Spark plug suggestion

[threewood]

6° = .340
7° = .355
8° = .375
9° = .390
10° = .405
11.5° = .420
12° = .435
13° = .445
14° = .460
15° = .475
16° = .490
17° = .505
18° = .520

 

[Sonny]

You need to find out what number is stamped on your advance plate first , that determines mechanical advance X2

Another option instead of welding , filing , welding , filing

https://www.manciniracing.com/fbomodilipl.html

Or just find a stamped #9 advance plate out of another distributor

Now we’re talking! I can’t weld so this is perfect for me. Thanks!!!

 

[HALIFAXHOPS]

I’ll dial it back 2 more tomorrow. I’m waiting to get it right before hooking up the vac advance. At 16 my total is about 38 (22 mech). I’ve got some old MSD springs floating around. I may replace the stock thick spring with the “loop” with a blue or silver spring to get total near 34-36.

Just FYI The springs will not limit the total just how fast/slow that it gets there. If you need a plate I should have one.

 

[Sonny]

Looks like 14 initial 34 total is the ticket (timing marks are hard to read but looks like there is 20 degrees or so of mechanical advance built into the Summit Racing distributor). No more knocking, seems to idle better, and has plenty of power too.Thanks for all the suggestions. Didn’t have to modify the distributor.