25 OMC Mods

**88workcar** · 08-05-2009

I just got my hands on a 25 OMC. What can be done. I know that their are some of you here that don't "LIKE" to give away all the secrets, but come on now guys, someone has to carry on when you guys give it up. Yall can PM me with what don't need to be put out thier for general population.

This will be a pump gas motor, short shaft, factory lower with low water pickup. It needs to last for a little while. And needs to stay somewhat on the quiet side. Other than that no rules.

These are my plans, correct me or enlighten me, or just add to it.
1. big carb
2. fiber reeds, cut cage
3. port job, finger ports
4. polished exhast, port tuner or mod it, leave bottom closed
5. lighten rods, pistons, flywheel.
6. balance all parts
7. tune timing and jets.

Thanks for any input.

**88workcar** · 08-05-2009

Oh yes, it will all be 35 stuff to start out with.

**Powerabout** · 08-05-2009

find some new, old style high ring pistons.
Great for any crossflow

**88workcar** · 08-06-2009

can I swap from cross flow set up to a loop charged? or does the porting clash? Any one make heads or pistons for it? What about tuner specs with out going to the megaphone set up?

**Amod20HRacer** · 08-06-2009

Are you planning on racing it or just running it for fun? If you plan on racing it, sanctioning body rules regulate what you can and can't do to the engine. There's not a whole lot you can do to them if you plan on racing it.

Austin Duggan, 78M