This replacement cylinder head is specifically designed for Mercruiser-Volvo Penta 4.3L V6 Vortec engines with an 8 bolt intake.Vortec Design 8 Bolt Intake, Replaces Casting # 12557113 – ASSEMBLED. Made from the highest grade cast iron.
 Assembled heads include:
100% New OE type valves, seals, valve springs, and retainers
(OHC assemblies do not include cam & lifters)
All cylinder heads outperform their competitors!
Thicker deck for greater strength
Improved design resists cracking
Superior port finish for increased flow
Water flow redesigned for greater thermal conductivity
Hardened exhaust seats
CNC machined guides and seats
25-point quality check on every head
3-angle valve finish
Competitive pricing
Casting / OEM:
12557113
  Make your engine run smoothly again with this high-quality replacement cylinder head.