1973-1977 A-Body LS Exhaust Accessories

Small parts that tie the exhaust together on a 1973-1977 A-Body LS swap, from the Chevelle and Monte Carlo to the Cutlass, Regal and El Camino: stainless band clamps in 2-1/2 and 3 inch, a 3 to 2-1/2 inch cone reducer pair, a 3 inch clamp with a built-in O2 sensor port, and stainless steel header bolts.

Clamps in 2-1/2 and 3 inch
Reducer pair, 3 to 2-1/2 inch
Stainless steel header bolts

Mid-length and long tube headers for these cars, plus mounts and the crossmember, are on the 1973-1977 A-Body LS swap page. Every exhaust part BRP sells is under exhaust components.

1973-1977 A-Body LS exhaust accessories

Clamps and reducers for the A-Body pipes

O2 port clamp and header bolts

Pick the A-Body part by job

Two 2-1/2 inch pipes meet: the 2-1/2 inch stainless band clamp
Two 3 inch pipes meet: the 3 inch stainless band clamp
A 3 inch collector feeds 2-1/2 inch tubing: the cone reducer pair
An O2 sensor needs a home on 3 inch pipe: the 3 inch O2 clamp

1973-1977 A-Body header notes

BRP headers for this body are built around a floor shifter linkage. A column shift car needs linkage changes or a cable shifter.
Plan for the starter, valve covers or spark plugs to come out on some cars while the headers go in.
High-mount A/C and alternator brackets are needed to clear the frame, which keeps the front of the engine clear of the header tubes.
The guide says 4L60E to 4L80E four speed automatics fit the stock tunnel, while a T56, TR6060, 6L80E, 6L90E or 8L90E needs tunnel work.

Notes from the 1973-1977 A-Body LS install guide. Part sizes come from the product names.

1973-1977 A-Body LS exhaust FAQ

Where are the headers for a 1973-1977 Chevelle or Cutlass LS swap?

BRP lists 1-7/8 inch mid-length and long tube headers for this body on the 1973-1977 A-Body LS page. This subcategory holds the clamps, reducers and bolts used with them.

Will the headers work with a column shift Monte Carlo or El Camino?

Not as is. The guide says the headers are designed around a floor shifter linkage, so a column shift car needs linkage modifications or a cable actuated linkage.

Do I have to pull anything off the engine to install headers on a 73-77 A-Body?

Sometimes. The guide says the starter, valve covers and/or spark plugs may need to come off for header installation.

Which clamp should I order to add an O2 sensor on 3 inch pipe?

The 3 inch O2 sensor band clamp. It joins the pipe and gives the sensor a port in one part.