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Old 09-24-2007, 09:42 AM   #3
swb85
On a budget like Fred Sanford
 
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Join Date: Oct 2005
Location: Topeka, KS
Posts: 2,031
Re: So the 305 blew last week ...

Quote:
Originally Posted by Yankeelights View Post
Has anyone tried mixing their own high octane gasoline? I just filled the tank with 87 octane and this 406 will NOT like it. I was going to try about 20% xylene.
Never mixed it with 87 octane, but here's the chart the guys around here use for premium fuel:

Formula #2 - Xylene
R+M/2 (octane).........117
Mixtures with 92 Octane Premium
10%...........94.5 Octane
20%...........97.0 Octane
30%...........99.5 Octane

Looks like ~20% xylene should get ya in the ballpark.
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'85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread
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