Block

• Seasoned 2-Bolt Main
• .040 in. overbore
• 2-piece rear main seal
• Mechanical fuel pump provisions
• Square and parallel decked
• Align honed main bearing bore
• Cylinders honed on a computer-controlled machine to within .0002 in. straightness and roundness
• Sonic tested cylinders for thickness

Rotating Assembly

• Cast steel crankshaft with 4 in. stroke
• Forged 6.123 in. Magnum connecting rods with 150,000 psi bolts
• Forged pistons with a 23 cc Dish 
• Compression Ratio
  • 58 cc Heads - 10.3:1
  • 65 cc Heads - 9.7:1
  • 68 cc Heads - 9.4:1
• Externally balanced rotating assembly balanced

Notes

• Requires a Magnum 360 weighted balancer and a LA360 rear balance
• Block oils valvetrain through the pushrods only
• Accepts LA, Magnum based, and aftermarket heads that use pushrod oiling and pushrod oiling accommodating rockers and valvetrain
• Not for use in emission or pollution controlled vehicles
• 12-month warranty