I have decided to swap my cam on my GTA. My choice is the Lingenfelter 74216 cam, 216/218, .493/.501 (1.6 rockers), 112 LSA. I wanted to keep my low end torque and keep my whole TPI setup. Many articles that I read suggest to keep the duration on TPIs between 210 and 220, so I have that, and the lift close to .500, I have that too. I am planning on doing a valve job (3-angle, 1.94") on my 305 heads and a mild port job. I am NOT going to siamese since I want to keep my low end.

Q: You guys that have this cam, what results did you get after the swap?

-Ozzy

Here is my dyno sheet: http://home.earthlink.net/~ozvresto/GTA/dyno1sm.jpg

My Mods:

INDUCTION
K&N Air Filter, Modified Air Box, Modified MAF, Jet Throttle Body Airfoil, Ported Plenum

COOLING:
Modine Radiator, Flow-Kooler Water Pump, 160° Thermostat, Hypertech Fan Switch

PROM:
Hypertech Termo-Master

IGNITION:
MSD 6A, MSD GM Blaster Coil, Holley Annihilator 9mm Cables, Splitfire Spark Plugs

LUBRICATION:
Mobil 1 Synthetic Oil

EXHAUST:
Edelbrock TES Headers w/3" Collector, Catco Catalytic Converter(3" in/out), Flowmaster 3" Catback w/American Thunder 80 Series Cross-Flow Muffler

FUEL SYSTEM:
Crane Adjustable Fuel Pressure Regulator

ENGINE/MISC.:
March Underdrive Pulleys (crank, water pump, alternator), Cloyes True Dual Roller Timing Chain, Scorpion 1.6 Roller Rockers

TRANSMISSION:
Newly Rebuilt 4L60, TransGo Shift Kit, New Valve Body, Throttle Valve (higher than OEM downshifts), Corvette Servo, 2500 Stall Converter

 

where your dyno pulls with all the mods you have listed above?

181hp and 276tq?

 

Yes it was, but the 305 still has Mr. Peanut for cam.

 

FWIW: I had that LPE cam in a 350 L98 (daily driver) with LTR for a while. It passed smog with no problems; was an improvement over the stock cam; and ran with the stock SD ECM program - although not very smoothly. In mine it didn't come up into its power band until ~2800 rpm, and even with the large runners in the TPI intake, it was all done by 5000 rpm.

If it helps, here's a record off my WB data logger - it's a 2nd gear rolling-start street pull, showing rpm vs. time. If you follow the gray line you see it starts off idling along until the throttle is dumped open, then the converter flashes to ~2400, the curve goes a little flat until ~2800, then there is a smooth power increase that goes up past 5000. (Blue line is the WB reading of AFR.) The cam worked well for me, and I won some autoX events using it.

I recently changed the LPE216 out for a HotCam that breathes a lot more above 5K. HTH

 

Thanks for the info DoctorJ, that helps some. I am driving this car every day to work too so anything past 5K is not really that critical.
Anyone else?

-Ozzy

 

It's not going to be as tame in a 305. I would stick to somthing with around 210 degrees on the intake side.

 

You're saying that 216deg of duration will be on the high side. Why? What is it going to affect if I am still within the desired range?
Note: I have MAF system and plan on getting a custom PROM?

-Ozzy

 

The Lingenfelter 216 cam is garbage. It is outdated and does not work very well with TPI. You'd be much better off with the LPE 211 cam for your TPI setup. This cam has much more aggressive ramps than the 216 which will give you a smoother idle and more power across the curve. The only guys I've heard of running the 216 cam until now were vette owners and all of them hated it. Go for the 211 cam if you intend to keep the TPI setup for awhile. Look at Mike Crews post in the Aftermarket Review forum for details on this cam. You can't miss it.

 

Same cam + less cubes = less tame. The operating range will be higher in a 305 than it would in a 350. Doctor J was making power up to 5000 rpm with large tube runners in a 350. If your going to keep the stock base and runners I would stay around 210 degrees, the LPE 211 is a proven performer in a L98.

 

Sounds fair enough. Now the specs for the LPE 211:
211/219, .536/.560 (w/1.6), 112 LSA
I hate to have to buy new rockers. I was planning on reusing my Scorpion Rockers (1.6) but with the 211 the lift seems high. With a set of 1.5s it will be .503/.525 which seems better for a TPI.
Just can't seem to win!!

-Ozzy

 

Don't worry about high lift with TPI, the intake likes it, it's the heads that won't. You really need to get rid of those stock heads to see a decent gain from the cam swap. At least get a set of vette heads and have them worked over. If you're going to be going to the trouble of putting in a cam I'd HIGHLY recommend swapping to a 350 engine. There's no amount of emphasis that can be put in words about how much better your car will run with a cammed 350 compared to a 305. Just think a 350 can flow about 15% more air which means it is capable of making that much more power. You can find a 350 roller block for fairly cheap and you could throw your tpi setup on it. This is JMO, take it for what it's worth.

 

Yeah. I know the 305 in my GTA is a handicap but I'll have to live with it for a while longer until I can put in a 350.
I can get the heads worked fairly cheap and I will do some of the work myself. So a new set is not really in the works, but I wish I could get a set of Corvette heads though, maybe later.
How much lift is too much lift on the 305 heads before I have to worry about the valves hitting the piston. I know this may vary depending on the valve timing but what is a general rule?

-Ozzy