Techical Discussions => Tech- - Engine => Topic started by: Guests on March 26, 2009, 04:17:11 AM

Title: Cam Selection
Post by: Guests on March 26, 2009, 04:17:11 AM
I wanted to see if anyone might have a good recommendation for a good cam for my 1970 T&C with the 383.  Looking for some more power but nice idle.  Basics: dual exhaust, 4 barrel, etc. 
Title: Cam Selection
Post by: Stitcherbob on March 26, 2009, 07:36:36 AM
The original Roadrunner cam package from Mopar (restoration cam) would be a good choice for that engine with no major modifications.

Title: Cam Selection
Post by: Steve on March 26, 2009, 12:35:31 PM

It depends on what you want to do.  Apparently none of us are really good cam specifiers.  (
I asked a similsr question a few weeks ago.  Our man Stan founf this free download.  I found it very useful.  It's a spin off of the Desktop Dyno.
See if that helps you.
Heck. . .We know how to fix 'em.  What do we know about hot rodding? (
Click on the link in the quote and see if that helps.
There is a guy that is real good at this, HemiFury.  You can PM him also.  I suggest you attach a link to the thread with it
Title: Cam Selection
Post by: Leaburn Patey on March 26, 2009, 08:25:20 PM
Comp Cams 260H (or one of its variants) is a good choice.Slightly longer duration,but no silly high lift.
You can run it with stock torque convertor-and with your 4bbl/duals.
 Good bottom end and decent MPG.
Like Bob said,the factory  cam is good also.# P4452783 used in resto 383 and 440 HP engines.268/284 duration  .450/.458 lift 46 overlap 115 centerline
I am running Mopar Performance Purple Shaft #P4286675 260/260 duration,.430 lift.34 degree overlap with 113 centerline.
Has GOBS of torque,smooth idle (with a hint of a cam!) and still has lots of vacuum to run all the accessories.
If you are running 3.23 gears or lower (3.55,3.91,etc.), I would recommend going up one step in convertor.166K  #P4876878 has a 2250-2350 stall speed.
The cam is like the brain,change it and the rest will have to follow.
Waterfall effect can and will happen.(
Cam bearings may be wiped,then motor gets pulled,then another upgrade.Yadda Yadda..
OH,yeah we can do....."(
Title: Cam Selection
Post by: Rich on March 31, 2009, 02:53:23 PM
If you put in a 383 magnum cam you will need to put in new valve springs too. The stock 383 springs are good for the .420" lift of the stock 256 degree cam, but the HP engines used stiffer springs with fewer coils so they wouldn't go into coil bind with the slightly higher lift magnum cams (.454" ).  See the pic for a spring comparison.

All that being said, I'd try a Comp XE256H (good for 1000 to 5200 rpm) -- the 268/284 is probably a bit much for a wagon (1600-5600 rpm--not enough torque down low). They also make a Dual Energy 255DEH that has all the low end torque of an RV cam with a bit more top end (good for 1000 to 5000 rpm)