Exhaust Manifold Riser, PCM 3.5 inch outlet for Ford and GM 305/350 (HO and GT40 engines), # R029011
The 3.5 inch exhaust is used on High Output (HO) engines such as all GT-40 engines and engines labeled High Output (HO) from 1991 on.Please verify if you have a 3″ or a 3.5 inch exhaust. Note: the manifolds are the same for either size riser.
The 3.0 inch riser is part no. R029001 and is generally used on PCM manifolds prior to 1991.