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Head gasket question from OLD gearhead

Discussion in 'Engine Building' started by sdj02, Mar 5, 2009.

  1. sdj02

    sdj02 New Member

    Likes Received:
    Aug 21, 2008
    Ok. I am helping my son build a D16Z6 for use with a turbo. He bought this motor all machined and ready to build. The pistons say 0.50 on top of them. I am assuming this is 0.50 over bore, but I am an old Chevy race motor builder and new to the import sport. He has been told he has to buy a $150 head gasket for the bigger pistons. We never had to buy a different head gasket back in the old days. Is this true or is someone just telling him this because it is their opinion? I want to build this thing right, but I don't want to spend money where we don't have to either. I know the block has been bored, and decked. Any help would be appreciated. I am an old guy trying to help my young import loving son. :) Thanks for any info.
  2. boostin4fun

    boostin4fun Boosted ls/vtec ohh yeah!

    Likes Received:
    Jun 22, 2006
    The pistons are probably .20 over making them a .5mm oversized. I have used factory sized headgaskets with .20 over blocks many times with zero problems. My advice is to get a oem headgasket from honda they are very tough. But if it really bothers you, you can get a headgasket from Cometic that is opened up a little more. But like I said it really isnt necessary.
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