the_merv

iTrader: (88)

I stumbled upon an article...
http://www.gmhightechperformance.com...t/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.

Brian Tooley Racing

iTrader: (13)

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

My Platinum springs work great if using stock rocker arms.

litle88

iTrader: (20)

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

ramairws6

iTrader: (33)

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!??

Brian Tooley Racing

iTrader: (13)

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.

the_merv

iTrader: (88)

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

turbociv910

iTrader: (2)

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

My6speedZ

iTrader: (18)

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.

the_merv

iTrader: (88)

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

That's good **** right there..

My6speedZ

iTrader: (18)

fwiw.

the_merv

iTrader: (88)

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

Brian Tooley Racing

iTrader: (13)

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.

the_merv

iTrader: (88)

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..

Brian Tooley Racing

iTrader: (13)

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. You can check them out here. http://www.briantooleyracing.com/660...l-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.

ramairws6

iTrader: (33)

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

the_merv

iTrader: (88)

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

litle88

iTrader: (20)

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

Brian Tooley Racing

iTrader: (13)

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.

litle88

iTrader: (20)

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?

Brian Tooley Racing

iTrader: (13)

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.