Cliff's Quadrajet Parts and Rebuild Kits

Quadrajet Problem Solving => Diagnose a Quadrajet carburetor problem => Topic started by: chance on April 14, 2017, 11:08:43 AM

Title: OOOPS!!!
Post by: chance on April 14, 2017, 11:08:43 AM

Just realized I didn't give the cam specs.... getting old isn't for the meek....lol The 383 has a 284/484 purple shaft cam. 284 duration, 241@ .50 intake and exhaust. 484 lift, 108 lobe separation.

Title: Re: OOOPS!!!
Post by: Cliff Ruggles on April 15, 2017, 01:50:42 AM

Vacuum is pretty low for that cam in your application.

I built the same exact engine many years ago for my 1970 Roadrunner, 906 heads, flat top pistons, and steel shim head gasket with the Mopar 284/484 cam.  It idled pretty good, with around 11-12" vacuum at idle speed.  I drove and raced that engine for several years before replacing it with a 440 engine using the larger 509" lift Purple Shaft cam.....Cliff