Compression Ratio
12.2:1 w/ 65 cc heads
10.8:1 w/ 74 cc heads
9.5:1 w/ 85 cc heads
Features include:
• Unique dome shape designed to work with early 85cc 5.7L heads, the 2009+ 65cc 5.7L heads,
as well as the 74cc 6.1L cylinder heads
• Cylinder head interchangeability, combined with the variety of stock and aftermarket gasket
thicknesses, a large number of compression ratio combinations are achievable. CR
calculations below are using the stock 0.027” gasket thickness
• Optimized ring lands for maximum durability in power adder applications
• 2618 alloy and anodized top ring groove for increased high temperature strength and durability
• 1.0, 1.0, 2.0mm ring set included; HV385 steel top, steel napier 2nd & STD tension oil rings
• Dual coated with phosphate and MAHLE’s Grafal® skirt coating for reduced drag and wear