The following is a direct copy from the Information & Recommendation sheet that we send out with every 604 crate engine that we rebuild. (You can view the entire I & R sheet on our facebook page in the "notes" section.
http://www.facebook.com/profile.php?id=100000435266960)
We recommend the following fuels for the 604 crate engine:
Regular race gas (non oxygenated): Renegade 98 - or any equivalent race gas that does not exceed 105 octane.
Oxygenated race gas (for maximum power): Renegade RatMan Crate 108sr - VP Crate Horse Power (The Renegade Rat Man Crate 108 produces the same power as the VP CHP fuel. Both of these fuels produce more power than any other oxygenated race gas we have tested. However both the Rat Man Crate 108 and the VP CHP require some carb modifications in order to run properly. (We use the Renegade RatMan 108sr in our own house car.) NOTE: On January 1st 2012, RatMan 108sr will be called RatMan Elite)
Renegade racing fuel can be purchased directly from Ford’s Fuel Service, INC. They will ship product anywhere in the US. Contact Tim Tyner at 1-800-615-5981 or (843)-756-3918. You can also find them at
www.mrracefuel.com
In addition, we recommend using ONLY race gas. Regular pump gas is too unpredictable as far as ethanol content. Since the Federal Government has allowed oil companies to cut their fuel with up to 10% ethanol, we have seen serious performance issues with engines running regular pump gas, as well as some engine failures (i.e. burned pistons). Blending pump gas with race gas will also result in unpredictable mixtures, and NEVER recommend attempting this.
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