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gas vs M/P vs altered
A B or C was weight/displacement ratio
altered cars could move the motor freely cut frame longer or shorter and use any custom motor and fuel [nitro] plus superchargers
also same class rules limited to alcohol
gas could swap built motors but were limited to 10% rearward placement and limited to GASoline
superchargers legal
M/P had to use same brand motor in the same place ? but allowed mods inc head work cams intake carbs no superchargers or fuel or NOX aka hopped up stock
NHRA LEGAL STOCK class had lots of legal mods like headers traction bars jacked stance ect
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