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greg_e greg_e is offline
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Posts: 10
Join Date: Dec 2019
Car: 2007 BMW 335i
Default 09-18-2020, 10:08 AM

You can’t add more material to the head to increase compression. CR is mainly done through the pistons. I recently built my motor with 9.5:1 CP pistons and CP rods for high boost, corrections through timing will allow you to run more boost safely and make more power

To answer your question, no you can’t increase CR through the head, if anything it’ll lower it more. If you want 10.2:1, get new pistons
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