MerCruiser 3.0L Exhaust Manifold Stud 3/8 x 5-3/8 

Replacement 3/8" X 5 3/8" stud.

Fits MerCruiser 4 cylinder 181 C.I.D. 140 H.P. 3.0L and 3.0LX, all models 1990 and up with Vortec style head (log style direct replacement).

Compatible parts:

• MC-1-860235 direct replacement exhaust manifold.
• MC-20-12076 direct replacement exhaust riser.

Manufactured by Barr Marine. Part number MC-50-10-806300.