The Lotus block features an all new grey iron casting that is stronger than the original and accepts the Lotus cylinder head. WARNING: This part is designed and intended for competition use only. It should not be installed on a vehicle that is driven on public roads and highways. Installation of this art on a vehicle driven on public roads and highways is likely to violate U.S. and Canadian laws and regulations relating to motor vehicle emissions.

• Center Main Accepts Upper/Lower Crankshaft Thrust Bearing Inserts
• Machined/Delivered w/Cyl. Bore Semi-Finished at 3.228-3.226 Dia.
• Standard 7.800 in. Deck Height w/Extra Material For Decking
• Select Areas Around Main Bearing Webs Strengthened
• Lower Clutch Housing Bolt Bosses Reinforced
• Block Case from 40000 PSI Gray Iron
• Lifter Bore Dia. 0.5155-0.5145 in.