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OK, I would look/google "vacuum advance stop plate". I don't know how much this forum likes linking. You can use pretty much anyone's adjustable vacuum advance kit. The crane kit was nice because it had almost everything. You had to do a little machine work but it wasn't bad. The parts you'll need:Adjustable vacuum advancea limiter plate you'll have to makesome screws (you'll need the drill and tap for these)the springs from one of those kits for adjusting mechanical advance (the weights are junk)timing lightThere's a guy that used to post on other forums called ignitionman that has the setup that you need in terms of initial, how fast you want to see the mechanical and then the additional timing for the vacuum advance.Clear as mud?
You are going down a rabbit hole. You could simply retard the timing if it is over-advanced. Figure out why it is pinging:What plugs are you running and how do they look?What is your initial timing and total timing? Do you have a borescope? Can you get a look in the cylinder to see if you have excessive carbon buildup? You can buy a cheap borescope for your phone for like $10 bucks on eBay.
Quote from: TexasRed on November 08, 2021, 12:23:51 PMOK, I would look/google "vacuum advance stop plate". I don't know how much this forum likes linking. You can use pretty much anyone's adjustable vacuum advance kit. The crane kit was nice because it had almost everything. You had to do a little machine work but it wasn't bad. The parts you'll need:Adjustable vacuum advancea limiter plate you'll have to makesome screws (you'll need the drill and tap for these)the springs from one of those kits for adjusting mechanical advance (the weights are junk)timing lightThere's a guy that used to post on other forums called ignitionman that has the setup that you need in terms of initial, how fast you want to see the mechanical and then the additional timing for the vacuum advance.Clear as mud?MSD makes a plate that has multiple options, it's $12 bucks so it seems like that might be were I start. See what I have for full in timing and then start backing it down.K
Should not be much wear on a 90K engine unless it has been abused.
The reviews on amazon for the MSD leaves a little to be desired.Well, I found an extra scroll plate from crane. You have to drill and tap the advance in front of the pin on the vacuum advance. NOT like what Crane describes. Each notch should be about 2 degrees.https://static1.s123-cdn-static-a.com/uploads/278432/2000_593f642430b4c.jpg - not my picture, but it's kind of what it would look like.I would think with the vacuum canister plugged in, you'd get around 20 extra degrees of advance.