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OEM GM 3964291 Big Block Chevy Rectangular Port Head 396 454 Closed Chamber NICE
OEM GM 3964291 Big Block Chevy Rectangular Port Head 396 454 Closed Chamber NICE
OEM GM 3964291 Big Block Chevy Rectangular Port Head 396 454 Closed Chamber NICE
OEM GM 3964291 Big Block Chevy Rectangular Port Head 396 454 Closed Chamber NICE
OEM GM 3964291 Big Block Chevy Rectangular Port Head 396 454 Closed Chamber NICE
OEM GM 3964291 Big Block Chevy Rectangular Port Head 396 454 Closed Chamber NICE
OEM GM 3964291 Big Block Chevy Rectangular Port Head 396 454 Closed Chamber NICE
OEM GM 3964291 Big Block Chevy Rectangular Port Head 396 454 Closed Chamber NICE
OEM GM 3964291 Big Block Chevy Rectangular Port Head 396 454 Closed Chamber NICE
OEM GM 3964291 Big Block Chevy Rectangular Port Head 396 454 Closed Chamber NICE
OEM GM 3964291 Big Block Chevy Rectangular Port Head 396 454 Closed Chamber NICE
OEM GM 3964291 Big Block Chevy Rectangular Port Head 396 454 Closed Chamber NICE

OEM GM 3964291 Big Block Chevy Rectangular Port Head 396 454 Closed Chamber NICE

$ 237.07

Availability: 100 in stock
  • Brand: 427 L71 L-71 L72 L-72 COPO YENKO 840 L78 L-78
  • years: 67 68 69 70 71 72 3964291 375HP 375 HP 425 425hp
  • Surface Finish: 3856208 3873858 3904391 3904392 3919842 65 66
  • Returns Accepted: Returns Accepted
  • Other Part Number: 1968 1970 1966 1965 1968 1969 1970 Yenko COPO
  • Item must be returned within: 30 Days
  • Part Brand: 3919840 Square port hi perf high performance LS6
  • Manufacturer Part Number: Chevrolet BBC Rectangle
  • Condition: This is a single original GM cylinder head for a Big Block Chevy Engine. The casting number is 3964291. This head is the high performance version with rectangular intake ports and closed combustion chambers. This head was used by GM on late 1969-1970 L78 396/375HP, L71 427/435HP, and 427/425HP(450HP) L72 engines which were used on Yenko and COPO cars. This head was also original equipment on the 1970 LS6 454/450HP engines. This head was also used as a direct replacement for casting numbers 3856208, 3873858, 3904391, and 3919840. What a rare find!This head is in good rebuildable condition as shown. It was recently taken to a machine shop where it was cleaned and magnafluxed to check for cracks with none found. The ports are still stock size with with smoothing/deburring as shown. All threads are in good condition with no helicoils or thread inserts. There is one void on the deck surface from a blown head gasket as shown that will need to be welding during the rebuild process......
  • Interchange Part Number: 427 Camaro Chevelle Nova Corvette Impala 396 454
  • Refund will be given as: Money Back
  • Return shipping will be paid by: Buyer
  • Restocking Fee: No

    Description

    This is a single original GM cylinder head for a Big Block Chevy Engine. The casting number  is 3964291. This head is the high performance version with rectangular intake ports and closed combustion chambers. This head was used by GM on late 1969-1970 L78 396/375HP, L71 427/435HP, and 427/425HP(450HP) L72 engines which were used on Yenko and COPO cars. This head was also original equipment on the 1970 LS6 454/450HP engines. This head was also used as a direct replacement for casting numbers 3856208, 3873858, 3904391, and 3919840. What a rare find!
    This head is in good rebuildable condition as shown. It was recently taken to a machine shop where it was cleaned and magnafluxed to check for cracks with none found.  The ports are still stock size with with smoothing/deburring as shown.  All threads are in good condition with no helicoils or thread inserts. There is one void on the deck surface from a blown head gasket as shown that will need to be welding during the rebuild process
    . This area is not cracked, it just has a depression that was caused by the blown head gasket as shown. I priced the head with the required repair in mind. This is a very nice original 3964291 head.
    This is your chance to own an awesome HI PERF Big Block Chevy head for your special engine or collection at a great price. Don't Miss Out!
    Check out my other listings for more rare and hard to find parts.
    The shipping cost shown is for the continental US. Alaska, Hawaii, and territories please inquire for a shipping cost.