Red73BB
Well-known member
I resently bought a '73 with a 454 was rebuild 3 yeas ago for 425HP (or so the previous owner said). I've been using 93 octane and he suggested adding a lead additive to raise the octane level to 103 for better performance. It runs petty well w/o the lead additve but very well with. Would this damage the engine over long term?
Gary
Gary