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Greg Reimer 7376 · 10-29-2010, 11:25 PM

On the '68 3917290 327 head, the spec called for 68.9cc's, the OEM head was actually around 79 cc's, I found that it took around .008" per CC desired to get these heads down. I think it was around .078" to get it real close. It took .045" off the block to get the deck height where it belonged.Needless to say,the engine needed shorter pushrods and a distributor base shim. Also, .050" came off each side of the intake to make this whole thing work.

10-29-2010, 11:25 PM	#3
Greg Reimer 7376 VIP Member Join Date: Nov 2008 Location: Glendora,Calif. Posts: 1,135 Likes: 172 Liked 704 Times in 218 Posts	Re: combustion chamber volume On the '68 3917290 327 head, the spec called for 68.9cc's, the OEM head was actually around 79 cc's, I found that it took around .008" per CC desired to get these heads down. I think it was around .078" to get it real close. It took .045" off the block to get the deck height where it belonged.Needless to say,the engine needed shorter pushrods and a distributor base shim. Also, .050" came off each side of the intake to make this whole thing work.