Your '51 was designed to run on 83 octane so running modern 87 is already providing an octane boost. I'm with Jerry on this one. Lead additive in a stock 235 that's operated within normal limits (not worked hard for extended periods & with stock valve springs) is unnecessary. If it makes you feel better, use it. Is it necessary? No. I've put many tens of thousands of miles on pre-unleaded engines using unleaded gas and have never had an issue.
Last edited by Tiny; 09/16/2016 10:51 PM.
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
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