• Fits 302/351 Windsor engines
• Cast from prime A356 T6 aluminum
• Heads are cast with high-flow ports
• 20 degree inline valves
• Suggested valve sizes: 2.02" intake and 1.60" exhaust
• Steel alloy intake and exhaust valve seats
• Manganese-bronze valve guides
• 63cc CNC'd combustion chamber
• Intake port volume as cast: 204cc
• Exhaust port volume as cast: 85cc
• Bare head weighs 27 lbs.
• Accepts both tapered seat and gasket style 14mm spark plugs (Motorcraft AGSP-32-PP, Autolite 3924, 3925)
• Requires M-6564-F351 1.65:1 or M-6564-G351C 1.5:1 ratio roller rocker arms with .150" offset intake pushrod cup (not included)
• Raised exhaust port exit, custom headers may be required

Assembled Head Features

• Premium stainless steel 2.02" intake M-6507-A304 and 1.60" M-6505-B304 exhaust valves
• Uses M-6513-BH conical style valve springs with machined retainers and machined valve locks. Most hydraulic cams can be used with these springs. 142# @ 1.750", 318lbs. @ 1.200" and CB @ 1.150"
• Includes laser cut guide plates M-6566-Z304D for use with 5/16" pushrods and 7/16" rocker studs
• Check piston to valve clearance including radial valve clearance before installing these cylinder heads on your engine

Ported Head Features

• CNC ported version of M-6049-Z304D cylinder head to increase flow on intake and exhaust
• Intake and Exhaust airflow increased approximately 10%
• Bare casting
• Uses Felpro® exhaust gasket part number 1487