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Thread: BBC head casting number?

  1. #1
    Timer
    I pulled the valve cover off and found this cast on the inside head surface: HI-PERF and G272990. What does this say about the head, if anything? Thanks.

  2. #2
    GofastRacer
    You have square port open chamber heads, 118cc chambers...... http://free.***boat.net/ubb/cool.gif

  3. #3
    Timer
    Thanks, Gofast. I assume that's good since I've heard good things about the older open-chamber heads. Are these the best cast iron heads I could have ended up with?

  4. #4
    Senior Member
    Join Date
    Feb 2009
    Posts
    2,626
    Timer, those heads are still available through Chevy under part #6260482. The GM Performance Parts catalog states "This is Chevrolet's best cast iron cylinder head for high-performance big block V-8's"

  5. #5
    Timer
    Thanks, OLDSQUIRT.

  6. #6
    BlownChevy
    Try, WWW.MorTec.com (http://WWW.MorTec.com) for more info on your heads and other chevy stuff... it gives you casting numbers

  7. #7
    GofastRacer
    Originally posted by Timer:
    Thanks, Gofast. I assume that's good since I've heard good things about the older open-chamber heads. Are these the best cast iron heads I could have ended up with?
    Yes, they are the best factory iron heads...

  8. #8
    HammerDown
    Damm, I thought the 049's were the best G.M. Heads????

  9. #9
    Timer
    That's a slick site, BlownChevy. Thanks.
    I guess my "G" is really a "6".
    I found the quote in the catalog to which OLDSQUIRT refers. It mentions that the exhaust ports are square. When I took off the Bassetts on one side, I noticed the ports were round. Could it be that there has been some grinding done to go from square to round? Seems like that's the only explanation.

  10. #10
    Costello
    They are square at the intake side, exhaust ports are round.

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