GM small Block V-8 Osco Marine Manifolds
265, 283, 305, 307, 327, 350 and 400 Cu In
Since 1932
OSCO Motors Co. has been in the business of providing boaters with a high quality, reasonable cost alternative to original manufacturer's equipment.
All manifolds come with a 3 year warranty and DO NOT include gaskets. Order gaskets and bolts separately. We stock all OSCO manifolds and ship the same day.
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1.CVCR818 Manifold. Fits 265, 283, 305, 307, 327, 350 and 400 cu.in. GM small block V8 engines. Fits both sides of engine. Use mounting kit CVCR-MK.

2.CVCR-MK Mounting Kit, manifold. Fits CVCR818. Includes CV-GH gasket and mounting hardware.

3.CV-GH Gasket, manifold to cylinder head. Included in CVCR-MK.

4.CRR-1 Riser, 3" exhaust outlet, 10º down angle. Use mounting kit CRR-MK or CRR-MK-FW.

5.CRR-3 Riser, 3" exhaust outlet, 30º down angle. Use mounting kit CRR-MK or CRR-MK-FW.

6.CRR-14S Spacer, 4". Use mounting kit CRR-MK or CRR-MK-FW. Risers will need their own mounting kit.

7.CRR-MK Mounting Kit, risers and spacer. Fits CRR-1 and CRR-3 risers and CRR-14S spacer. For raw water cooled manifolds. Includes CRR-G gasket and mounting hardware.

8.CRR-G Gasket, riser and spacer to manifold. Allows cooling water to pass from manifold to riser or spacer.Included in CRR-MK.

9.CRR-MK-FW Mounting Kit, risers and spacer. Fits CRR-1 and CRR-3 risers and CRR-14S spacer. For closed cooled or recirculated manifolds. Includes CRR-G-FW gasket and mounting hardware.

10.CRR-G-FW Gasket, riser to manifold. Blocks cooling water from passing from manifold to riser or spacer. Included in CRR-MK-FW.

11.CRR-G-SP Stainless Plate. Use with two CRR-G gaskets. Blocks water flow from manifold to riser or spacer.

12.F68C9 Water Fitting, 90º elbow. 3/4" MPT x 1" hose barb. 

13. F68CS Water Fitting, 90º elbow. 3/4" MPT x 1" hose barb. 

14.F66CS Water Fitting, straight. 3/4" MPT x 1" hose barb.

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