G3GM
Would you like to react to this message? Create an account in a few clicks or log in to continue.

G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


OMC Marine 305 - worth buying?

4 posters

G3GM :: G3 Tech :: Engine & Driveline

Go down

OMC Marine 305 - worth buying? Empty OMC Marine 305 - worth buying?

Post by 76 Malibu Fri Nov 06, 2020 5:46 pm

I found this 1977 OMC 230 305 V8 for sale for cheap.  It supposedly runs.  Anyone know anything about this engines?

My 350 needs valve seals and possibly guides.  So instead of rebuilding the heads, I was thinking of upgrading them to something with a smaller chamber to bump the compression.  Anyone have any idea what heads this 305 would have? Would the heads from this 305 be a worthwhile upgrade for my otherwise stock '76 350?  Eventually I will build an engine for the car, but for now it'd be nice to get a bit more performance from it. If I did use it for heads, I'd strip it and part it out. I am sure some of the marine specific parts should sell.

So is it a worthwhile buy?

OMC Marine 305 - worth buying? Omc_2310
76 Malibu
76 Malibu
G3GM Member
G3GM Member

Street Cred : 2

Back to top Go down

OMC Marine 305 - worth buying? Empty Re: OMC Marine 305 - worth buying?

Post by Limey SE Fri Nov 06, 2020 7:14 pm

Ask them to take a Valve cover off to give the heads casting NUMBER BUT ALL in all the Monte SS from 84 and similar would be better to use

___________________________________________
1977 Chevelle SE x2
One Mild original
one Wild NON original
Anthony
Limey SE
Limey SE
Management
Management

Street Cred : 98

Back to top Go down

OMC Marine 305 - worth buying? Empty Re: OMC Marine 305 - worth buying?

Post by bracketchev1221 Sat Nov 07, 2020 6:38 pm

If its raw water cooled engine then walk away.  The water passages are all corroded. And from the looks of the water neck and water pump hose connections it was.
bracketchev1221
bracketchev1221
G3GM Enthusiast
G3GM Enthusiast

Street Cred : 16

Back to top Go down

OMC Marine 305 - worth buying? Empty Re: OMC Marine 305 - worth buying?

Post by 76 Malibu Sun Nov 08, 2020 8:04 pm

Good call on the fresh water thing. I asked him for the casting number for the heads but he sent me the block number which is 460777. The suffix code shows T08089MJ. I think I am going to pass on this one. I was just looking to do a simple head upgrade on the cheap.

Monte SS heads would be good, they just don't ever turn up around here.
76 Malibu
76 Malibu
G3GM Member
G3GM Member

Street Cred : 2

Back to top Go down

OMC Marine 305 - worth buying? Empty Re: OMC Marine 305 - worth buying?

Post by bracketchev1221 Sun Nov 08, 2020 10:08 pm

Other than having to get a new intake look for a set of vortec heads. They seem to be the hot thing.
bracketchev1221
bracketchev1221
G3GM Enthusiast
G3GM Enthusiast

Street Cred : 16

Back to top Go down

OMC Marine 305 - worth buying? Empty Re: OMC Marine 305 - worth buying?

Post by jerry46765 Sun Nov 08, 2020 11:22 pm

Unless you get the engine for free, it's used up. Boats are hard on engines. I could go on but in summary if you are on a budget, walk away.
jerry46765
jerry46765
Donating Member
Donating Member

Street Cred : 20

Back to top Go down

OMC Marine 305 - worth buying? Empty Re: OMC Marine 305 - worth buying?

Post by Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

G3GM :: G3 Tech :: Engine & Driveline

 
Permissions in this forum:
You cannot reply to topics in this forum