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Leaded to Unleaded Engine Conversion

  
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Leaded to Unleaded Engine Conversion

 
randl randl
New User | Posts: 2 | Joined: 05/13
Posted: 05/27/13
09:30 AM

I acquired a 1963 Ford Falcon with a 289 engine that still uses leaded gas.  I'd like to convert it to be able to use unleaded gas.  Besides refreshing the engine, are the heads the only thing I need to replace to achieve this conversion?  

waynep712222 waynep712222
User | Posts: 103 | Joined: 03/13
Posted: 05/28/13
04:50 AM

just using unleaded gas won't effect the engine for many thousands of miles..  perhaps 10 or 20 thousand..  or more..    

there are some lead type substitutes that you add to the fuel ..

when it comes to a valve job ... you can have the valve seats replaced with hardened inserts by a decent machine shop... either valve guides or more than likely thinwall valve guide liners to restore valve guide clearances..

early 289 motors had fairly small combustion chambers.. so just swapping on  a later set of heads that already have induction hardened valve seats may lower your compression and reduce your engines power..

C3OE
63 289 HiPo
Screw in Studs
Valves 1.67, 1.45
49.2cc

C3OE-B
63 260
Valves 1.59, 1.39
54.5cc

C3OE-E
63-64 289
Valves 1.67, 1.45
54.5cc

C3OE-F
63-64 289
Valves 1.67, 1.45
54.5cc

C4AE-C
64 289
Valves 1.67, 1.45
54.5cc


on that engine... its probably already been replaced.. but please... use a breaker bar with a tight fitting socket on the harmonic damper center bolt...  rock the crank back and forth while watching the distributer rotor..  if you get more than about 9/16 of an inch of movement at the outside of the damper before the distributer rotor reacts.... you might really want to think about replacing the timing chain set..



you will also want to pick up some new 5/16 fuel hose.. and an inline fuel injection type of fuel filter and install it in a loop of line between the fuel line coming thru the inner fender and where it hooks up to the fuel pump inlet.. so the fuel pump only sees FILTERED FUEL..  

randl randl
New User | Posts: 2 | Joined: 05/13
Posted: 05/28/13
07:21 PM

Thanks a lot, I like all the advise and will make it part of my "refreshing the engine" work.