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More than likely they're large chambers but there is a bar code on the end of the heads, get the number from that and contact AFR - They'll tell you how they left.
Turn the heads upside down on your bench and put a level on them to make sure they are level. Get a serenge from your local drug store and use it to fill the chamber with liquid and total up the CCs...or call Toney on the phone..either one should work..