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Holley 750 double pumper jetting

B

Basin_Runner355

Well-known member
I bought a used Holley 750 double pumper it’s been sitting on a a shelf for a while so I’m going to put a rebuild kit in it so I know it’s fresh was wondering if somebody could tell me what jets should be in it it’s going on a bone stock zz4 with a 2:1 belt reduction he said don’t remember what motor it came off off cause he has like 20 Work boats so while it’s apart I wanna check make sure I have the right jets in it so I don’t have to tear it down again
 
http://www.innovatemotorsports.com/products/mtxl_plus.php

To do it right spend a few bucks and buy one of these and take the guess work out . In the long run it will save you time and money plus a peace of mind
 
Basin_Runner355 said:
How it works you have to put a fitting on your headers or in the flex pipe
Click to expand...

I run the double one on each side it works great you can be sure everything it running correctly I welded the bungs just before the mufflers on the muffler inlet flange. I like it but know many people who do not use them and do just fine.
 
Well my mechanic don’t really work on small boats and he has some made for 3.5 and 4 inch pipe that he hooks on the ends and tunes it off his computer but he don’t have any made for 3 inch yet
 
you have to weld the bungs on the end of the headers before the flex pipe. the flex pipe leaks oxygen and will give you false readings. Read the install manual in the Innovate web site I sent you
 
Save your money on that gauge send the carburetor to a specialist S&S carburetor is in my opinion is one of the best send it to
 
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