Msd Street Fire Vacuum Advance Adjustment

I have a crappy dial back timing light and it waivers when i go to higher settings but it seems with the vacuum i am running at around 28 deg advanced timing at idle. I set the initial to 12 deg. The street fire has a cast aluminum housing while the msd model is billet polished aluminum.

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The vacuum canister is not adjustable i spoke with msd.

Msd street fire vacuum advance adjustment. The two are easy to distinguish. Given the slew of variables most high performance or race distributors do not make use of vacuum advance case in point is the msd pro billet distributor shown in the accompanying photos. A vacuum advance system can increase the total timing to 50 degrees or more. 0 14 17 5 8 11 14 17 dc b a d b c a 14 11 8 11 5 thru 8 thru thru thru 0 22 25 13 16 19 22 25 c b a msd pro.

Then i hooked up the vacuum advance. It is designed for use on the street fire hei pn 8362 and the msd pro billet pn 8365. I m not a big fan of this piece but i am trying to work with what i have. Optional advance kit if you would like to adjust the centrifugal advance of your street fire hei distributor a spring kit is available as pn 8428.

I set the timing without the vac advance hooked up. These msd vacuum advance mechanisms are designed to replace the vacuum advance chamber on the msd hei distributor. They are made of steel and feature cadmium plating for maximum durability. After some tweaking and test runs i was relatively happy with the results.

Figure 3 hei vacuum stop plate pn 84281. With the vacuum line and canister plugged. For msd pro billet hei pn 8365 and street fire hei pn 8362 the hei vacuum advance stop allows you to limit the amount of vacuum advance that occurs while driving. The distributor was fitted with an adjustable vacuum advance canister so we connected the can to manifold vacuum which added 14 degrees of advance and created 30 degrees of advance at idle.

My 383 came with a msd street fire hei distributor.