OMC 351w

[cwd60tx]

I already have a 351w in my boat,its a 1977 Cobalt and the engine is good but this winter in my garage I want to build another 351w.what I want to know is if I get one out of a pickup what do I have to do to convert it to a marine engine do I have do use the old heads and what is the specs on the cam? I want it dependable ,but use a diferrent manifold.This is for fresh water only.I want to bore it out .30 over maybe .40 but I need to know about if I need to use the same headd and what the cam specs or for the marine engine Thanks for any advice

 

[cwd60tx]

Re: OMC 351w

By manifold I mean a intake like a Ederbrock

 

[dakine]

Re: OMC 351w

Use a low overlap marine cam or reversion will pull water back into the exhausts.
Use marine rated electrical and fuel components(ignition, alternator, pumps and carb)
Wrench away, there is nothing magic about boat applications.

 

[Aloysius]

Re: OMC 351w

Having just rebuilt 2 "marine" 302's (351's without steroids) I'll attest to the fact that they are BONE STOCK production engines with "marine" cams. No windage tray, stock silent chain cam drive. Did have the good roller fuel pump eccentric, and a cast iron timing chain cover.

The "marine" cam is probably 206/221 @0.050, 116/113 lobe centers. 114.5 I/E spread.

 

[cwd60tx]

Re: OMC 351w

thanks for the replies that what I wanted to know

 

[zbnutcase]

Re: OMC 351w

Having just rebuilt 2 "marine" 302's (351's without steroids) I'll attest to the fact that they are BONE STOCK production engines with "marine" cams. No windage tray, stock silent chain cam drive. Did have the good roller fuel pump eccentric, and a cast iron timing chain cover.

The "marine" cam is probably 206/221 @0.050, 116/113 lobe centers. 114.5 I/E spread.

The ONLY small block Ford to have a windage tray was the Boss 302, and quite a few pre '77 marine 302's came with 351W heads from the factory,something NO automotive engines ever did