Someone asked about leaded fuel vs unleaded some time back. My 68 Chevelle 396 was a hard starter in some situations and I tried adjusting timing, different fuels, additives, etc. But I found only one additive that contains real Tetraethyl lead, same stuff used in premium gas of old days. Mixing 1/2 quart with 20 gallons of Amoco 93 octane figures out to about 100 octane and protects my valves/guides. Nice thing about this stuff is I can have a quart or two with me and if there are no Amoco stations around, I can stiffen it up with unknown fuels.
I used to buy it from Paddock but it jumped up in cost, plus they charge terrible for shipping. Another place has it for like $45/gallon in quarts with very reasonable shipping: http://maxlead2000.com/ This link has good info plus the address to order from. Hope this helps. Steve E. 1968 Chevelle SS396
