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Old 04-08-2012, 01:35 PM
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Default 7445 Adapt a cap dimensions

Are there engineered drawings for the 7445 adapt-a-cap kit? I've got a one off distributor drive that I want to change over to the 7445 cap and rotor kit. I know I need the cap, base, rotor, rotor adapter.
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Old 04-09-2012, 07:06 AM
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Measurements I need....

Base diameter
On the distributor it adapts

Shaft size/shape
How much does the shaft Stickout from mounting flange
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Old 04-09-2012, 04:12 PM
bill jones bill jones is offline
momentary specialist
Join Date: Jun 2005
Location: SLC Utah
Posts: 417

-I have an old MSD distributor with a black plastic Rynite base and a #7445 cap adapter set that measures:

1---1.580” cap adapter mount surface to top of rotor mount surface
2---2.757” cap adapter mount surface to top center of rotor’s flat contact spring surface.
3---0.714” mounting surface for cap at top of cap adapter to top or rotor’s flat spring.
4---0.623” caps center rotor button down to mounting surface for cap at top of cap adapter.
5---0.091” preload of the carbon button against the rotor’s flat center spring.

-there is about .015" end play in the distributor that I wasn't paying attention to while getting these measurements.
-the bottom of the adapter base has recess where it slips down onto a distributor---the diameter of that recess is 3.780" and it's about .160" deep.

-this adapter bolts down to a flat surface with either one pair of .630" wide bolt hole slots spaced at 4.330" or there's another pair of .630" wide slots spaced at 4.085".

-rotor looks like it fits the older GM point style and MSD's fairly common old style Gm distributors where there is a square tab and a round tab on the rotor to orientate the rotor to the rotor mounting plate.

Last edited by bill jones; 04-10-2012 at 09:00 PM.
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