Pettis Performance 598ci Big-Block - Big, Wild, & Nasty Part two Photo Gallery
One of the first specs that Pettis measures on any engine build is to verify the camshaft lobes. It is critical that he verifies the camshaft because of the many measurements and adjustments that are made to the heads, valvetrain, and pistons. Each adjustment is based on the camshaft specs and if those are wrong, it will be a lot of wasted time and effort. The only specs Pettis admitted to were 0.950/0.900-inch lift; the duration was over 280 degrees and 310 degrees, intake and exhaust respectively at 0.050-inch lift. The lobe separation was also wider than 116 degrees. Comp Cams is responsible for cutting the custom profile.