Help

i have a p&p b18b head with crower 403 cams
i want to get a b20b block
i dont wanna loose that much compression so i wanna mill the head. with the paticular combination of head, cams, and block can i still get away wit a 3 thousands mill??

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its in the forum faq, read it
http://www.g2ic.com/forums/announcement.php?f=14