ACCEL 31034 Adjustable Vacuum Advance for GM Points Distributors
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The lower distributor plate is moved by applying vacuum to the vacuum advance unit, but the mechanical advance weights are not moved. If it's a chevy distributor, you'll be able to see the plate move by opening the distributor cap window.
Unless it's a one-of-a-kind distributor, it should fit the majority of Chevy distributors. To which distributor are you attempting to secure it? Thank you very much. br>br>
I'm afraid I can't say whether or not it will fit a Ford 301. I've got mine mounted on an Olds Cutlass 350 and it's fantastic. It's the second time I've done something like this. The first one lasted for more than a decade before the diaphragm failed. I believe an ACCEL dealer website would be able to provide the correct part number for a Ford 302.
The hose connection hole is just big enough for a small 3/32". It takes a bit of wiggle to get it to engage the adjustment nut. At least a couple of inches in length is required. The allen wrench is included in the package. A 1/4 turn clockwise advances/counterclockwise retards the vacuum advance timing while cruising, according to online instructions. On two Chevys, I had great luck with mine.
Selected User Reviews For ACCEL 31034 Adjustable Vacuum Advance for GM Points Distributors
My previous Crane adjustable vacuum advance failed due to a bad diaphragm, so I bought the Accel 31034 to replace it. To access both mounting screws, I had to remove the distributer before installing it. I like how Accel includes a graph in the instructions that shows the relative performance settings of vacuum advance based on RPM, number of clockwise turns, and vacuum. On the Crane model, I couldn't find this data. In order to get rid of the "ping" on the crane model, I had to detune it a lot. I didn't install the Crane's limiting adjustment because it altered the base timing. This may have helped, but it seemed like a pain to adjust it because the distributer would have to be removed each time. So far, I've only detuned the Accel one turn counterclockwise from how it was shipped. I believe they are shipped with four turns clockwise, though I have not confirmed this. The drivability is superior to that of the Crane model. My mileage, I believe, will also improve slightly. In my 1966 Chevy C10 daily driver with 350 V8, the diaphragm failed after only 7 years and 30,000 miles. You can see if the breakerplate is moving by sucking on the vacuum hose that feeds the advance mechanism while the cap is off. The ported vacuum from a Holley Carb is what I use. br>br>Well, the Accel 31034 failed on November 23rd, 2011. It only lasted 4000 miles and a year. Before it failed, it worked perfectly. Perhaps it had spent too much time on the shelf. The truck had a sluggish feeling to it. The breaker plate was not moved or vacuumed when the hose was disconnected from the carburetor. Because I enjoyed the performance, I ordered another from Oreilly and will give it another shot. br>br>After 30,000 miles, I'm still working on both of my cars in November 2020. br>br>As of November 2021, both Chevys are still being worked on. I like how you can fine-tune the centrifugal advance and then add in the vacuum advance tuning for good street manners and cruising performance. Reduce timing by turning counterclockwise, and increase timing by turning clockwise. Tune hot engine with light throttle uphill on hot day to just eliminate ping; turn a half turn at a time and test drive. To the accel vacuum advance, I connect the ported vacuum advance from my holley carburetor.
I was unable to install it because it had already failed. I really wanted to believe it would work for me, but it didn't. Just like the two other reviews that said the allen wrench screw didn't work for them, the one I got stripped even though I was very careful! Although this is a great idea, I would not recommend this product!.
This item was delivered on time. It performs admirably.
This vacuum advance should be able to be adjusted. It worked for a while, but then the internal adjustment mechanism failed, and the allen wrench was no longer able to adjust the settings. THIS PRODUCT IS NOT ONE THAT I WOULD RECOMMEND.
I had to use a wrench with a rounded end because the provided allen wrench wouldn't fit in the adjustment mechanism at first, and even then it was difficult to get started. The provided wrench would fit after I had fiddled with the mechanism a little. Not a good way to get started, especially if the unit was mounted on a vehicle and difficult to access. Aside from that, the canister appears to be in good working order. The instructions are clear, but they imply that there is a positive stop at the counterclockwise end of the adjustment when there isn't one: Rather than clicking, the adjustment screw begins to turn. That clicking is, in my opinion, normal. I'm looking for a Crane Cams 99601- 1 as a point of comparison The crane one has no issues with adjustment, and based on the two I've seen, I'd recommend it.
I was warned that adjusting this can would require extra caution because they were easily stripped. So, even though I removed all pressure from the diaphram while adjusting, the adjustment was still stripped. To cut a long story short, the opening Hg was close to what I needed, so I just made a few stops to fully adjust my advance, but I would have been out of luck if I needed the can to work properly. I was going to contact ACCEL about it, but I couldn't find a simple way to do so either, so I gave up.
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