The Ford Barn

36tbird · 10-31-2014, 08:33 AM

Yo Jim,
Got one of your Chevy units in my 8BA with a Petronix and it has been working great for about 3 years now. My mileage, however is in the 11mpg range and I thought I would try to improve it by putting on a Accel adjustable vac. can. So, I did that and I followed their instructions of backing it counter clockwise (CCW) all the way down initially. Started it up and it ran just as it has so I assumed that was making the can the least sensitive to vacuum as a starting point. Next, I turned the hex adjustment 4 turn CW and took it out yesterday for a drive. It seemed to cruise a bit smoother and be a little more responsive to pedal changes at cruise. Anyway, I was just wondering if the adjustments to these cans on your distributors are standardized enough that you may have seen a good set up and if the springs you send out with your dizzies should be modified with the addition of a can.

Description of the engine: 239, .060 over, 3/4 cam, Offy 3 X 2 with a 48 in center and front and rear 97's blocked off, vacuum is from heater vacuum plate under the 48. The 48 has .043 jets and 69 power valve.

Thanks in advance (get it?)

10-31-2014, 08:33 AM	#1
36tbird Senior Member Join Date: May 2010 Location: nw SanAntonio, TX Posts: 940	Bubba Chevy dizzy with vacuum Yo Jim, Got one of your Chevy units in my 8BA with a Petronix and it has been working great for about 3 years now. My mileage, however is in the 11mpg range and I thought I would try to improve it by putting on a Accel adjustable vac. can. So, I did that and I followed their instructions of backing it counter clockwise (CCW) all the way down initially. Started it up and it ran just as it has so I assumed that was making the can the least sensitive to vacuum as a starting point. Next, I turned the hex adjustment 4 turn CW and took it out yesterday for a drive. It seemed to cruise a bit smoother and be a little more responsive to pedal changes at cruise. Anyway, I was just wondering if the adjustments to these cans on your distributors are standardized enough that you may have seen a good set up and if the springs you send out with your dizzies should be modified with the addition of a can. Description of the engine: 239, .060 over, 3/4 cam, Offy 3 X 2 with a 48 in center and front and rear 97's blocked off, vacuum is from heater vacuum plate under the 48. The 48 has .043 jets and 69 power valve. Thanks in advance (get it?)