Hi All,

I need a baseline for jetting a pair of 4150 650cfm squarebore carbs on my Merc 350's. They are running vortec heads, performer airgap manifolds, and stainless headers. Standard 2004 spec merc cams (whatever they are), and merc Thurder ignition.

A basic main jet recommendation would be great (to use as a starting point).

The engines power a Scarab 34 (heavy).

Thanks,

Craig