Lead Substitute

Q: Lead Substitute

On my 1968 Firebird 350, is lead substitute added to gas recommended?

A: I add it to my 350 and use octane 92 gas. I do both to increase the octane levels the engine was originally designed to run on. This recommendation started when I started having acceleration and knocking problems when I finally had to switch to unleaded back in the mid 80s.

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