Originally posted by dennis kelley
Is your vac advance connected to timed vacuum port or constant manifold port? The reason I ask is because I have a mild cam in my 302 and it pulls crazy vacuum at Idle (15inch) and my initial timing is extemely low 4 degrees. I was thinking that if I switch to timed vacuum I can increase initial and have better response. Any opinions appreciated. If it wasn't so cold out I get the car out but no heater or top no test drive until warmer weather
Dennis if im reading this right you are looking to increase your response time. you have 4 degrees base timing and when you crank the motor you are idling with about 15 degrees total timing (i don't know what that is, im just using 15 degrees) so you have about 15 degrees timing when you accelerate, then the timing falls off. so you go to ported vac. and increase your timing to 10 degree base timing and when you start the motor, then you still have 10 degrees of timing, as far as im concern you just lost 5 degrees of timing which will hurt your response time. if response is what you're looking for.