[76GMC1500]

Low compression heads... *Using a low compression head reduces the fuel octane requirements of the motor. It also reduces fuel economy and horsepower.

I believe the compression ratio for a 2-stroke is actually the dynamic compression ratio. *A static compression ratio is the volume of the cylinder at BDC over the volume of the cylinder at TDC. *A 2-stroke dynamic compression ratio takes the volume of the cylinder when the exhaust port closes and divides it by the volume of the cylinder with the piston at TDC.

Lowering the compression ratio, raising the exhaust port in the cylinder so it closes later, increases the top end performance of a 2-stroke motor. *Lowering the exhaust port increases the bottom end. *Since the loopers are high rpm motors, they run low dynamic compression ratios.