Technical Specifications of...

Merlin Rectangular 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 1.640" springs
Valve Size: 2.300” intake and 1.880” exhaust
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 (-2 models) or PC style (-3 & -4 models) valve seals, 1.550" (-2 & -3 models) or 1.640" (-4 model) Hardcore valve springs, Manley 7° chrome moly (-2 models), 10° chrome moly (-3 models) retainers and keepers . -4 models have 10° titanium retainers.
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 #1211, Mr. Gasket #121 or equivalent
Exhaust Gasket: Fel-Pro #1410 or equivalent
Head Bolts: 8 Longer than stock required (World #832015-8)