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Some interesring points....
Some interesting points in the rule book for stock category are:
Cam Timing: Any cam timing may be used
Cooling: Any oil-, water-, or air-cooling change, which allows the engine to run cooler, is permitted, unless otherwise prohibited. The 914 plastic engine cover water tray may be removed. Such changes tend to extend engine life and should be encouraged
Fuel Pump: Any fuel pump may be used. Fuel pumps should not be a problem. If, in a specific case, the fuel pump is a limiting factor, the driver should be allowed to correct the problem
Balancing: The motor may be balanced. Note that this is not necessarily a recommended procedure. Most Porsche engines are built so precisely that they will not achieve any noticeable performance increase through balancing
Motor Re-builds: To allow for normal rebuilds, the motor may be over bored to a maximum of .5mm. Note: to remain in the Stock or Improved Category, any motor, which is rebuilt, must retain the stock compression ratio. If any procedures (such as truing the heads) change the compression ratio, cylinder spacers or other parts and/or techniques must be used to bring the motor back to stock compression ratio
Adjustments: Except as noted, any modifications for the sole purpose of facilitating adjustment of the car or the motor (such as modified valve adjusters) are permitted
Non-Performance Modifications: Any modification that is clearly not related to performance is permitted
Ok, I would use a 911 cooling system, maybe horizontal mounted with an external oil cooler and modified intake runners, but stock intake diameters. Just an idea. I would use a modern cam, that produces more hp, as most modern cams can produce more hp than the stock unit. Use the lightest stock parts, like the 8mm rockers with swivel foot on straight mounted shafts, use 94,5mm bore original Kolbenschmidt (as this is the rule), use a fuel regulator instead of the original non-regulating fule pressure holder. Redisigning of the C/C is helpful, as you can design it to modern aspects. If you would have a European engine sheet, why not updating the engine to a European config engine? If you can run a European engine, it would be very helpful!
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