That impco system you are getting, was designed by my dad in 1973. His was on a 73 k20 2wd with a 454/sm465.
GM gave him the truck. Impco provided parts and fabrication support. Overland motor homes paid his time. They were all afraid the RV market would die when gas hit $1/gallon. Propane was $0.32/gallon.
Ran the truck to 250k miles without an issue. He put gas back on it in combination with the propane. Finally had to do a head gasket. All new factory spec bearings and rings, a cam and lifters went in it. Last I heard, it was at 480k miles.
GM gave him the truck. Impco provided parts and fabrication support. Overland motor homes paid his time. They were all afraid the RV market would die when gas hit $1/gallon. Propane was $0.32/gallon.
Ran the truck to 250k miles without an issue. He put gas back on it in combination with the propane. Finally had to do a head gasket. All new factory spec bearings and rings, a cam and lifters went in it. Last I heard, it was at 480k miles.


Looks nice regardless.
