Proflow Cylinder Heads, SuperMax 225, SB Ford 302, 351C, Bare

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Proflow does not sacrifice quality for a low price–you get both with our aluminium cylinder heads. The lightweight heads are cast from A-356 aluminium alloy with a large choice of Engine, for SB & BB Chevrolet, LS Chev Holden Ford SB 289-351W, 302,351 Cleveland 2V & 3V & BB FE, and Chrysler SB & BB, phosphorous bronze valve guides, and ductile iron valve seats for use with unleaded gas. They’re also end-milled and drilled for accessories. The fully assembled heads have stainless steel valves, High Performance valve springs, 7 degree valve locks, rocker arm studs, and guideplates. Perfect for your Mild or High performance Hot Rod.

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Material:                                         356 Alloy, T6 

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Chamber Volume:                           72cc

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Complete Assembly options available in all chamber sizes

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Intake Runner Volume:                  231CC

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Intake Port location                        raised .125” 3V design 

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Minimum Cross Section:               2.53 square inches MCSA 

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Exhaust Runner Volume:             125cc – high velocity

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

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Valve sizes                                  Intake 2.10” (45 degree seat, custom 5 angles)

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                                                     Exhaust 1.650” (45 degree seat ) 

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Valve Guide Angles:                   Canted Valve angles

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                                                    Intake 10 x 4 degrees

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                                                    Exhaust: 9.5 x 3.0 degrees 

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

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

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                                                    Exhaust: 1.680” x 1.430” x 3/8 

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Spark Plugs:                               relocated for efficient fast burn

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                                                    ¾ reach, 5/8 hex, washer seat (NGKBCP7ES) 

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Spring Pads:                              1.570” od/.560” id 

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

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

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Rocker Arm Studs                      7/16” unc

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

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Ext Water Port                             Heads have 3/4 npt tapped hole on each end which need to be plugged if not used

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Head Bolts                                  Accept oem length bolts or studs 

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