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Modifications that are required will depend upon the efficiency of the particular engine in question. The average cast-iron head off a FORD, HOLDEN or CHRYSLER usually requires the fitting of hardened valve seats. The seats on most of these heads are machined directly into the cast-iron head and are not suitable for lead free fuel or LPG. As both these fuels have no lead or additives to soften the force of the valves seating, the valves soon become pounded into the head. This can happen in a very short period and tappets will continually ride quickly burning the valves.
Hardened or heavy duty exhaust valves are also required in some applications. Often if the standard valves are simply replaced with new ones at the time of the conversion a satisfactory valve life can be achieved. So new exhaust valves rather than reground are the minimum requirements.
Another modification that is helpful, is the fitting of bronze valve guides. These guides tend to be more wear resistant and while maintaining good stem clearance dissipate the valve heat better. For LPG Raise the compression if power output has to be maintained. LPG operates well with a high compression ratio. For unleaded lowering the compression can be helpful as the octane rating of regular ULP is lower than super or leaded fuel. Most ULP conversions run better on premium unleaded.
Hardened or heavy duty exhaust valves are also required in some applications. Often if the standard valves are simply replaced with new ones at the time of the conversion a satisfactory valve life can be achieved. So new exhaust valves rather than reground are the minimum requirements.
Another modification that is helpful, is the fitting of bronze valve guides. These guides tend to be more wear resistant and while maintaining good stem clearance dissipate the valve heat better. For LPG Raise the compression if power output has to be maintained. LPG operates well with a high compression ratio. For unleaded lowering the compression can be helpful as the octane rating of regular ULP is lower than super or leaded fuel. Most ULP conversions run better on premium unleaded.
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