NEW PORT AND CASTING UPGRADE  NOW IN STOCK

AFD SP4V 225cc FORD ALLOY CLEVELAND CYLINDER HEADS
SOLD AS A PAIR (2) CYLINDER HEADS

Material:                                         356 Alloy, T6 

Chamber Volume:                         55cc,  58cc, 60cc, 64cc, 68cc, 72cc, 76cc options

Complete Assembly options available in all chamber sizes

Intake Runner Volume:                  225CC

Intake Port location                        raised .125” 3V design 

Minimum Cross Section:               2.53 square inches MCSA 

Exhaust Runner Volume:             125cc - high velocity

Exhaust Port Location                 Raised .080” (near stock location) 

Valve sizes                                  Intake 2.190” (45 degree seat, custom 5 angles)

                                                     Exhaust 1.650” (45 degree seat ) 

Valve Guide Angles:                   Canted Valve angles
                                                    Intake 10 x 4 degrees
                                                    Exhaust: 9.5 x 3.0 degrees 

Valve Guides:                             Manganese Bronze .502” x 11/32” stems  

Valve Seat Inserts:                     Intake: 2.250” x 1.880 x 3/8 (Durabond 7000)
                                                    Exhaust: 1.680” x 1.430” x 3/8 

Spark Plugs:                               relocated for efficient fast burn
                                                    ¾ reach, 5/8 hex, washer seat (NGKBCP7ES) 

Spring Pads:                              1.570” od/.560” id 

Valve Spring Height:                  1.960” (with stock length valve) 

Pushrods                                    5/16” or 3/8” (check required length)

Rocker Arm Studs                      7/16” unc

Rocker Arm Type                        7/16” stud mounted roller rockers (1.73 ratio) or Yella Terra Planuim #6321 OR T&D shaft rocker sysytems