Re: Hey 4 bbl Carb experts.

Posted by d c On 2014/6/19 20:35:49

I am no expert but I can give some tips on the 4GC as I had issues with the one on the 55 clipper custom. Rebuilding that carb may seem like a simple undertaking. In earlier days an overnite in the carb acid and new seals etc would get you rolling down the road. Now the acid is an enviro issue and without a proper cleaning results may be less than the desired. A safety issue may also arise with floats. These carbs have dual floats mounted in pairs on a wishbone arm. I could not find new floats so i repaired one of the secondary floats with the solder technique. Well it worked great for a few months then the other sec float developed a leak and due to the design, the uneven cocking hung the secondary needle open and caused fuel overflow out the vent and a fire hazard. The secondary floats were very thin due to stagnant fuel in the bowl not being used unless your really in the throttle. I would be afraid of used or even NOS floats and unless you can get brand new asem (2 floats on the armature) even repairs may cause issues as these need to rise perfectly level so as not to get Hung up. I have the orig on the bench and an adaptor plate and a modern holley or demon is very tunable and she runs fantastic. very clean, never loads up and never leaks down, no cyl wash, no oil dilution. She can sit 4 or 5 weeks- 3 pumps and fires up before the motor makes 2 ful revs.Anyone have a lead for 4GC carb float asems new on the arm?