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Hmmm...is this a truck distributor? By 1983 all GM passenger cars were using computer-controlled dists. As Paul mentioned, consider an Accel adjustable vacuum advance unit. I suggest a recurve kit as well if you want to experiment with distributor tuning. I like to shim my HEIs for endplay in the .006"-.010" range, too. The main difference between ported and manifold vacuum is that at or close to idle ported is zero and manifold is high. Once the throttle blades are cracked open the ported and manifold levels are very similar. In a nutshell, do some driving with each setup and stick with the one you (and your 283) like best. Brad O. > I guess I should also mention that it has a 1983 HEI distributor. > > -----Original Message----- > > The question is, should I set up the vacuum advance on the 1969 El Camino to > be ported or non-ported? It is a 1958 283 block w/ a brand new Edelbrock > Performer intake & Edelbrock carb. > > TIA for any advice, > John ----------------------------------------------------- To Unsubscribe please visit www.chevelles.net/list.html To start a new topic, send mail to: [EMAIL PROTECTED]
