Skip to product information
1 of 3

Mountune USA

Forged Piston Set, Lotus Twin Cam 84.5mm - Stroker

Forged Piston Set, Lotus Twin Cam 84.5mm - Stroker


Regular price $999.00
Regular price $1,100.00 Sale price $999.00
Sale Sold out

Engineered in house and manufactured by CP/Carrillo, these motorsport grade forged pistons are designed to be used with a 77.62mm stroke crankshaft and 4.925" C to C length connecting rods. The pistons feature a 1.341” compression height allowing this setup to fit within a Lotus Twin Cam block. The added stroke provides a nice increase in engine torque while allowing the engine to rev freely resulting in the the perfect street, fast road or track day combination.

Dome height is set at .057” providing a nominal compression of 10.5:1 allowing the engine to run on 91 octane fuel or higher. Large valve pockets are also included to accommodate high lift camshafts and large valves. Modern piston ring design ensures maximum sealing. 

Engine Displacement Bore: 84.5mm x Stroke 77.62mm -  1741cc

Your engine block will require machining, contact us for details.

  • Made in the USA
  • Bore 84.5mm / 3.327"
  • Compression height 1.341"
  • Dome height .057" (2.67cc)
  • Pin diameter .812"
  • Pin Oiling feature 

Return Policy

You have 7 calendar days to return an item from the date you received it. To be eligible for a return, your item must be unused and in the same condition that you received it. Your item must be sealed in the original packaging. Your item needs to have a receipt or proof of purchase. Some exclusions apply.

For additional details see our Return & Refund Policy.

Installation Guides

To see all available installation and break-in instructions, click here.

Disclaimers & Legal

This part has been designed and is intended for off-highway application only. Installation of this part on a vehicle that is driven on public roads may violate U.S. and Canadian laws and regulations relating to emission requirements and motor vehicle safety standards.

Click Here for emissions compliance information.

California Residents Prop 65 Information
California’s Proposition 65 entitles California consumers to special warnings for products that contain chemicals known to the state of California to cause cancer and birth defects or other reproductive harm if those products expose consumers to such chemicals above certain threshold levels. This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

For more information visit

View full details
  • Free Shipping Sitewide

    Orders of $100.00 or more are eligible for free ground shipping within the lower 48 US states. Some restrictions apply.

    Learn More 
  • Earn Rewards With Every Purchase

    Simply sign up for free and start earning points for every purchase you make. Redeem your points for discounts or exclusive mountune merchandise.

    Learn More