I dont wanna beat a dead horse but is a 274 cam possible?

274 or 264

  • 274 112lc

    Votes: 0 0.0%

  • 264 112lc

    Votes: 0 0.0%
  • Total voters
    0
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bigcatchdaniel555

Well-known member
What i mean is, is anyone running a 272/274 cam with a 112 lc in a slightly modified carb and exhaust 200 with a stock c4 ad 2.83 gears or would it be a dog. Even if the cam was degreed 4 in advance if not ill probably go and get the 264. Reason I am look at this now is cuz my tranny is slipping it needs a rebuild so I'm wondering about a cam something i wish I had done when i rebuilt the motor.
 
The two (cam and transmission) are rather separate issues, and given your gearing I think the 274 might be tough to run in an auto.
 
I'm running a 274, Holley 500, a 350 would probably be better (better Idle w/low vacuum), however if you tweak the 500 you will get better performance. I rebuilt a 1972 C4 myself, and think its fine. The biggest problem is idle. With really low vacuum caused by the bigger cam proper idle is about impossible, but I love the sound of the bigger cam.

The point is the I don't think the cam is the problem, I believe its the low vacuum with that cam. When an auto is in drive and you are at a stop or coming to a stop, the car stumbles and acts like its going to cut off. Just pop it in neutral, that's what you have to do to a straight drive anyway.
 
Classic Inlines have a couple of split-duration cams, a 264-274 and a 268-274.
Mike has recommended either of these with a 112 LC for cars with C4s.
 
mach1 mark":15pzxl0b said:
The point is the I don't think the cam is the problem, I believe its the low vacuum with that cam. When an auto is in drive and you are at a stop or coming to a stop, the car stumbles and acts like its going to cut off. Just pop it in neutral, that's what you have to do to a straight drive anyway.
Click to expand...
Do you have a 110 or 112 LC?
Are you using a double-roller chain with the timing advanced?
 
What Jack said which lc do you have I heard the 112 lc will help the drive situation. I have the holley 350 so tuning is possible for the carb if i go with the 262/274 I will use standard lifters but if I go with the 274 112lc then I would use rhoades to help vacuum. I dont run any power accessories I just like the lopey idle. Does your car still have reasonable power off the line I think any cam would be an improvement over stock.
 
I know I cant have cake and eat it too but the idea would be it would achieve a slightly lopeyer (if that makes sense) idle than the 264 and get the advantage of more top end power. They would both be advanced 4 degrees so the 274 should have a little more top end where the log chokes out. If this sound biased its because I feel that way I'm trying to vindicate the 274 for the idle and top end but Im not usre about the 112lc will it idle ok and get out of its own way in traffic. I dont wanna sound cross just wondering.
 
Daniel, i run a 274 @ 112 L/C, but i also run flat top pistons so my compression ratio "0" decked is over 10.2. I also run the camshaft 4 degrees advanced. 4412 holley on a direct log mount.
The key to a decent idle is the 2300 RPM stall converter.
I also run the 1.65 yella-terra full roller rockers.
I run 10 X 2=20 + 16 degrees initial advance for a total of 36 degrees @ 2800 RPM'S. I also run full vacuum advance at idle.
My cranking compression hot is still 190 psi.
If your engine specs are like mine run the 274, if not then run the 264-274 camshaft.
I just installed a 3.25 rear ratio & that brought the car to life.
Can't wait till the tracks open so i can give it a go. Bill
 
8) with the 112lc you will be fine. the wider lobe centers allow for a better idle and low end power, while maintaining the high end power you seek.
 
Daniel, before you make a desision you need to list what you have in your engine, and run some compression tests.
If you have an engine with only 9.0 compression you will loose a lot of low end torque. Remember with the 2.83 diff. gear you need all the low end possible.
Are you after sound at idle or best performance with the sound.

Rich the 112 lobe center will help his top end & a smoother idle, but a 110 lobe center will give him more low end torque + a higher cranking compression. With the 110 lobe center the idle will be more choppy.
Not the best deal with a stock torque converter.

Also do you want to run 87 octane & loose power or do you want maximium power??? Maximium power will require 93 octane fuel.

Your choice, a proper desision can't be made till one knows all the missing details.

Not trying to be picky, but do you want the best?? Bill
 
I appreciate all of you all's knowledge heres my motor so far. Holley 350 jetted dual exhaust pacemkaer headers going to true duals and duraspark with 9.3:1 compression so its pretty mild. Either way the cam will be advanced 4 degrees so it should move the power curve down a notch or two. I use premium anyway 93 octane down here. I would think that any cam unless its something really radical would give better power all around.However like I said I'm not the expert so I'm open to you people who are.Thanks
Dan-
 
Forgot the car will be used for daily driving not the track. If the 274 is not what I can use. What is the lowest lc I can use with my stock tranny in another cam to get the best lobe.
 
Dan, then go with 264-264 @ 110 L/C, advance cam 2-4 degrees.
2 degrees would be at 108 intake lobe center, 4 degrees would be at 106 intake lobe center when degreeing in camshaft. Bill
 
Dan, you don't want a 108 L/C on a vehicle with a stock converter.
The 264-264 110 advanced is what you need. The added low end torque will help pull that 2.83 diff. Bill
 
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