Technical Information :: 6655S Tri-Y Headers


JBA Equipped - ‘69 Mustang Mach I
428CJ Drag Pack

 


*actual product may differ from product shown

JBA p/n 6655S headers are designed to fit ‘67 - ‘70 390/427/428/428CJ Mustangs equipped with 4 spd manual and C-6 factory transmissions.
(High Rise, Med Rise, Low Rise, CJ and Tunnel Port)

These headers provide significant increases in torque and horsepower throughout the RPM range and allow for maximum ground clearance.

To help make sure you choose the correct headers, h-pipe and exhaust for your Mustang please refer to the chart below. If you still have questions, give us a call.

Note : : 69-70 Mustangs with factory shock tower reinforcment plates may require clearancing. Will not fit GT 390 (14 bolt)

:: P/N 6655S Fitment Guide ::

Specifications: Stainless steel 1-3/4" primary, 2-1/4" secondary, 3" dome collector, 3/8" laser-cut flanges

Engine Cylinder
Head
Block Trans. Trans. X-member Clutch

390/427
428/428CJ

Stock Port
Locations
(8 or 16 bolt)

Stock

4 spd/C6/Auto
(will not work
with T-5)

Stock

Factory
Mechanical
or Hydraulic

Motor Mounts Bell
Housing
Starter
Suspension Steering
H-pipe

Stock or Total Control

Stock or
Scatter Shield

Stock or
mini starter

Reproduction upper A-arm
mounting studs may need to be clearanced.

Rack & Pinion - OK
Total Control Rack
Manual Rack - OK
Factory P/S use 6654P bracket

Use JBA p/n
6655H