Cleveland 351 heads, Changing to Unleaded? - Page 2 - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
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post #11 of 12 (permalink) Old 10-28-12, 06:05 AM
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Re: Cleveland 351 heads, Changing to Unleaded?

You'd also need a hardend or stainless ex valve. Probably drive as is untill it needs doing.

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post #12 of 12 (permalink) Old 10-29-12, 08:51 AM
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Re: Cleveland 351 heads, Changing to Unleaded?

at first when they removed TEL from the fuel blend, whatever they used as a substitute / if anything? didn't work too good and exhaust valve seats started sinking

not sure what they're using today but it doesn't seem to be as much a problem as it was when unleaded first came out

as far as stainless valves... if you have stock Ford valves in those heads get them out of there as fast as you can and replace them with quality 1 piece SS valves
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