Ran many motors on the street with 12:5 to one compression. The last one was an iron head 427 that I sold in 1993. Always ran good gas and made sure timing was on the money and a good cam to cut down on cylinder pressure. Any way to do it today without having a hand grenade? Any octane boosters work? This motor has Aluminium heads. Thanks. Leo.

I ran a 10.5-11.0 to 1 388 in my t/a I had to keep 93oct in it any lower and it ping real bad. your running 12.5-1 wow I dont know of any oct booster that would kick oct up more than a point or two all I can say is 100octpump gas and some oct booster might do the trick lucas oil make a good oct booster good luck

unless you have the timing cranked back 93 octane may not be enough; Rocket brand racing fuel is probably your best bet -- some of the local speed shops carry it; also, here in Maryland one of the local race tracks will sell you 108 and 110 octane racing gas

Try Kemco 130 Lead Supreme!

It is real "Tetra-ethyl Lead" so will raise octane by numbers not points!

Like 93.0 to 98, not 93.0 to 93.8!!

As for doing this, Mr. Ray T. Bochaz wrote two articles about a Tech. College Shop class that took a 502 and installed Mr. Fuelings new aluminum BB Torque truck heads and ran it on 87 octane above 12 to 1!!

They were shooting for 700 t at something like 3800 rpm for dualie work truck use and got 660 t or so out of it. Mr. fueling's heads raised the t at midrange like 100 pound foot so they DO WORK!!

BUT they are NOT race heads b/c they have little-bitty valves and figure-8/peanut shaped chambers with a centrally located sparkplug for true flat-top piston use and a CR of probably 10 to 10.5 to 1. The article went on to say that his heads were too small for the 502 and that he had sized them for the 454 WORK Truck engine.

pdq67

You might be able to do it with a real loose converter, a cam that bleeds a lot of pressure down low in the rpms, a super cooling system, and really good luck.
But I would have to ask why. I understand Cam2,VP,Toro, and other race fuels are expensive but so is that engine.

Water/Methanol inject it with premium..:thumbsup:
http://www.snowperformance.net/default.asp