Gonna get an extra screw and drill another hole. Will i need too grind flats in the shaft where the screw hold it?

I wouldn't grind on the shaft

Hmmm,

I recently pulled my MSD billet distributor apart to do some maintenance on it after 10,000 or so miles and did indeed notice some play in the shaft. Took the dial indicator to it after I cleaned, changed advance bushing to a custom 16 degree bushing and installed new springs. The play was around .015. Assembled everything back together and up revved the engine and the timing advanced steadily to 36 degrees with no bouncing or retarding. Do you know how much play you have?

Cab, thanks. Didnt really want to grind on it anyhow. No, but not much. Took it out of the box locked timing and installed. I picked up 3 collars. 3/8 7/16 and 1/2. I dont believe the msd has a 1/2" shaft, but i should have it covered with 1 of the 3. Robbed a tap from my dad so im golden. Thanks guys

Worked on installing the dist collar today. First tried installing it with no extra clearance, just tight. still had 2* retard with rpm, so took dist back out and set with about .010" clearance between the collar and gear and I tightened up the reluctor wheel gap to .010" as well. Put back together and same 3* retard with initial rpm. I'm thinking my cam is moving. I did not use a button on that when I installed it. so add a button or a crank trigger. crank trigger is easier.

How much slop in the intermediate gear and the tang on the end of the shaft..........I had mine brazed thicker than stock then hand ground it till it fit tight in the gear..........

I hope you are not seeing the Multiple spark function of the MSD.

I use ice ignition. .006 in the dist shaft and about .010 between collar and gear. With no clearance at all i had 2* retard. Something else is going on here.

Again, i had a firecore distributor before this msd and the firecore was rock steady with the timing. What could be different between the two that one has steady timing and the other pulls timing at rpm?

So it's an ICE ignition and MSD distributor? Doesn't ICE make a distributor?

For most of my life I used a magneto because I hate electronic stuff.

I'm not a fan of mix and match stuff.

Yes. Mag pick up on both. Ice dist are not mag pick up and cost about $400.

If the firecore distributor was rock steady why did you change it to an MSD?