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Piston Set 81mm 11.5 Big Valve 1750 1mm Over, 1830cc NEW! Dish Dome SUPERLITE

Under head milling reduces weight to 355g (49g).


  • Dished dome makes more power. Flame front travel distance is minimized when compressed charge concentrated directly under spark plugs combustion efficiency is improved.
  • Tall shoulders of dome "squash" the mixture at TDC creating a hurricare to distribute the flames.

We have been working with the people at JE on our pistons since 1978. Through our racing engine research and on track experience we have continuously modified our designs for better performance. We won four SCCA National Championships using the same pistons you can now buy off our shelf. Professional engine builders all over the world use our pistons.

  • Compression of 11.5:1 is measured with standard head of 112mm height and 1.4mm Reinze gasket.  (For Fuel Octaine Requirements go to "Additional Product Information" Section)
  • Deeper valve relief to accomodate most performance cams.
  • Larger diameter valve reliefs will accommodate oversize 42.5mm intake and 38mm exhaust valves.

    Our 81mm, 11.5:1 1750 piston set was developed while winning three SCCA National Championships. The only change is the larger diameter valve reliefs to accommodate the vintage racers that are not confined to standard valves. The standard 80mm liners can be bored to 81mm.

    We also offer these as Piston/Liner Sets.

    This piston set includes standard wrist pins (109 grams) and conventional Total Seal Ring Set rings. You should consider the following upgrades:

    • Upgrade to light weight pins (77 grams) for an additional $80.00
    • Upgrade to Total Seal gapless second ring set for more HP.  $133.50 extra
    • Upgrade to Total Seal gapless top ring set for even more HP. $169.75 extra
      (check out HP gains at
      Total Seal HP Gains)
    • Ceramic dome heat coating and Teflon skirt coating $188.00 extra.  Dome coating holds heat in combustion chamber for more power. This ceramic shield prevents heat transfer to the underside of the piston and reduces oil temperature. Reduced skirt friction decreases parasetic HP loss. Teflon skirt coating only $108.00

    If we do not stock the appropriate compression piston for your engine needs, we will be delighted to help you with a special order set. We also sell single pistons and pins if you damage one and need a spare.   Please call us for more information. 1-800-552-ALFA.

  • For more information, please visit this product's webpage.
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