This is the third in a multi-part series covering the custom 422 cubic-inch stroker engine build performed by master engine builder Bill Trovato at BTR Performance for our turbocharged 1971 Olds project called the "S71". In this installment, Trovato discusses rear main seals and installing JE pistons onto Lunati H-Beam connecting rods using spiral locks. Although this video series features and Olds engine, the valuable, race-proven techniques shown by Trovato apply to any performance engine build.