1993 Correct Carburetor

I need a little help for my buddy on his new purchase of a 1993 Ski Nautique. He has a 351 engine in the boat but with a 750 double pumper Holly carburetor. I don’t believe this is the correct carburetor for the engine.  

Is that correct or not?

If not, what would be the correct Holly carburetor?   

Paul

Thanks for the help!

We were out on the water yesterday morning for my first time on his boat. Notice acceleration issues and flooding when trying to start at times. We talk about rebuilding the carburetor to take care of the problems. When we were loading up the boat, he opened up the engine cover and I notice it was a double pumper Holly. Wasn’t sure at the time if it was the correct carburetor or not.  When he looked up the number for a rebuilt kit on the Holley, it’s a 750.  I knew then it was to big for this small block. 

Absolutely no way on earth should anyone spend 892 dollars on a vacuum secondary Holley 600.

Grab a QF m-600. It may or may not require some slight idle circuit tuning. If you can’t get it set up without minor tweaks send it back to Summit for warranty easy peasy. I’ve had to do that once or twice but I’ve seen plenty of new Holleys out of the box suck too.

You’ll have to set up the float level which is easy enough. Recommend starting out low and bring it up slowly.

Since someone has messed with the carb already you’d likely need to order a new PCM fuel supply hard line for the Holley anyhow so grab up a Sierra 18-8115 fuel line.   

Usually you can get a QF with the functioning choke to run basically like it’s fuel injected. Some I’ve set up will even cold start most of the time with no pumps and idle immediately.

Just a follow up on putting the Holley 650 on a PCM351.  My bubby finally got the carburetor on a couple of weeks ago. A lot of texting and face timing in helping him out. There was an issue with the accelerator pump diaphragm leaking and getting a new fuel line from the fuel pump on the engine to the carb. Both were easy fixes.

This past Wednesday we both had the day off and hit the lake to do the final adjustments in checking the timing and adjusting the idle screws. Engine ran extremely well. Way better than it was prior to the change out.