Re: Proper gas for 374 engine

Posted by Owen_Dyneto On 2011/2/24 9:25:44
Simply adding tetraethyl lead (or other octane booster) will not in and of itself improve performance. But it increases octane rating so it may allow you to advance the ignition timing a bit before serious preignition occurs, and that generally will result in an improvement in performance.

But the other property of tetraethyl lead that may be more important to those who haven't rebuilt their engines with hardened exhaust valve seats is that it minimizes valve seat recession. So if you don't have hardened seats and drive aggressively, you might consider it (or other gasoline additives that make the same claim) for that reason alone.

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