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Install 4bbl on a 43

rdp

New member
"what kind of gains can i get

"what kind of gains can i get by installing a 4 bbl on my 2 bbl 4.3 omc, what else would i have to change."
 
"intake manifold for sure <[im

"intake manifold for sure
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probably somewhere around another 20 hp?"
 
There are so many factors invo

There are so many factors involved...you could easily wind up with a decrease in power
 
"best bang for the buck power

"best bang for the buck power upgrade is in fact a 4BBL. Your 4.3 is being held back by it's 2 BBL. On my 17.5 footer V6, I gained about 5 mph top end and gained economy at cruise rpm. I recommend the spread bore or quadrajet type 4BBL. Get the smallest cfm marine quadrajet you can find- probably about 500 cfm"
 
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