dmdec Posted February 5, 2016 Report Share Posted February 5, 2016 Thought it would be a good idea to get some expert advice on this subject. Will be getting the barn find '51 Cranbrook on the road this spring and would like to know if I need to use a lead substitute to protect the bone stock six banger. I plan on very limited mileage, probably less than 500 miles per year. Any thoughts ? Thanks (car has 39000 miles) Quote Link to comment Share on other sites More sharing options...
Young Ed Posted February 5, 2016 Report Share Posted February 5, 2016 Yup you don't need it. Car has hardened seats already. 1 Quote Link to comment Share on other sites More sharing options...
TodFitch Posted February 5, 2016 Report Share Posted February 5, 2016 All Mopar L-6 engines from at least 1933 for Plymouth came with hardened exhaust valve inserts and special alloy exhaust valves from the factory, so as Young Ed noted no lead additive needed. (Even if the engine did not have those features you wouldn't have a problem with light duty anyway.) If the fuel system has not been gone over in the last 10 or 20 years then there may be some rubber components which are not happy with modern gas additives. If in doubt, replace the rubber flex line between the frame and the fuel pump, rebuild the fuel pump with a kit containing modern materials and if the needle valve in the carburetor has a rubber tip see about replacing it. 1 Quote Link to comment Share on other sites More sharing options...
Frank Elder Posted February 5, 2016 Report Share Posted February 5, 2016 Also it may have a rubber accelerator pump skirt, some kits didn't come with a leather skirt. Quote Link to comment Share on other sites More sharing options...
dmdec Posted February 5, 2016 Author Report Share Posted February 5, 2016 Thanks guys, thats exactly what I needed to know. I love this forum ! 1 Quote Link to comment Share on other sites More sharing options...
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