T-Rex cam

[Mazdarider]

What is the opion of anyone out there on the T-Rex cam, Lingerfelt 243 cast number heads, and the Lingerfelt cam? Is a 215cc head to big or should i go with the AFR 205cc?

[Mr. Luos]

Drag?
Street?

I think the T-Rex is a little big for a street car.

[Morley]

If this is going to be a daily driven car then the heads are way too big and so is the cam. For street use you want 195cc intake runners and a cam with 112-114 LSA with less than .520 lift, closer to .500 lift or less would be better.

[Mr. Luos]

Morley...that is basicly stock LS1 heads and cam. Heads aren't that big, but they are somewhat close.
Stock LS1 cam is right at .500 lift.

224/224 581/581 114 is my idea of a perfect streetable cam in an LS1.
AFR 205's would go well with that cam in my opinion.
Still, call Thunder/TSP and talk to them first.

[Morley]

Originally Posted by Mr. Luos

Morley...that is basicly stock LS1 heads and cam. Heads aren't that big, but they are somewhat close.
Stock LS1 cam is right at .500 lift.

224/224 581/581 114 is my idea of a perfect streetable cam in an LS1.
AFR 205's would go well with that cam in my opinion.
Still, call Thunder/TSP and talk to them first.

Well, he didn't specify what engine so I assumed a Gen I SBC. The LS-x engines are a different animal and the same rules don't apply to them. Still 215 intakes would be allowing the incoming air to slow too much unless you are always running in the higher RPM range, and have an exhaust able to get rid of all that air as well.

[Mr. Luos]

True.
I heard T-Rex and knew it was an LS1 grind. I shouldn't have assumed.

Thunder Racing Custom Camshaft
T-ReX v.2 - 242/248 - .608/.612 - 110 lsa 3500-6700 RPM Power Band. Violent mid-range & high RPM power. Requires computer tuning, 4000+ converter on autos, 4.30's or greater depending on transmission. Works very well with nitrous and proper tuning. Due to the fast ramp rate of this camshaft, the use of 1.8 rockers is not recommended. Due to the extreme nature of this camshaft, piston to valve clearance must be verified when using modified cylinder heads.

From Thunder's website.

That is a very large cam for a stock cubed LS1. Piston to valve clearance gets pushed a little too close for me. Not sure of the exact amount of clearance, but it isn't enough for my liking.

[Mazdarider]

Yes it is a Gen-III SBC 346 LS1 to be exact come on I've never seen the T-Rex on any other GM vehicle. But no its not a daily driver, its a strip car, mostly but one I take to a classic car gathering on occasion. The T-Rex is what i'm going to run but someone at the strip was bragging about the Lingerfelt cam gains of over one hundred hp. I call bullshit but if its true that will go in, but the heads i have not decided on, 205, or 215cc AFR heads, I'm not sure if the 215 are to big or not, I've heard different things from different ppl. So if anyone really knows and isn't just slinging some bs i'd like to know. I don't mean to be rude but some ppl just hear some phrases and get on hear and repeat them to try and sound smart.

[Mr. Luos]

What are the specs on that Lingenfelter cam? 100 HP is a HUGE stretch. Sounds like an SLP claim.


And I think it is 205 or 225 on the AFR Mongoose heads. Probably want the 205cc heads if it is stock cubed.

What gears are in the car? M6 or A4?
What are the goals? ET and power wise?


And just an FYI....the LS1 is a GenIII SBC.
And I try not to sling much BS...but it happens.

[stieh2000]

Originally Posted by Mazdarider

Yes it is a Gen-1 SBC 346 LS1 to be exact...

Out of curiosity, where did you get that Gen 1 from? The LS1 is a Gen 3 engine.

[Morley]

If it is a strip only car (running 5-6k RPM for most of the time) and you have a very large exhaust, then the 215 heads may be just what you need..if you have a modified inlet tract..ie intake, throttlebody, breather inlet tube/ CAI. WIthout those higher flowing items, larger heads won't get fed the air they want/need.

And 100 HP gain just on a cam change...not unless it had the wimpiest cam GM made in it to begin with.

[Mazdarider]

Originally Posted by stieh2000

Out of curiosity, where did you get that Gen 1 from? The LS1 is a Gen 3 engine.

TYPEO SORRY

[Mazdarider]

The car only gets driven on occasion to a hot rod gathering, it has a 4.10 gear, and a full set of bolt ons the only thing left is the heads, cam, and the new intake manifold-FAST 90mm with the nick williams 90mm throttle body. It has no cats 3in exhaust. Magnaflow cat back, Zex nitrous 125 shot, maybe going to upgrade to a 150.

[Mazdarider]

Also I was wondering what you think of the Magic Stick 3 and 4

[Mr. Luos]

Those big cams NEED the 4.10's you have.
That is a lot of cam. They make great power. Sounds like you are fairly set-up for one though.

I would call TSP/Thunder and talk with their tech guys and let them know what you have planned. Might recommend something smaller with more separation between the intake and exhaust duration to assist with the nitrous.

[Mazdarider]

From what I have read the T-Rex works very well with nitrous. I have spent hours on the computer looking through articles, and looking on different websites. So i guess thats prob. what I will run, with either the AFR 205cc or the Trick Flow 205cc heads, but the FAST 90mm in take and the nick williams throttle body 90mm. I will also replace the rear end with the moser 12 bolt, and my clutch with something I have decide what yet, also torque arms and verious other suspension parts. So it will be upwards of 6-7 grand including the labor cause i sher as hell aint puttin in that damn rear end, or those heads