ported or manifold vacuum for timing
05-01-2004, 12:33 AM
#1
Instructor
Thread Starter
Member Since: Mar 2003
Posts: 232
Likes: 0
Received 0 Likes
on
0 Posts
ported or manifold vacuum for timing
As some of you know I have been having some trouble getting my timing right. I am wondering what I should be using for my vacuum advance, ported or manifold vacuum. I have a speed demon 650 and I am using a mallory GM HEI replacement distributor (coil is in distributor cap). Compression ratio is 9.4:1. I am running the stock heads that originally came on the 1980 L-48 engine(76cc chambers 1.94 valves). Also I am running flat top pistons. I am wondering which type of vacuum advance is better for a performance aplication.
