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  1. #1
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    21cc O-Ring Heads off 2001 2.5 Drag

    I am selling a set of 21cc O-Ring Heads off
    of a 2001 2.5 Drag motor.
    One cylinder has imperfections in one hole. Still used as is.

    $450 + Shipping

    NEW PRICE $390 + Shipping

    The 21cc are the more Gold colored set...C3.
    The other set is already sold.
    Thanks
    Greg
    616 283-8789 Mobile
    Click image for larger version. 

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    Last edited by G-Train; 06-06-2019 at 06:55 PM.
    "The Flying Clamato"
    ...This ain't no Party, This ain't no Disco, this ain't no foolin around..."Talking Heads - Life During Wartime"
    The G-Train has left the station.

  2. #2
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    What kind of compression did these heads yield on a drag block?
    15.5 cobra 175 hp merc - sold
    18 tahiti tiger O/B 200 hp merc - sold
    19 STV euro - 2.5 merc DRAG
    Seebold F1 tunnel - 2.0 F1/champ

  3. #3
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    I don't know exactly. Each compression tester will read slightly different.
    I would say 200psi plus or minus...that's a guess.
    Thanks
    Greg
    "The Flying Clamato"
    ...This ain't no Party, This ain't no Disco, this ain't no foolin around..."Talking Heads - Life During Wartime"
    The G-Train has left the station.

  4. #4
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    Quote Originally Posted by Brookbbb View Post
    What kind of compression did these heads yield on a drag block?
    Factory 21’s on a stock Drag should yield about 215
    Erik Kiser

  5. #5
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    Quote Originally Posted by patchesII View Post
    Factory 21’s on a stock Drag should yield about 215
    What about on a 260 block?
    15.5 cobra 175 hp merc - sold
    18 tahiti tiger O/B 200 hp merc - sold
    19 STV euro - 2.5 merc DRAG
    Seebold F1 tunnel - 2.0 F1/champ

  6. #6
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    Again, this is a guess, but if you use the thin head gasket, I would think it would cut it down around 15psi.

    You realize the O-Ring heads are cut for the block deck/head mating surface not using a conventional gasket, so there is a slight indent in the head that is the same diameter as the bore...
    "The Flying Clamato"
    ...This ain't no Party, This ain't no Disco, this ain't no foolin around..."Talking Heads - Life During Wartime"
    The G-Train has left the station.

  7. #7
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    TTT
    I have been told these will not work on a 280. The Bolt Pattern is a little different.
    Thanks for looking
    Greg
    616 283-8789 mobile
    "The Flying Clamato"
    ...This ain't no Party, This ain't no Disco, this ain't no foolin around..."Talking Heads - Life During Wartime"
    The G-Train has left the station.

  8. #8
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    17cc's on one of my 2.4's is 295 psi's. So it would be at least 220 to 260 psi's
    If I don't ask any questions, I'll never learn anything.

  9. #9
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    Quote Originally Posted by Krazymaan View Post
    17cc's on one of my 2.4's is 295 psi's. So it would be at least 220 to 260 psi's
    17’s on a 2.5 won’t get anywhere near 295. Thats more like a 240-250 lb head. A factory 21 equivalent o-ring head will make approximately 215-220 on a Drag. Little more than that on a 260.
    Erik Kiser

  10. #10
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    Erik do you think those 21cc heads on a 300drag with straight race fuel would be to much for lake use would that be to hard on the engine? Or stick with 26cc heads a little more conservative. Whats your thoughts thanks Frank

  11. #11
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    Me personally, if I’m cruising the lake I’d be on pump gas but if you’re just hitting sandbars to drag race on the 21’s will be fine. Ring and piston life will suffer. Rings would probably start going away in 75-100 passes
    Erik Kiser

  12. #12
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    New Price

    $390 + Shipping

    Thanks For Looking

    Greg 616 283-8789 Mobile
    "The Flying Clamato"
    ...This ain't no Party, This ain't no Disco, this ain't no foolin around..."Talking Heads - Life During Wartime"
    The G-Train has left the station.

  13. #13
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    Sold, Thanks S&F
    "The Flying Clamato"
    ...This ain't no Party, This ain't no Disco, this ain't no foolin around..."Talking Heads - Life During Wartime"
    The G-Train has left the station.

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