Reply With QuoteStart with what the carb comes jetted with from the factory.
I have a marine Holley 650 SP, 4160 spreadbore for my vortec 350. Its stock with a stock cam and heads.
Anyone know what a good jetting would be to start with?
Start with what the carb comes jetted with from the factory.
elevation makes a difference. the condor is from corpus christi and the plugs are black after 100 hours. 'bout 1000' elevation difference.
lots of info here > http://www.mortec.com/carbs.htm
Take the list # from the air horn and go down the mortec link, and check the carb for the orriginal jets, start from there. It is rare that a holley does not run well just outta the box as set by the factory so they get em pretty close. Set the idle mixture screws about 2 turns open from seated.
Sweet, thanks!
I thought the spread bore carbs were 4165 (DP)/4175 (SP) series.......MP
4160's are a vac seccondary, square-bore, basically vac sec of the 4150 DP.
4165's & 4175's are a vac secc spread bore Q-jet replacement.
Both usually elec choke equipped.
Man has holley got a lot of carb models.
4165 is a double pumper spreadbore, the 4175 is the vac secondary version....Both spread bores and also there are list numbers for T Quad replacements for the Mopars........MP
Thx for the help MP.
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