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Old     (typhoon)      Join Date: Jul 2001       08-31-2009, 10:20 AM Reply   
What is the part number or equivalent to the stock plugs that you can get at the automotive store?

Thank you
Old     (hudd007)      Join Date: May 2006       08-31-2009, 10:50 PM Reply   
This is what I found online for you....

Spark Plugs: AC-MR43T

Hope that works for you. I'm not sure though.
Old     (yubasanger)      Join Date: Jul 2007       09-01-2009, 1:19 AM Reply   
AC Delco part # AC 41-993 is the plugs used in the 5.7 and 6.2 Black Scorpion motors. In my years of working on motors stick with o.e. spark plugs for best results. I.e. GM use AC Delco, Ford use Autolite, Mopar use Champion, Honda, Toyota, Nissan use NGK or Denso, German cars use Bosch.

Search around there is a large price difference on the 41-933 plugs, some of the local auto parts stores are $13.00 per plug can find online as cheap as $5-6 per plug. Mercury uses a platinum plug so little more money than your standard copper plug.
Old     (typhoon)      Join Date: Jul 2001       09-01-2009, 5:35 AM Reply   
thank you very much
Old     (chaser)      Join Date: Sep 2006       09-01-2009, 9:53 AM Reply   
My boat uses the same. Originals in mine were 41-932 platinum plugs that have now been replaced by the 41-933 which I think are iridium plugs?
Old     (lilsumo)      Join Date: Sep 2008       09-01-2009, 1:24 PM Reply
Old     (hatepain)      Join Date: Aug 2006       09-01-2009, 3:38 PM Reply   
Brandon, when should the plugs be replaced? 300 hours?
Old     (typhoon)      Join Date: Jul 2001       09-01-2009, 3:40 PM Reply   
I was told 200 hours but would love to hear the answer from others.
Old     (rio_sanger)      Join Date: Apr 2007       09-01-2009, 5:20 PM Reply   
I pulled the spark plugs on my Black Scorpion at 500 hours, and they looked brand new!
I changed them anyway, because I had already bought the new ones, so figured why not, can't hurt.

But if you think about it, 500 hours at 30 mph is only 15,000 miles, and most EFI cars/trucks these days are running 100,000+ miles on plugs.
Old     (hatepain)      Join Date: Aug 2006       09-01-2009, 5:28 PM Reply   
I think more about the RPM's than the MPH since thats what really counts. It's pushed harder and more constant. You're right though most plugs, if not all, are designed to go 100k these days.
Old     (mobv)      Join Date: Jun 2002       09-01-2009, 8:00 PM Reply   
This is from the Skidim website.

5.0 MPI and 5.7 Excal, Indmar 2002+ 5.7L engines.
Superceeds AC41-932 Also replaces MR43LTS for GM Vortec engines if you want Platinum. Plug gap .060
(Price includes 8 plugs).
These last 300-500 hours, clean and inspect anually.
Not recommended for carbureted engines

NGK Spark Plug GM VORTEC 350 Carb or EFI
* NGKTR5 Direct Cross To MR43LTS
* V-Groove Center Electrode = V-Power
* Sold Individually - Order Quantity 8
* NOT For LS1/LQ9, 8.1, Excalibur or Pro S 5.0
Old     (typhoon)      Join Date: Jul 2001       09-02-2009, 7:39 AM Reply   
I finally gor a hold of mercruiser and they said...
MR43LTS with gap at .045
or platinum ac41-932 or ac41-993 with gap at .060


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