1-3/4″ W2 Small Block Step Headers

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

[Check your engine location:  See FN39 for the factory dimensions]

273, 318, 340, 360 A/LA-engines, 402 crate, 408 Magnum crate, Mopar 440 Super Commando crate

W2 Econo 3870810, W2 Race P4532693, Aluminum Magnum P4532900, Large Port Commando P4532795

Note:  Your cylinder head center bolt hole pattern spread must measure 3-15/16″ from the center of the left bolt hole to the center of the right bolt hole for these headers to fit.   [See Bolt-hole measurement for illustration]

STRAIGHT or ANGLED

OEM with torsion bars.

COILOVER without torsion bars (RMS Alterktion, Magnumforce XRT Tubular K-frame or Control Freak)

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

Headers will not clear UniSteer Performance Rack and Pinion.

67-76 A-body applications:  Headers will not clear Firm Feel fast ratio pitman & idler arm.  The Firm Feel arm is 3/4″ longer than the stock arm.  (The OEM arm measures 5-1/4″ from center to center)

OEM

Headers fit with Schumacher Creative Services engine mounts or equivalent.

YES 

Note:  Some applications with a floor shifter may require the adjustable swivel & the lower rod to be re-positioned to clear the header collector.  [See FN23 for illustration]

YES

Note:  Correct installation of the Keisler Tremec TKO-500/600 Transmission 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.

Flywheel:  10.5″ 130-tooth ring gear   …Applications with an 11″ 143-tooth ring gear must use a RobbMc Performance starter:  3005

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

YES

Note:  Some applications with an auto transmission may require the adjustable swivel & the lower rod to be re-positioned to clear the header collector.  [See FN23 for illustration]

YES

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

YES

YES

YES

NO 

Will not clear a factory low-mount air compressor.

DYI alternative for 66-72 B-body & 70-74 E-body applications only:  Make a small indentation in the #1 header tube to clear the factory low-mount A/C compressor.  [See illustration sheet #57MMBE]

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

(!) Applications with an 11″ 143-tooth ring gear must use a RobbMc Performance starter:  3005.

ALL

Short screw-on style, a 90º adapter can also be used

OEM, MILODON & ROAD RACE

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

Road Race pan part no’s:  31595

OEM, Cast Aluminum, Stamped steel