Jerry San Diego
Seaman Apprentice
- Joined
- Jul 18, 2003
- Messages
- 48
I have a 3.0L OMC 1989 140 hp 181CID. I have had to replace the cylinder head due to a hole in the #4 cyl which allowed water to get in the head. . I could not find a new head with the same casting # as the old one. I bought a used head and took it to a machine shop had it checked and installed it. Engine seems to run good now. Question is: The new head is different from the old one in that the intake exhaust ports are smaller than the new head. The Old head had much larger ports and were the same size as the manifold intake and exhaust ports. The new head has smaller ports, much smaller than the intake exhaust ports on the manifold. I used the gasket for the larger ports. The boat shop I purchased the head from states the smaller port head will operate well with the larger port maniflod and will not cause any problems. He stated the new head with the smaller ports is a better head. My question is : Does anyone know if this mismatch will cause me any problems.<br />Thanks<br />Jerry