Heymow - Lawnmower Racing Forum

Engine Help => Honda and Clone Engines => Topic started by: ScarryLarry on April 18, 2019, 03:43:52 pm

Title: stock Predator 420 Head cc
Post by: ScarryLarry on April 18, 2019, 03:43:52 pm
Trying to get a rough estimate for compression. Shooting for13.5-140.
Title: Re: stock Predator 420 Head cc
Post by: ScarryLarry on June 11, 2019, 09:29:51 am
For all a stock hemi 420 is about 35cc. After I cut .045 in the head for .030 pop out of piston I smoothed and polished the chamber I got 40cc. Now with a .030 pop out piston, .020 head gasket and 40 cc head I have 13.56 to 1. Let tell you the engine runs strong.