1973 Ford 302 (Slikcraft)

[sfinch]

Is it an absolute necessity to use a lead additive in the fuel? If so, should I use an octane booster. I have been using the lead additive and noticed a lot of build up in the carberator, but question what the build up is.

 

[Dunaruna]

Re: 1973 Ford 302 (Slikcraft)

You mean a lead substitute, don't you? <br /><br />The lead in leaded fuels lubricate (and therfore cool) the upper cylinder - specifically the valve seats. Cast iron heads such as yours will pocket the valve seats if they don't get enough lube - that is the one and only reason for lead. Alloy heads have hardened seats as standard.<br /><br />These days when a head is reconditioned it is common practice to fit hardened valve seat inserts, this negates the need for using lead (and in the automotive world it's inperative for L.P conversions).<br /><br />So, have the heads ever been reconditioned? <br /><br />Aldo