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convincor

05-12-2003 02:23 PM

Thunder Bolt IV drive gear

The distributor drive gear on a 1990 Merc.
Is the shaft .490 or .500 :confused: :confused: :confused:

convincor

05-12-2003 03:27 PM

I've got the melinized gear for new 502.
Does'nt seen to be as tight on the shaft as the gear that came off.
Thunderbolt IV distributor.
Haven't put the pin through yet, want to make sure first.

88 MACH 1

05-12-2003 04:10 PM

I've been told it's .490. The MSD has a .500 shaft. Just went thru it myself. If it's a new cam put in a new gear.

convincor

05-12-2003 04:15 PM

88 Mach 1,
Are you running the MSD or T-bolt?

88 MACH 1

05-12-2003 06:01 PM

MSD all the way....get an extra boost of power at 3000 rpm, kinda weird but I guess that's what it's suppose to do with the box

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