Thread: 1961 GMC 4000 with 305B
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Old June 8th, 2014, 04:35 PM
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Default Re: 1961 GMC 4000 with 305B
Those early propane kits were set up for dual fuel. The on highway truck engines recieved no modifications for dedicated propand use (higher compression/different spark timing curve/hardened valve seats).

The engine was set to run and gasoline and the propane kit allowed for switching fuels (the toggle switch turned off the gasoline to the carb and sent propane to the mixer and visa versa) along with the mixer (mounted on top of the carb), tank and hoses.

Removal of all the propane kit hardware will restore the truck to normal gasoline operation.
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