Msd distributes bushings?

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07-13-2018 | 05:02 PM

Scscoripion

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From: Toledo

Msd distributor advance stop bushings

Can anyone tell me the sizes of the advance stop bushings on an msd distributor ? I can’t tell what color it is because it’s a little rusty. Also , what spark plugs would you use on a 454 with B&m 250’s? Got this old project boat almost ready,,,,

Last edited by Scscoripion; 07-14-2018 at 08:02 AM. Reason: Bad spelling

07-13-2018 | 05:07 PM

Scscoripion

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My bushings are .430

07-14-2018 | 01:06 AM

Griff

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Assuming BBC rect port heads, I would run AC MR41T plugs.

07-14-2018 | 07:59 AM

Scscoripion

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Thanks for the reply, I will try them. Any idea on the distributor bushings? I took my msd apart yesterday,trying to figure out the timing curve.

07-14-2018 | 08:06 AM

Scscoripion

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Also, yes they are bbc rectangle heads, were mercury 400,s , now mabey 550 h.p.?

07-14-2018 | 01:23 PM

Griff

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The kit should have all the specs https://www.summitracing.com/parts/msd-8464

07-14-2018 | 10:20 PM

Scscoripion

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Thank you Griff, I’m going to look at it, I checked my plugs, they are NGK # 7

07-14-2018 | 11:59 PM

Griff

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Quote:

Originally Posted by Scscoripion

Thank you Griff, I’m going to look at it, I checked my plugs, they are NGK # 7

Those are probably close. The NGK 7 is equivalent to and AC 42 heat range.and an NGK 8 is equivalent to an AC 41.
Stock NA Merc engines run an AC MR43T or NGK BR6FS. Merc 525SC/600SC run an AC MR41T

07-15-2018 | 08:53 AM

TomFTM

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From: Glen Cove ,NY 11542

I will let u know tomorrow about the bushing sizes, working on msd distubuter tomorrow and I have all the bushings.

07-15-2018 | 08:45 PM

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Scscoripion

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From: Toledo

That’s good ! Do you have any idea what curve I should run with 8.6 compression,B& m 250’s , 1000 cfm Holly’s, stainless marine headers, 24 pitch 4 blade Cleavers?

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