Some more info for you.
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The Distributor Series Designation:
Your distributor SERIES number is the first two digits of the numeric part number (automotive applications). On Marine applications this can be a bit tricky. On marine applications you will need to know what style distributor you have (breaker points, M.B.I., or Unilite®). With that information you must look at the drawing and decide what advance style you have, and what type of cap you have (CAUTION: You cannot swap a flat cap for a stack cap or vice-verse, the distributors are inherently different). Mallory has changed advance styles over the years and the current style is a "YH" advance for both automotive and marine applications which will be stamped on a tag on your distributor. Even though your Marine distributor says "YL*****" as the part number, it may or not be a "YL" style advance system. It is your responsibility to look at the assembly drawing and verify the advance style.
Mallory's Distributor Advance Upgrade Service:
Mallory offers a unique service that "for a fee" and if you have a distributor that meets the requirements (meaning it is not a prehistoric version), that you can upgrade your YL, YT, or YS series advance style to the newer YH style advance. This can be done to automotive and marine distributors. You must send your distributor to Century Performance Center for this upgrade. We hand deliver these items to Mallory usually the same day we receive it. Typical turnaround time is 3-5 days. For more information please contact us at:
csm@centuryperformance.com
Mallory Repair Service:
On certain products (besides warranted items), Mallory offers a repair service of these items. Whether it is a distributor you want to have upgraded to electronic trigger, or a fuel pump that needs to be rebuilt, we at Century Performance Center can take care of this service for you. You must send your items to Century Performance Center and depending on the item, the turnaround time is *typically* 5 business days or less. All work is performed by Mallory techs. We hand deliver these items to Mallory on your behalf usually the day we receive it. For more information please contact us at:
csm@centuryperformance.com
http://www.centuryperformance.com/mallory/assm.asp