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Original Message
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| RE: Fuel? |
| By Hot Rod Lorenzen - 08/17/2000 9:08:30 PM; IP 209.240.220.167 |
| I am a firm believer in the compression ratio rule of thumb: 9.5:1 cr with iron heads, while 10:1 would call for aluminum heads. There are exceptions to this rule because large radiators and rear-end gears can minimize the load on your engine and cooling system. It seems trucks usually have both, so you are lucky. Some quench designs can also go further. Detonation and burnt exhaust valves seems to be the result of low octane or too much C.R. I do not know what 390 you have. Drive it on regular until it pings then either re-curve your distributor or refuel on 92. It seems the vacuum advance yanks on the breaker plate way too hard for today's crappy fuel. More power depends on how much gas money you want to spend! Hot Rod Lorenzen |
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