Jake595

Hello Everybody,

I'm new to the Mopar would and excited to be here. I have a 67 Plymouth Belvedere 2 with a stock 383. I'm looking to replace the cam. I'm not looking for any specific power numbers. Just looking for a little more aggressive idle and something that will work with stock internals and stock valve train. I'm also replacing the intake manifold, carburetor and installing headers. If you guys have any recommendations for a cam you like or another forum that might have the info I am looking for that would be awesome. If you need any more info I will answer the best I can! Thank you all.

Archer

Jake -

Best suggestion for overall performance/drive-ability is keeping the lift under 500 and total duration under 300.
(Assuming stock torque converter, if auto and highway gears.)
More than that, besides loosing some low end torque, vacuum can become an issue.
Comp Cams is a pretty good source, and their versions of the old "Purple cams" are pretty good.

I would also upgrade the ignition system to electronic (the Orange or Chrome box Mopar conversion kit is cheap and works well).

Archer

Iowan

Duration at .50 is a more accurate measurement in determining duration. I would stay around 220 @ .50 lift for a stock block….

Kuvasz101

I've owned many 383 Mopars over the past 45 years and have dabbled with cams. The best one I found is the stock cam used in the 440/375 motor and also used in the 383 Road Runner engine. The specs are 268/284 duration with 450/458 lift. I just replaced my 383 cam in my Dart GTS with a similar grind because they were out of stock with the one I mentioned. The cam I used was a Comp Cam 268/268 duration with 454/454 lift on both. Very happy with the results. On another quick note. DO NOT USE BREAK-IN OIL!!! No need to remove the inner valve spring either for initial start. I used Quaker State Full Synthetic 5w30 as a pre-lube and just set the timing and drove away. This oil is ranked #1 for PSI wear pressure. Call me if you like. 413-531-7227 Gary

Skwerly

yep, that 268 is a great cam for a stock or stockish street car!

Kuvasz101

It took me many years of playing with big cams with rough idles with no vacuum brakes before I fell back in love with stock or slightly over stock. Maybe it's an age thing, but I'm digging the way it drives. Fun stuff!!