MerCruiser 4 Cylinder 153 Exhaust Elbow Riser Replaces B-39920 

Direct replacement exhaust elbow/ riser.

Replaces MerCruiser 55538A2, Osco 5538, Mallory 9-40553 and Sierra 18-1973.

Fits MerCruiser 4 cylinder 153 C.I.D. 120 H.P., Model 120 engine (log style direct replacement).

Barr Marine castings have a thicker interior wall, are painted to match original manufacturer colors and are packed in foam for added protection during shipping and storage. Barr manifolds and exhaust connectors are designed to minimize back pressure, and in many cases more r.p.m.'s are achieved after replacing an OEM manifold with Barr replacement parts.

• Replaces MerCruiser part # B-39920 and # B-55538A2.
• Includes plugs, gasket and mounting hardware to mount to the manifold.
• 3 year limited warranty on Barr exhaust manifolds, risers and exhaust connectors (1 year when used for commercial purposes).

Compatible parts:

• MC-1-63122 direct replacement water cooled exhaust manifold.
• 1-47638 direct replacement exhaust manifold end cap/connector (front).
• 1-47638P exhaust manifold end cap/connector (front) mounting package.
• MC-1-35898P intake manifold mounting package.
• MC-1-63122P exhaust manifold mounting package.
• MC-20-55538P riser to exhaust manifold mounting package.
• MC-29-47587 direct replacement lower thermostat housing.
• MC-29-60372 direct replacement upper thermostat housing.
• MC47-27-35898 direct replacement intake manifold gasket.
• MC47-27-35898A4 exhaust manifold gasket set.
• MC47-27-39915 direct replacement exhaust manifold to exhaust elbow gasket.
• MC47-27-39923 direct replacement exhaust manifold end cap gasket.

Manufactured by Barr Marine. Part number MC-20-55538.