Many special Hi Po cars were built to meet the racing requirements
NHRA required 50 cars for Super Stock class
SCCA required 100 cars for some classes and some like Trans Am was 1000
NASCAR required 200 cars for some and 6000 for others and had other rules
FIA and SCCA had some rules for parts that had to be pre-approved before racing
When FIA and SCCA approved the ZL1 engine for competition in the Corvette, it did not require a minimum number of cars built
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