Built 2 HP 500 moters can't deside weather to use msd or my delco stuff. Any input out their. Would like to have rev limiters when I'm airborne

If you still have the merc TB distributors you may want to just keep them. The MSD will rust out, I have seen many pictures. I have computer controlled timing and I use the Marine DUI distributor. The automotive distributors are not approved for marine use.

I agree, I run H/P HEI works great.....to many issues with the MSD's

What preventions can be made to keep it from rusting?

I have the billet msd distributer now. I dont see anything wrong yet, but only 2 seasons

Have you taken them apart? They rust on the inside

Yea!! Nothin yet! Keepin my fingers crossed!!

buy a lottery ticket...

I have run the Marine grade MSD stuff for years and it all rusts and corrodes. Just replaced the distributor and the box. Their coils seem to hold up, but nothing else. But I still would not run anything else on the blower motors. I use to run magnetos, but they were a pain in rump, also.

what about these? no coil?
how do u set a rev limiter?

nobody?