I have a 350 LT1 with LE2 heads and rebuild bottom end, 4000 stall and 4.56 gears. Right now I'm running a 248/252 on a 110/106 centerline and its WAY to big, the car is a dog off the line and never really gets into the powerband till around 6000rpm. I'm in need of some help picking a new cam right now I'm leaning toward the lunati 60121 which is 219/227 on a 112/106, but I dont want the cam to become a restriction to the motor b/c I do spray it with a 250 shot. The other cam I'm looking at is a 231/239 on a 110/106 it still seems kinda large for a 350, and not to mention its going in a 3900lb Impala so I need all the low end I can get. I'm really starting to think that alot of people are overcamming there LT1 just to get that peak power number and give up good ET's for that reason.

Jason

 

One of the most popular cams for the LT1 is the GM 847 cam. Another good one is the CC306. These are 234/242 and 230/244 respectively both with very conservative lift numbers. I don't know how much more torque you'd need but that weight is not much more than what the F-bodies weigh. If you really want max performance from that setup I'd get Bret Bauer to design a cam for you to work with your LE2 heads. That is a large cam you have now. I'd also think you should run a wider LSA for that much nitrous, but that's just what I've read.

 

Cant go wrong with a custom cam. Gonna cost you a little more but for the added power and powerband I wouldn't do it any other way.

 

My choice would be the LE3 cam for that, it's going to get all the midrange back that you lost from the monster that you put in there, which is WAY to big for even a 383.

Bret

 

I have a 355 lt1 11.6.1 cr , heads flow 240int. 196 ex. , I havve a cc306 cam, at 3500 rpm the car comes completely alive until 6600, I like it , I talked to loyd elliot and he said the cam would be excellent with what I have and a 250 shot, just to giive you an idea

 

depending on where you wanna shift, something in the 230-236 intake duration range will work.

If you wanna shift above 6800 RPM, you might consider slightly larger but a mid 230 duration should handle a 6500-6800 RPM shift point and still have the TQ to propel the car with 350 cubes.

Most need to know this is a B body (as stated in first post) with a TH 350/400 and 2.52 1st gear (NOT 4L60 with .306 1st gear) and probably running 28-30" slick therefore offestting the 4.56 gears effectiveness.

Some might recommend something different with out this info as opposed to thinking it is a F-body, 4L60, 4.56 gears and 26-28" tires.

Just making sure most people know more about the set up so they can make a better cam recommendation for you.

 

Get a cam like mine. I love it. 230/236 510/520 with 1.5 rr's. Great power from about 3000 to about 6500.

 

here is the cam i have
comp cams cca 07-466-8
specs are:
Operating Range: 1800-5800 RPM
Duration Advertised: 268° Intake / 276° Exhaust
Duration @ .050'' Lift: 218° Intake / 224° Exhaust
Valve Lift w/1.6 Rockers: .570'' Intake / .565'' Exhaust
Lobe Separation Angle: 113°
to me this is a good all around cam for town and track.
some guys on this site will call it too small but i like it!

 

This is a light Imp @ 3900lbs, some LT F-Bodies are pretty close to that, right Lloyd;-)

A 306 is not going to make the TQ that a real cam would make. Normally that's down 20 ft lbs of TQ on a 350, so it's really old news. You also have to take into account the 250 shot, that is going to change the duration needed in the motor.

Bret

 

had no idea this B body was that light . . . . .

3900 lbs. . . . . . . DAYUM.

My 3820 lb F body is pretty much a B body with a lil better aerodynamics I guess.

 

I had a LE2 cam but a lifter spun and took it out, but I ran that combo with 3.08's a 4l60e and 26' slicks to a 13.4 at 104mph vs now I run 13.4's at 101mph on 30's slicks. Do you think the lack of gearing on the LE2 cam hurt as much as 1 second et and 8-10mph? I'll spin it to where ever anyone tell me to just so long as its fast right now I shift just before the PCM goes blank at 7200. I'm losing everything in the 1/8 I'm only hitting 80mph at that point and pick up 21-22mph on the big end, which is the same most low 12second bbodys pick up. So some one help me find another 10mph in the 1/8!!!

Jason

 

I sent you a PM reply on all of this but....

Your cam vs. the LE2 you had previously is down about 40ft lbs of TQ at the 4000rpm stall. That would account for the bad 1/8th mile MPH and ET.

The other end of this is what you have done to the drivetrain, the gears (4.56 from 3.08's), tranny(TH350 from a 4L60) and stall (4000 from 3200) along with the larger tires should add up to a 1/2 second gain with the same cam. You gave back all that gain with less power. The reason it does well in the back half of the track is because you are making so much power from 6500-7000rpm but getting you there is the problem.

Now a LE3 cam would be better for your new setup over the LE2 cam, but either one of them would walk all over that 248/252 cam.

Bret

 

PM sent back...and remeber street manors are out the door on this one lets go stock eliminator!!!