http://cars.rasoenterprises.com/Propane-Holley.htm

At one time, Holley Carburetors (Colt Industries) were involved in LPG
carburetion and modified their gasoline carburetors to supply gaseous
fuel.  Very little is commonly known about Holley's propane carburetors
and, to best of my knowledge, the only reference to them was made in
Larry Carley's book.

Gerry Flood, currently of Firexonline was kind enough to provide us
with photos of Holley propane carburetors from time he was in the
propane conversion business in the early 1980's.  His company, Rodagas
Energy Systems, also had shops in Toronto and Detroit and converted
350+ vehicles to CNG and 100+ to LPG.  They become involved with Holley
because Holley was also in the Detroit area at that time.  They never
made any money on LPG as every conversion was a 'test' or 'trial'. The
profit was in selling the fuel. They also converted 10-15 various
vehicles to low pressure CNG and even converted a golf cart to CNG for
the CEO of the local gas company.  He believes that fuel cells and
hydrogen are the future, but if one could clean out the impurities from
natural gas and store it in carbon, then Natural Gas would be hard to
beat.

One of his projects included the conversion of the entire Windsor, ON
police department with Holley in the early 80's when they had Plymouth
318cid cruisers. He reports that the conversions worked fine except in
the winter when they would chase speeders before their engines warmed
up. Then they got a liquid lockup on the vaporizer. He advised them to
carry a coke bottle full of water to pour on the vaporizer. Of course,
by then, the speeder got away!

Mr Flood got out of the conversion business because he felt that
propane was/is a fuel which could not become a major alternative as
there is just not enough. They saw natural gas as the real alternative
and worked with a consortium of 8 gas companies, including the gas
companies in Toronto and Windsor, to develop low pressure CNG. By using
a carbon adsorbent in a LPG tank and a refrigerator compressor, their
idea was to fill up at home overnight without the high cost and
complexity of 3,700psi compressed natural gas. It almost worked. They
even used ceramics from the Royal Military College in Kingston. Natural
gas is inherently dirty, which doesn't matter when it's burning in your
furnace. It matters a lot when filling and emptying a clean carbon
filter. It quickly clogs up!

His present mission to change the world is to market a vehicle fire
suppression system principally for the Ford Crown Vic, which Ford has
developed but can't/won't deliver. His company, Firexonline, is working
with Nobel and they are about to introduce a fire suppression system
based on their gas generator technology. The system delivers AFFF foam
under the car when (or if) the gas tank ruptures and ignites.

He says that he was one of the early pioneers in alternative fuels and
the biggest mistake he made was investing his own money!  With gasoline
prices skyrocketing today, he might want to reconsider getting back
into the alternative fuel conversion business.

Holley 1-BBL Propane Carburetor

Holley 2-BBL Propane Carburetor

Holley 4-BBL Propane Carburetor


Holley Propane Regulator/Converter