1-5/8 x 1-3/4″ STEP Small Block Headers

67-76 A-BODY, 62-79 B-BODY, 70-74 E-BODY, 76-80 F-BODY and 77-88 M-BODY

STANDARD-PORT:  273, 318, 340, 360, 402 crate, 408 MAGNUM CRATE, 440 SUPER COMMANDO CRATE

EARLY FACTORY SMALL-PORT:  273*, 318* (Modification required for proper seal)

• Early factory small-port head:  Port diameter 1.09w x 1.55h

• Standard-port head:  Port diameter 1.30w x 1.80h

*Special-Order:  Additional material will be added to the flange ports for headers to seal properly.  Special-Order lead-time, 6-8 weeks (modification and coating process)

STRAIGHT or ANGLED

COILOVER without torsion bars:  The following coilover systems have been fit-checked with these headers and found there to be no clearance issues…  RMS Alterktion, Magnumforce Tubular, Magnumforce Modular Transformer, Control Freak

•  Steering Linkage:  OEM with torsion bars or Rack & Pinion without torsion bars.

•  67-76 A-bodies Only / Steering:  This header will not clear a Quick/Fast Ratio Pitman & Idler arm that is longer than the OEM arms.  Example; The Fast Ratio Pitman & Idler arms by Firm Feel, Inc. are 3/4″ longer then stock.  DIY clearance can be achieved by dimpling the header tube(s), however, doing this modification will void your header and coating warranty.  (This note pertains to 67-76 A-bodies only.  Headers will fit B & E body applications with Quick/Fast Ratio arms.)

•  Headers will not clear UniSteer Performance Rack and Pinion.

OEM

•  Headers fit with Schumacher Creative Services engine mounts or equivalent.

YES 

•  Floor Shift:  Some applications may require the adjustable swivel & the lower rod to be re-positioned to clear the header collector.  See illustration sheet #3703

YES

•  Flywheel:  Applications with an 11″ flywheel, 143-tooth ring gear must use a RobbMc Performance starter #3005.

• Clutch Linkage:  OEM   (!) 67-76 A-body applications may require a modified Z-bar.  [Modified Z-bar sold separately #ZB340]

• Keisler Tremec TKO-500/600 Transmission:  Correct installation is imperative.  The output-end of the tail shaft must be in exactly the same position as the stock transmission output shaft for the headers to fit properly.

YES

•  Auto Trans:  Some applications may require the adjustable swivel & the lower rod to be re-positioned to clear the header collector.  See illustration sheet #3703

YES

•  71-74 B-body & 70-74 E-body applications may require a modified Torque Shaft Assembly.  Torque Shaft Assembly sold separately #B7174TSA]

YES

YES, POWER-STEERING or MANUAL STEERING

•  67-76 A-bodies Only / Steering:  This header will not clear a Quick/Fast Ratio Pitman & Idler arm that is longer than the OEM arms.  Example; The Fast Ratio Pitman & Idler arms by Firm Feel, Inc. are 3/4″ longer then stock.  DIY clearance can be achieved by dimpling the header tube(s), however, doing this modification will void your header and coating warranty.  (This note pertains to 67-76 A-bodies only.  Headers will fit B & E body applications with Quick/Fast Ratio arms.)

AUTO TRANS / STANDARD TRANS with a 10.5″ flywheel (130-tooth ring gear)…

• OEM or Mini starters

• Chrysler part no’s:  R53005984, 56027702AC

• Mopar Performance part no’s:  P5249644AB, P5007860, P4286522

• PowerMaster Performance starter no’s:  9513, 9523

STANDARD TRANS with an 11″ flywheel (143-tooth ring gear)…

• RobbMc Performance starter:  3005

Note:  Mini starters can easily be changed without removing the header.

ALL

SHORT SCREW-ON STYLE OR A 90º ADAPTER CAN BE USED

OEM, MILODON or EQUIVALENT

•  Milodon part no’s:  30935, 30936, 30940, 30941

•  Pro Touring pan part no’s:  31590 & 31595

OEM, CAST ALUMINUM, STAMPED STEEL