Related Photo Galleries
Using a 3.796-inch sleeve, we slid the assembled pistons and rods into their holes. We whipped out our trusty compression ratio calculator, punched in the data and came up with an effective ratio of about 11.5:1. The key to hitting this number was moving from the 5.3L to the 4.8L flat top pistons. On 91 octane, with proper tuning by Turn Key, there was zero detonation.