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tech notes

  • Fits 302/351 Windsor engines
  • Cast from prime A356 T6 aluminum
  • Heads are cast with high-flow ports
  • 20 degree inline valves
  • Premium stainless steel lightweight 7MM 2.02" intake M-6507-D3047 and 1.60" M-6505-D3047 exhaust valves
  • Uses PAC 1219X conical style valve springs with machined retainers and machined valve locks. Most hydraulic cams can be used with these springs.

    ·       Valve spring closed pressure - 145 lbs. @1.800"

    ·       Valve spring open pressure - 358 lbs. @ 1.175"

  • Includes laser cut guide plates M-6566-Z304D for use with 5/16" pushrods and 7/16" rocker studs
  • 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
  • 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
  • Check piston to valve clearance including radial valve clearance before installing these cylinder heads on your engine
  • Uses Felpro® exhaust gasket part number 1487





Package Dimensions:
7.5 x 9.5 x 21.5
Package Weight:
31.8 lbs
Part Type:
Engine: Cylinder Heads
Instruction Sheet:
Not Available
Warranty Availability:
Not Available
Country of Origin:
United States
UPC Code:
Catalog Page Number: