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S-54 single in and out  54 Spool for med engines on methanol 
Use this barrel valve in situations where you want to send the fuel to a distribution block -    
see our #61 OR 58   Spool for large unblown  and Blown  Engines over 20 lbs of boost.
All -6 fittings unless you want to change to -8    secondary always stays as a -6  
57 Spool for GAS  and small 1 -2  cyl engines 
	Has one outlet only.    For Blown Alcohol engines  under 450 cu in or 20 lbs boost
For custom injections.  FOR SMALL 1 & 2 CYLINDER ENGINES ON GAS  USE THE  AD-S-57  MODEL
SMALL ENGINES ON METHANOL USE THE  AD-S-77   OR  AD-S-54 
Please note: if you have a  blown injection or are running Nitro, let us know so that we can use the appropriate spool.