Took a quick picture of the model # on my carb. Trying to find out what it is. Pretty sure its an 850 but I am trying to hunt down a diagram of it to adjust tuning and all that fun stuff.



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Here's a pic might have to zo in



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I can get a picture of it when I get home this afternoon. I was running out the door and just grabbed a picture of the numbers to start.

Thanks for the info to start though. I did some searches and just couldnt land on any good information.

These are the additional pictures. I'm running a stock 502 Chevy. I unfortunately don't have a build sheet or any better information on the motor.

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When Holley introduced these carbs they marketed them to the street rodders because this was their first attempt at a shiny finish.  The basic design of the carb is a copy of an old Ford (Motorcraft/Autolite) design.  The "best" feature and reason they made them into marine carburetors is that there isn't a gasket surface below fuel level... meaning that it should never be able to leak fuel onto your engine (questionable selling point in my book).

It's one of those things, if you have it and it's in usable shape... run it, but if there is any question of condition or run-ability pitch it and get a traditional Holley design.

A quick search of the List # came up with a aftermarket overhaul kit available to replace the discontinued kit from Holley (sounds to me like Holley even wants you to forget that the produced them).

How was the boat running otherwise? 

Do you know if the carb has been overhauled in the last few years?  It might be time.

Inspect the needle and seat for debris that could be causing a rich condition.  How old are the fuel hoses, could they be starting to deteriorate from the inside?

The extended crank time could be due to excess fuel running into the manifold when stopped.