stock. With too much open pressure they will start to pit, look uneven, and eventually will stop rotating and have trenches cut into them.

The things that will help prevent these issues is running .630" lift or less with stock 15 degree rockers, running 400 lbs or less open pressure, running stock locks which allow valve rotation, and any type of oil additive that helps flat tappet cams prevent wear. Such as racing oils with zinc, etc.

Obviously running roller rockers will prevent this wear, but the heavier roller rockers need increased spring pressure and increased pushrod rigidity.

http://i67.photobucket.com/albums/h290/Brian_Tooley/DSCF4826.jpg

http://i67.photobucket.com/albums/h290/Brian_Tooley/DSCF4829.jpg

Ok I use valvoline vr1 20-50 non synthetic, I have the trunion upgrade and my cam has .624 lift in it. But I do have 405lbs of seat pressure open. Suggestions, recommendations?

Ok I use valvoline vr1 20-50 non synthetic, I have the trunion upgrade and my cam has .624 lift in it. But I do have 405lbs of seat pressure open. Suggestions, recommendations?

You're running good oil with the zinc additives, and I think with 405 lbs open pressure you'll be OK. Just pull a couple of rockers off every winter and make sure the valve tips look OK.

Thanks for the tips! I will do that sir.

Thanks for the tits! I will do that sir.

??WTF!? Hahahahaha :jest:

Lmao!!! Sorry about that! Damn autocorrect! I meant tips sir

Thats mean the cam when selecting should apply the recomendation provided of lower 0.630"

Brian I'm glad you found this thread and are spreading the word!

Take it from Brian guy's he knows what he is talking about, we sell his springs also for this reason.

I see guys get the LSr LSL thing mixed up all the time too as LSr is not a family of lobes just a line-up of cams from Comp.

I'm still on the fence about this cam, trying to figure if this would benefit me as far as cost vs gain.

I spoke with Brian about it..the GM article is pulling strong numbers..question is if mine would do the same.

You got a link to the article? Is it the one they were using to compare intakes?

Refer to post #1..
I stumbled upon an article...
http://www.gmhightechperformance.com/tech/lsx_engine/1008gmhtp_408_engine_build_on_a_budget/viewall.html

Anyone else have any insight into this cam? I see it bring a gain over the current EPS one I have..it's spec'd for a 6.0..

Anyone else have any insight into this cam? I see it bring a gain over the current EPS one I have..it's spec'd for a 6.0..

If you want to go over some options just shoot me a PM, e-mail or call me at the shop.

Will do.. I tried calling there earlier..everyone is busy..:)

Will do.. I tried calling there earlier..everyone is busy..:)

Really?

I apologize if that was the case. In the past 2-3 months we have just exploded with business. We had over 25 cars all having extensive modifications performed to them over that period and just got about 10-12 out the door last week and the week before only to get 4-5 more in this week and 4-5 more in next week.

We are really blessed with business, but it really gets hard to remember all the screen names and real names that call me everyday. Waking up to 25+ emails, 10+ PM's and 8-10 voice mails each day is great, but at the same time very draining! Enough complaining though lol!

Business is a good thing..lol. I just work on mine in the garage so workload isn't too bad..beer in the fridge isn't too far away..:)

Business is a good thing..lol. I just work on mine in the garage so workload isn't too bad..beer in the fridge isn't too far away..:)

How I miss those days...when life was easy....;)

Just kidding, I wouldn't trade it for the world even on the bad days.

Life isn't easy when you have a car not making the power it should and trying to figure out why..lol

I sent a pm to ya..;)