Model Trucks › MACK E-6 2 VALVE TIP TURBINE ENGINE KIT, EN18 Image 1 of 2 Image 2 of 2 MACK E-6 2 VALVE TIP TURBINE ENGINE KIT, EN18 $35.00 sold out 1/24TH - 1/25TH SCALE CAST RESIN ENGINE KIT. 285-350 HP 2 VALVE ENGINE WITH WET CLUTCH AND REAR MOUNTED PTOBY AITM Sold Out Added! 1/24TH - 1/25TH SCALE CAST RESIN ENGINE KIT. 285-350 HP 2 VALVE ENGINE WITH WET CLUTCH AND REAR MOUNTED PTOBY AITM