Need some help here...

[Red63440]

I have a late 60's 383 that I would like to warm up a little and need some info on cam choices. I will be using a Performer intake with a 650 to 750 cfm carb. I will also be using HP exhaust manifolds and at least 2 1/2" exhaust pipes moving the spent gas from a set of 915 ported, polished and gasket matched heads . My converter is 2500 rpm and rear end gears should be limited to 3:55.1 with a max of 3:91.1

 

[Coronet 500]

Have a look at this, easy to use. http://www.camquest.com/

 

[skudkino]

I really don't know much about cams... but, I got one from Comp Cams for my 383 Part #21-221-4

Gross Valve Lift Intake .447 Exhaust .455
Duration @ .006 Tappet lift 256 268

I havn't been too impressed with performance, but the car idles nice and gets surprisingly good gas milage. I got about 18 mpg on a highway trip where I was doing 90 mph for most of the time.

I also have the 2 1/2 inch exaust. My engine is a 1970 383 with 66 hp heads on it. I had it built by a local machine shop. I am still running a 2 bbl carb on it though. (at least until I have the money for a 4bbl)

 

[Crunchy_Frog]

Call Hughes Engines or Diamondback Engines and get yourself a custom grind. Most OTS cams have a chebby grind.

 

[66 coronet deluxe]

I recommend the mopar purple shaft Hemi Grind cam. Bn running it 5 years & am very happy with it, specs are .474 lift and 284 ad duration. I have the same heads 915 w/oversized valves on a stock 78 440 w/headers and 2 1/2" & 750 vac holley. This cam has a great lump to it but will idle all day. It's a perfect street cam, and has massive low end and mid range power. It's a monster off the line. I just ran the camquest chart and came up with the same spec cam as one of the choices.

 

[Coronet 500]

Glad you said it 66, I totally agree. Alot of the new grinds like more exhaust duration and or lift. This Chrysler design has stood the test of time and I used the same one in my small block. Right now we are putting together a turbocharged 318, I ran this cam through a computer program for turbo cams and was shocked it came in close to some high dollar split profile large LSA cams. It will be our choice.

 

[Red63440]

Mancini is showing two different 284/484 cams, which one are you using??