Author Topic: stock Predator 420 Head cc  (Read 1334 times)

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Offline ScarryLarry

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stock Predator 420 Head cc
« on: April 18, 2019, 01:43:52 PM »
Trying to get a rough estimate for compression. Shooting for13.5-140.



Offline ScarryLarry

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Re: stock Predator 420 Head cc
« Reply #1 on: June 11, 2019, 07:29:51 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.