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View Full Version : 4150 crate carb switching to limited engine?



jrkracing54
07-11-2011, 07:24 AM
I have a Quickfuel 604 crate carb for my 604 engine. I just bought a steel head limited engine that is the same displacement and is estimated at around 550 horse power and will be turned around 7400 rpm compared to 6700 rpm on my crate engine. What changes might I have to make to this carb for this higher horse power engine? I'm thinking bigger jets but not sure about power valves etc. Any help would be greatly appreciated.

rubbinsracin
07-12-2011, 04:38 PM
we did the same thing. but went from a 602 to a limited engine. we ended up with basically the same carb but out back jets went up like 1 or 2 sizes if i remember right. also had to adjust the float levels too. basically you just need to put it on the motor and tune it is nice. run it and check the plugs. we also played with different cams a little bit to dial it in.

jrkracing54
07-13-2011, 11:36 AM
Thanks for the info. John 1*