Distributor Cap Advance Lever Slot

[Jim/GA]

Originally Posted by Jim Mason

Hard to read. No tolerance noted as it's not a critical measurement

Thank you, Jim Mason. And thank you, Terry. I knew you'd know.

[Bob Johnson]

Easier to read

[sdp.fordbarn]

Be sure to check the width of the advance arm on the upper distributor plate. I bought a new upper plate and found the advance arm was much wider than my original which reduces the available advance travel.

[Jim/GA]

Originally Posted by sdp.fordbarn

Be sure to check the width of the advance arm on the upper distributor plate. I bought a new upper plate and found the advance arm was much wider than my original which reduces the available advance travel.

Yes, that's a good point, and it will send me in search of an entirely different original Ford blueprint or two, for the breaker plate.

[Bob Johnson]

Here you go Jim

[Rob Doe]

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I seem to remember reading that the Model A engine with a stock 4.2 head can only utilize 28-32 degrees of crankshaft advance. High compression heads use even less. 20 degrees of distributor advance will be ~40 degrees of crankshaft advance. If the spark advance lever on the upper plate is just touching the distributor body at full retard, then no more than 7 to 8 notches are required, and wouldn't that be at high speeds of 50 plus or there about????

I've wondered about this. If you're using a 2 tooth Gemmer, a small window can possibly work fine if you're never driving at max speeds.

[the cooch]

Get the column clamp at the box really tight! There is a possibility of the crank handle kicking back while hand starting if the column rotates on the housing and goes unnoticed! The spark lever, even all the way up will still have the timing advanced if the timing is set correctly and the column rotates a little c.c.w. Ask me how I know….Chris, in Boulder

[Jim/GA]

Originally Posted by Bob Johnson

Here you go Jim

Thanks!!!

[700rpm]

I have four, two in cars and two in extra stock. All four have 1” slots. One has Ford script on it, likely a repro. I’ve had these for years and don’t remember where I found ‘em. The two on the cars seem to function as they should.

[Jim/GA]

Originally Posted by Bob Johnson

Here you go Jim

It's good to see the part number, but there are no dimensions on this drawing...