Hello Everyone,

I recently picked up an Aluminum 6.0L (I would assume its a LS2) that was used in a 4 person Sand Rail, from my local speed shop (MC Racing in KS).

The Sand Rail owner decided to go with a new Tall Deck LSX block from GM and had it built to run a Magnuson style supercharger on pump gas and it put down a traction-limited 892 rwhp on the dyno.

With the new LSX motor in the Sand Rail the owner had no use for the previously installed Aluminum 6.0L (LS2 ?) that supposedly dyno'd over 700 rwhp running the same Magnuson style supercharger, on race gas. He was basically giving it away so instead of building my current LS1 swap, I decided to buy the LS2 from the Sand Rail customer (and will be selling my LS1 shortly).

Upon review of my new purchase we realize that it has nicely ported LS6 (243) heads, with Shaft-Mounted Rockers, and some beefy Valve Springs (unsure of the brand). After digging a little further we notice it has Forged JE Pistons (somewhere around a 7-8mm dish and fly cut valve reliefs cut in them), a Forged Crank, ARP Head Studs and Rod Bolts.

The Heads and Engine are both out getting freshened up (pressure checked, cleaned, new bearings ect), but while it's out I wanted to get some recommendations on what cam to go with. I am going to run a LS6 intake, and reuse my long-tubes. I know there are different types of "lobes" that cams can be made on, and know that some lobes have a more "aggressive" ramp rate and are harder on the valvetrain as well.

I would like to know about your personal experiences (Dyno #'s/ ET's) with some aggressive type cams (MS4, T-Rex, LG G5XE, ect ect) in a 6.0 L LS2 with 243 heads and is there a "Large Cam" that has the Duration and Lift of some of the "Aggressive" cams but that are running the Less-aggressive type of Lobe ?

The car will be my 1978 Caprice 2-Door Coupe, with a TH350 that is shown in my signature, and used primarily for the drag strip, with occasional trips to the local cruise nights.

Thank you in advance for sharing your personal experiences (Dyno #'s/ ET's).

- Henry

 

Why would you put on a LS6 intake on a LS2? Just put a ported LS2 intake or a FAST on there.

As far as cams go I have the VRX5 and it's awesome to say the least
236/238 .601/.605 113 LSA

 

LS6 for cable throttle body and flows marginally better than LS2. That's what I would do in a retro swap. Much easier install.

 

The duration and lift look like something I would like. What kind of Dyno #'s or ET's did that Cam provide?

You are absolutely correct, thank you!

Dyno Thread: Stock LS6 Intake vs Stock LS2 Intake: http://www.ls1gto.com/forums/showthread.php?t=289456

 

Try Ed at flowtech he has some bigger stuff with better lobes and ramp rates.

OR

contact Patrick G, and ask him on the newer ECS lobes.

 

if it has dished pistons and was used with a supercharger, it probably has low compression... u should address that 1st before a cam... unless u want to use a supercharger also, then low comp will help u...

 

There is a lot of buzz right now about Geoff Skinners new lobes from Engine Power Systems (EPS). They are like a marine endurance lobe and easy on the valvetrain but put up numbers like a much more agressive X-ER, LSK lobe etc... The other lobe I would look at is the the Comp LSL lobes that are in Comps LSR line of cams. They are only marginally more agressive than the EPS lobes from what I understand. Both of these lobes are so easy on the valvetrain even at over.600 lift they are compatible with beehive springs which is a really great IMO. There are a lot of advantages to a beehive if you can get away with running them.....

 

Excellent feedback guys, keep it coming!

I am learning a lot, thank you !

 

I think you would do well with the RPM 3 cam from Fran.

This will help.

http://www.youtube.com/watch?v=PtOPy_lp2QY

 

Nice to see some ET proof !

What lobe is the RPM 3 cam made on and what are the specs of the cam ?

 

I fully agree. If you are keeping it NA, you will want more compression. Stock CR on an LS2 is 10.8:1. My new (pump gas) motor is about 12:1. A cam in the mid 230/ low 240 range and .600 + lift would be a good selection for a street/ strip motor. If, however, you are going to go FI, the cam selection would need to be made accordingly.

 

The people at MC Racing has told me that with the current slightly dished pistons and the Milled LS6 heads that it should be a Pump Gas friendly 9.5:1 or so.

 

9.5 to 1 might be good for an old sbc but not a ls2.

If your going to stay NA, put some flat tops in it with valve reliefs, That will get you in the 11 > 12 to 1 area.

 

Just think of it as a 6.0L LQ4, since it will have around the same Compression Ratio as one, but with much better flowing heads.

I spoke with Geoff at EPS and he will being sending me a Cam package that he recommended to me for use with this set up.

He said it should run very well on the crappy 91 octane that we have here in KC.

 

Not sure on the specs, contact Fran @ 3027984000

 

That Vette could pick up some et if the *** didn't almost hit the ground after nailing second.

 

That cam is a 236/236 601. 609. lift with a 113+3 lsa.

I talked to fran about that cam I'll be gettin it for my goat in a few months.