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TDC/DOHC chamber volume & piston specs

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  • #1

    TDC/DOHC chamber volume & piston specs

    I searched this and couldn't find anything...

    What are the chamber volumes of early and late TDC/DOHC heads?
    Dish/dome/valve relief volume in pistons?
    Compression height of pistons?

    I'm trying to complete the table I posted in this thread:
    404 Not Found
    http://www.60degreev6.com/index.php?name=PNphpBB2&file=viewtopic&t=3678


    Thanks.
    Current:
    \'87 Fiero GT: 12.86@106 - too dam many valves; ran 12.94 @ 112 on new engine, then broke a CV joint
    \'88 Fiero Formula: slow and attention getting; LZ8 followed by LLT power forthcoming
    \'88 BMW 325iX: The penultimate driving machine awaiting a heart transplant

    Gone, mostly forgotten:
    \'90 Pontiac 6000 SE AWD: slow but invisible
    Tags: None
  • #2
    91 CC is 54, 96 CC isw 51.5

    Valve relief for 91-95 auto is ~5 cc
    Ben
    60DegreeV6.com
    WOT-Tech.com

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    • #3
      Thanks.
      Same valve reliefs in the manual trans engines? Isn't the compression ratio slightly lower on the auto trans cars? How do they manage that? head gaskets?
      Current:
      \'87 Fiero GT: 12.86@106 - too dam many valves; ran 12.94 @ 112 on new engine, then broke a CV joint
      \'88 Fiero Formula: slow and attention getting; LZ8 followed by LLT power forthcoming
      \'88 BMW 325iX: The penultimate driving machine awaiting a heart transplant

      Gone, mostly forgotten:
      \'90 Pontiac 6000 SE AWD: slow but invisible

      Comment

      • #4
        The manuals had 9.5, the autos 9.25. I thought it was the pistons, but apparently the shop that built my motor only had 1 part number for 1992, and it was for a 9.5:1 piston.

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