OEM 3904391 GM Big Block Chevy Rectangular Port Head 67 396/375 427/435 HP J106

Description

This is an original GM cylinder head for Big Block Chevy engines. The casting number is 3904391. This head has the high performance rectangular intake ports and closed combustion chambers. The 3904391 cylinder head was used exclusively on 1967 L78 396/375HP and L71 427/435HP engines. That's right, this is a 1967 only cylinder head that was only used on the L78 396 and L71 427 engines. The date code on this head is J 10 6 which decodes as October 10th, 1966. This is an extremely hard to find early dated head.
This head is in good condition overall and will need some repair before it can be used. On the plus sides, there is no porting on the intake ports and only minor rounding on the outer edge of the exhaust ports. The head has no cracks or repairs. The deck surface is very thick and there are no bad threads or thread repairs. At some point, someone attempted to change the combustion chambers to the open design. On one chamber they cut through to the water jacket as shown. The two modified chambers will need to be welded back to stock. This head is posted well below the normal price to allow for the repairs to be made. Don't miss this awesome head!
This is your chance to own the real deal early dated 3904391 head you have been dreaming about at a GREAT PRICE! Don't Miss Out!
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