Technical Specifications of...
Merlin Oval Port Cylinder Heads

Material: High density cast iron
Valve Seats: Integral intake, hardened steel exhaust
Valve Guides: Integral cast iron
Valve Spring Seats: Machined for 1.550" springs
Valve Size: 2.300" x 1.880"
Rocker Arm Studs: 7/16" shank, screw-in style with hex shoulder furnished with assembly
Exhaust Flange: Stock port location. Includes accessory bolt holes
Included In Base Assembly: Manley stainless steel valves with swirl-polished heads, umbrella style valve seals, 1.550" Hardcore valve springs, Manley 7° chrome moly retainers and keepers .
Recommended Installation Items:
Head Gaskets: Fel-Pro #1017-1or equivalent
Pushrods: Requires heat-treated stock length pushrods
Spark Plugs: Accepts 14mm .460" reach 5/8" hex tapered seat Accel 276 or equivalent. Heat range may vary. Consult with engine builder.
Intake Gasket: Fel-Pro #1212 or equivalent for Oval Port
Exhaust Gasket: Fel-Pro #1410 or equivalent
Head Bolts: 8 Longer than stock required (World #832015-8)