Hello

New to Moparts

Could anyone suggest a replacement cam for a 1974 Roadrunner 400 "P" code motor? I don't want to change the factory rockers or pushrod length if I don't have to? I see Sealed power CS-661 or kit KC661 with lifters, or Yearone MP31, Comp Cams 21-212-4. Cannot seem to find the exact specs of the original. Heck, what would Worman use? Also anyone use the Sealed power rockers or arms (vintage)

Thanks

Welcome welcome. You might checkout the Summitt house brand cams. they're cheap & have a good rep for what they are. the specs would be listed there. I have one (not installed yet tho).

You can actually go with quite a bit of cam before you have to change rockers or pushrods. I don't have my factory service manual in front of me, however I think the factory cam was roughly 210* @050 and .430 lift. The lunati voodoo 10230700 would be a good approximation with a little extra lift.

welcome to the jungle ! now you know where to spend all your free time !

If you find out what the specs are on the cam for your 74 RoadRunner with 400 motor, most major cam companies will grind you one to those specs for just a few dollars extra. They may even have the stock specs for that cam on record. Just give one of them a call. Crane, Comp Cams, Lunati, etc, etc.

I agreee Summits brand cams work great and are reasonable.for close to stock use the smaller one.Ive run all their Mopar cams and a few Checvy ones.No problems.The big cam is a bit lumpy but not radical.smaller one is just a bit over stock and all OE parts work great and idles almost like stock with a bit more power.Rocky

http://howardscams.com/i-24079963-howard...lifter-kit.html

a little hotter...

http://howardscams.com/i-24079922-howard...lifter-kit.html

Comp Factory Muscle cam for bigblocks, it's like a revamped 440HP camshaft, should slot in with no other substitutions.
http://www.jegs.com/i/COMP-Cams/249/CL21-305-4/10002/-1

It's a little hotter than the Crane 680101 Factory Blueprint camshaft, the Crane has lift and duration very close to stock but the lobe profile has been smoothed out using computers.

Lunati's Voodoo series the 10230700 is actually smaller than the factory HP cam, the 10230701 is nearly identical to the factory HP cam but with modern lobes that will get more airflow.

Last but not least I'd suggest the Crower 267 HDP. It is a tiny bit bigger than the other three. It seems to be a very satisfactory camshaft, we have gotten good reviews on it.

The 271 HDP and the Summit larger cam are too big, the summit smaller cam is too small. The four cams listed above should meet your needs and not make your car undriveable with stock drivetrain.

Good Luck!

R.

Thank you all

This is all great info.

Just got home so will research the above.

Thanks again for all of your help.

Still searching for original specs. Found this. Very interesting. Only gives part of the specs. though.

http://www.allpar.com/mopar/V8/400.html

Still want to know what Worman would use LOL

Another piece of the puzzle.

www.dodgecharger.com/forum/index.php?topic=62851.0

Your SCR might be fairly low so I would stay conservative

Your right

How about Howard's 727511-13 or CL727511-13

Looks like very similar to original and I assume I can use all stock valvetrain.

We just got the milder Howards .434 lift cam for a 383.It will be a while for results as it turned into a complete engine rebuild...
RT

Welcome to Moparts!
You have my reply on FBO.
Someone here might know the valve spring specs that come with the AeroHead cylinder heads?

I found it. Original cam is 3512907

https://www.scribd.com/doc/24470110/B-RB-ENGINE

Unfortunately the exact specs for the factory cams seems to be unavailable, at least to the average guy. I'm sure there are guys that have been doing this forever that know the specs or have measured factory originals. The problems with any of the published factory specs (service manual, DC manual etc.) is that they don't specify at what lift the duration numbers that they list are at. And without that info your guessing. From what i have seen that is available, the crane 'blueprint' cam is pretty darn close to factory specs. But that's for the HP cam. You'll probably be able to find max lift and LSA specs, but the duration specs are going to be a chore to find. Good luck and keep us posted.

Are you looking to "replace" the original cam, or are you wanting to "upgrade" the original cam?

If your motor has the "2bbl" cam, it probably doesn't have the hp springs either, which would hinder the options unless changing them was part of the plan.