01-05-2009, 02:45 pm
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| Corvette Enthusiast Join Date: Dec 2008 Posts: 3
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|  Head type
How can I tell what kind of Heads I have on my 1975 350 4-speed? I do not believe it is original (Heads or engine) I took off the valve covers and the number is 3973487 It also had "GM 11" in the center of the head as well On the front of the drivers side head it has 816 stamped into it, what does that mean? The Vette is a 1975 4 speed coupe, the engine block is 3970010 Can you help me understand what this is and are these heads 1.72, 1.94, 2.02, etc...???? Any help with this is greatly appreciated!!!!!!! Thanks!!!!!! | ||||||||||||||||||||
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01-05-2009, 07:39 pm
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| Master Technician  Join Date: Nov 2006 Location: south of boston Posts: 171
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to the best of my knowledge they are 71-72 1.94 or 2.02 could be either with 75 cc chambers Steve
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bradfordsvettes|
01-10-2009, 08:43 am
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| Corvette Enthusiast  Join Date: Nov 2006 Location: pittsburgh, pa Posts: 642
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just google chevy heads 3973487. there is also a date code casted into the head under the valve cover to. should be something like c75 for march of 75. from the 30 seconds i put into this, they appear to be 72cc smog heads. nothing special. http://www.73-87.com/chevy_ids/sbheads.htm http://www.73-87.com/chevy_ids/sbcid2.htm Castings and Codes Chevrolet Head Casting Number Reference 3973487 chevy heads flow numbers | ||||||||||||||||||||
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