Proflow Cylinder Heads, AirMax 205, SB Ford 302, 351C, Bare

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.

SPECIFICATIONS

Material:                                         356 Alloy, T6 

Chamber Volume:                          68cc

Intake Runner Volume:                  207cc

Intake Port location                        raised .100" over stock

Minimum Cross Section:               2.18 square inches MCSA 

Exhaust Runner Volume:             125cc - high velocity

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

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

                                                    Exhaust 1.650” (45 degree seat custom high velocity radius/blended) 

Valve Guide Angles:                   Canted Valve angles

                                                    Intake 10.0 x 4.0 degrees

                                                    Exhaust: 9.5 x 3.0 degrees 

Valve Guides:                            Bronze .502” od x 11/32” stems .570" shoulder

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

                                                    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)

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

Head Bolts                                  Accept oem length bolts or studs