I know OMC means good luck finding parts but does anyone know where I can find a couple exhaust manifolds for a 1977 351W 235hp? I know somewhat about auto engines but little to nothing about marine engines & where to buy parts.
Check with your local NAPA store. The starboard manifold number is (I think) 0909215 and the port is 0909216. They're NLA, but NAPA may be able to cross reference for you.
basically if you are looking for new manifolds you will have to convert to center risers . other than that your only options are the log or banana style manifolds , but those havent been made in ages
basically if you are looking for new manifolds you will have to convert to center risers . other than that your only options are the log or banana style manifolds , but those havent been made in ages
basically if you are looking for new manifolds you will have to convert to center risers . other than that your only options are the log or banana style manifolds , but those havent been made in ages
Have any of you done the conversion to center risers? I am mechanically inclined but is it a major PITA? For $875 the whole conversion kit looks promising but am worried fitmit might be different from boat to boat. I don't want to be re-ordering several times to get the correct elbows & tubes to make it fit properly.
was worried about that too , but dont stress over it . The 90 degree elbow and 2 hoses fit in there pretty dang straight with no bends , you just have to eyeball and put the 90 in the right spot = then its a straight shot down to the intermediate .
and like I put in my thread , use softwall hose not hardwall. There is no need for hardwall hose there as there is no major bends.
Yup do it ! I used the risers labeled #14 in that parts list , you can use the # 12 risers , but you will need different elbows since those are different outlet size.
I purchased this manifold kit & am getting ready to mount them & noticed they only have 4 mounting bolts to the heads not 8. Is this correct for this conversion? It's Sierra center riser conversion kit #18-1998-K5 & installing them on a 1977 351W OMC.
Wow! I wouldn't think you would get a good seal & would leave more room for warping down the road. Haven't put a straight edge on it yet. If it is slightly off can a guy hit it with a sanding block?
Yes got it off ebay. A little more than $800. Could have got other kits for a little less but they were the brands Bondo was talking about so I went with Sierra.
& noticed they only have 4 mounting bolts to the heads not 8. Is this correct for this conversion?
Wow! I wouldn't think you would get a good seal & would leave more room for warping down the road.
It's a massive castin', 4 bolts hold it plenty tight,....
It's plenty rigid, 'n marine manifolds don't glow red, so warpage is pretty much unheard of,....
