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Mountune Racing Engines

Lotus Twin Cam Weber Cylinder Head, Sprint Road Port w Seats and Guides.

Lotus Twin Cam Weber Cylinder Head, Sprint Road Port w Seats and Guides.


Regular price $4,999.00
Regular price $4,999.00 Sale price $4,999.00
Sale Sold out

Replace your tired and worn Lotus Twin Cam cylinder head with all new casting designed and produced to the highest modern standards. This head is cast from modern LM25TF aluminum and like all modern engines, separate camshaft bearings are not required. Each head includes valve seats and Colsibro valve guides for years of trouble free service. CNC machined combustion chambers ensure matching volume across all four cylinders. This head is set up for "Sprint" intake valves and standard exhaust valves. We can also provide heads fully assembled. contact us for details. Lotus Europa version is also available, please contact us. 


  • New LM25TF Casting to original dimensions
  • Cam bore machined into head (No cam bearing required)
  • Inlet port as cast 1.14 diameter 40mm Weber at manifold
  • Inlet Valve seat cut for 1.560 diameter valve- (Inlet valve not included)
  • Exhaust port as cast 1.25 dia
  • Exhaust valve seat cut for 1.325 dia valve - (Exhaust valve not included)
  • Colsibro valve guides fitted finished for 5/16 valve stems
  • Combustion chamber machined
  • Standard spark plug 14mm
  • All core plugs fitted
  • Full pressure test 
  • Head supplied fully machined with valve guides and valve seats cut and cam caps 
  • Cam cap studs and fasteners included 
  • Made in the UK


All Lotus Twin Cam Engines

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.

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