Topic: Lingenfelter GT2-3 Camshaft & Spring Kit

[bluedevil]

Extensive engine dyno testing at Lingenfelter has produced some of the best street camshaft profiles available for the LS1, LS6 & LS2 engines.  The Lingenfelter "GT2-3" camshaft was designed to produce excellent power while still maintaining a  smooth idle for automatic or six speed manual transmission equipped vehicles that can be daily driven.  Springs included are GM LS6 valve springs and should be used with the stock retainers and locks. 

Tests on the LS1-GT2-3 have shown 25-30 HP improvements over factory LS1, LS2 camshafts and this camshaft can be used in 350 CID - 427 CID applications.  This camshaft also works well in supercharged or turbocharged applications.

All Lingenfelter camshafts ground by Competition Cams to Lingenfelter specifications on induction hardened cores for exceptional durability and long life.

    * Model: L210125297
    * Manufactured by: Lingenfelter



Cam Number            Duration @ .050                 Valve Lift        Rocker Arm           Centerline
LS1-GT2-3                         207 / 220              .571" / .578"        1.7 ratio             118.5


As im comming to an end on my exterior mods,its time to mod the performance department in the AV.
My question is,..... is this suitable to our 325 CID?

http://chevyavalancheperformance.com/shop/index.php?main_page=product_info&cPath=280_281_282&products_id=497

[Richie_Rich]

Lingenfelter has been around for a long and make some great reliable HP.
It's too bad John died several years ago, but the company lives on.

I know a guy that has two Lingenfelter Corvettes and holy crap are they fast.

I'd trust anything from Lingenfelter.

[Main One]

Two thoughts come to my mind besides whether this will work with our slighter smaller than LS1 engines, which it should.

1.  This is a pretty good price, although you may want to consider also upgrading pushrods when doing this for another $100+.

2.  Why not go bigger (longer duration)?

Expanding upon the 2nd thought.  FlaBouy believes he and I are running the same cam design, even though mine's a Crane and his a DiVinci.  At 0.050, our durations are 216 and 224, both at 0.551 lift.  Knowing what I know now, I would be more tempted to go bigger than I did.  If I felt a higher peak lift number was called for in my application, I could go to 1.8 rockers vice the stock 1.7, so I would be looking for longer duration.

You of course are blown, and so is FlaBouy.  I believe he is very satisfied with his cam together with the blower.  For both of us, there is no idle or bottom-end issue, other than needing to bump idle speed up a little above the stock 550 rpm.  I think KY_Bob is at 600-something.  My lowest level is 700.

Bottom line, I think this would work in your application, and give you more power.  It's a lot of work to put in a cam so if you are going to go to the trouble, you may as well go with what is best for your application.  I forget the specs for Bob's cam - it may be very close to this Lingenfeltner.  His is not of as long duration as mine and FlaBouy's.

[MyBigToy]

I don't know enough about cams to give you an opinion but you should check out PT.net. There are a ton of threads over there about cams. I do know the GT2-3 is one of the cams that I've seen threads on and I believe Main One's comments follow the thoughts over there.

As an aside, I don't remember - have you done an intercooler or meth yet?

[MyBigToy]

I did some reading @ PT.net yesterday and saw many recommendations that the GT2-3 cam is good for a Magnacharger. I'd suggest you contact Lingenfelter, Crane (since they are out of business) and some of the other cam manufacturers/suppliers to see what they recommend. With your Vortec you will want to not lose any low-end torque in addition to adding better breathing up top. I would think your best choice would be somewhat different than for a Magnacharger. The cam manufacturers/suppliers will want to know as much about your application as you can provide - Vortec, 2600 stall, weight, intercooled, meth injection, nitrous, additional add-ons, etc). The more information you can supply, including what you want (hp/torque/combination of both, drag racing, stop-light runs, etc.), the better choice they can help you make. Keep in mind future mods also - if you ever plan to replace the heads, the cam choice will be different than with the stock heads.

I did find an interesting cam that was recommended by Vinci for added torque - thier Ultra Torque cam. It's good for 1500-5800 rpm, provides high torque gains, and doesn't negatively affect gas mileage/power. Specs are:

duration @ 0.004" 272*/280*
duration @ 0.050" 210*/218*
lift 0.551/0.551
overlap 48*
lsa 116*

This looks like an interesting cam for a Magnacharger. IIRC, on stock heads the valves start to float somewhere around 6K so it does leave a little on the table if you were willing to push things. I'm shifting at 5750.

I also read through Bob's thread @ CAFCNA (there's a lot of good info in it) and his cam is slightly different than Flabouy's/Main One's/GT2-3/this one. You might want to talk to him some also.

[MyBigToy]

Here's a link I found to some Comp Cams info that provides some pretty good insight:

http://www.compcams.com/Technical/FAQ/CamandValveQuestions.asp

And here's another sheet that gives a really good visual of cam terms:

http://www.compcams.com/Technical/FAQ/LSAproperties.asp

[bluedevil]

Thanx Joe for the links and info.  I will look into it

I think im doing this before the intercooler but nor sure yet.  The darn cooler is $1800

[MyBigToy]

Here's another link I found while looking around:

http://www.vincihighperformance.com/camshaft%20spec%20list%20page%20ls%20truck.html

The second cam is the one that I thought was interesting for a Magnacharger. The first one is the one that Flabouy's running.

Bob's running a 212/218 - 0.558/0.563 - 115 lsa

[bluedevil]

Here's another link I found while looking around:

http://www.vincihighperformance.com/camshaft%20spec%20list%20page%20ls%20truck.html

The second cam is the one that I thought was interesting for a Magnacharger. The first one is the one that Flabouy's running.

Bob's running a 212/218 - 0.558/0.563 - 115 lsa

Very cool thanx.   We should GTG and do CAM swaps

[KY_BOB]

Here's another link I found while looking around:

http://www.vincihighperformance.com/camshaft%20spec%20list%20page%20ls%20truck.html

The second cam is the one that I thought was interesting for a Magnacharger. The first one is the one that Flabouy's running.

Bob's running a 212/218 - 0.558/0.563 - 115 lsa

Yep, that's what I'm running.  I was scared of going too big, afraid that I would lose some bottom end.  I can tell you that I lost nothing, if anything, it's stronger now at 2000 rpm than it was before.

I don't regret my cam choice but I certainly wouldn't go any smaller/milder.  I considered the GT2/3 as well and ended up with mine.  Even though the lift is slightly less than the GT 2/3, the ramps on the Comp high lift series are much more aggressive.

IMHO, I would go with either the cam that I have or the one that Main One and Flabouy has.  If you have no intentions of changing the torque converter, probably the one that I have.

That said, the GT 2/3 isn't that much milder than mine, so it wouldn't be a bad choice and the price is right.