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#1
01-13-2003, 04:32 PM
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The 670 head came on 67 GTO,s and 400 firebirds and maybe some others. They have big valves and small closed chambers around 72 cc,s. A good head for a 400 if you can stand 10:1 compression. A trick some guys do is open up the chambers to resemble an open chamber head. Drops the compression and improves breathing.
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