natural gas ignition system 1966 GTO

ive not done this myself, but i know those who have.

its reasonably common in europe, since they have huge fuel taxes. most common on older cars (non-computer tbi or carb) since thier easier to convert, as well as taxis since they drive so much. typical taxi in warsaw is a base model e-class, bought 5-7 years used and converted to natural gas.

by all accounts, its cake for tbi or carb conversions. you lost 20% or so power, but if you can pay $3 for the propane equivalent of a $6 gallon of gas it makes sense.

ignition is usually unchanged. you just need a natural gas/propane "carburator".

the only issue i can think of finding a "carb" big enough to feed your motor. 'home brew' setups often use ones intended for forklifts and such, so they work best on little motors. not a critcal issue, just might be tougher to find one cheap, since ebay forklift parts might not work.

It's the same equipment as Propane or LPG except for the High pressure regulator. You can run a higher compression ratio, 10.5/1 or 11/1 as it has a higher octane rating. They generally have more power than gas mostly because of fuel distribution and burn 20 % more fuel purely because of less BTU's and higher octane rating. Imco sells the stuff you need, actually have a mixer (carb) sitting here for a Rochester 4BBL conversion and the mixer is good for 450 HP, they make a y manifold to add another one to a standard 4bbl flange if you need to make 900 HP. CNG is gaseous but they are building LPG liquid injection now. I'ts nice stuff to work with! Total ignition timing is important as is how much fuel you put in. Poor setup can melt/shatter a piston or melt a valve under sustained heavy load. conversion cost is high and with the diference of fuel cost HERE it would take Hundreds of Thousands of Miles to pay off the conversion costs unless you can do it yourself and then have it certified.
It's tough stuff to light so HEI with a good coil, Multispark if you like and gap the 1 heat range colder sparkplugs down to .035", Any current electronic system in very good working condition should do. Good Plug Wires Too!