Direct Connection ( Mullen LA ) heads

And once you start to calculate what cars weigh in the classes things do get interesting. Right now the fastest car in S/S is a Mercury Cylcone (probably FE for maximum 364 C.I. for 3K pounds). But minimum weight for any combination is 3000 pounds, so that does keep things from getting too "Frankenstein" in super stock. Things get pretty liberal once you move up into B or A gas.