not sure on price but to up the power is it just a carb change and possibly reeds? or much more involved. would be a sleeper if easy to modify

Merc's were marked 1150's... Mariners were marked 115's. I've had both a 90hp and a 115 hp and both engines purred. (I still have the 115) They have a dinstinctive sound, and as I've said before they have awesome torque at the prop.

And for those that don't know, they have no separate head. The head is part of the block. It's all one piece. If you have to service the pistons or rods it's thru the bottom. Wierd, but very efficient and weight saving.

I believe they made a 150 tower of power early on back before the V-6's came out. And being an inline 6 crossflow, they are very torquey. Haven't really messed with them much, but I know they are light and there only real downfall was they don't rev out that high.

there is pretty much nothing you can do cheaply to up the power on these... in fact you actually have to detune em a little if you want em to last... they were built for way better gas than we have today so factory spec timing is a little too aggressive for today's fuel.

they are still fine engines but you can't just swap a few parts to make more power..... ALSO parts are NOT easy to come by and many parts just aren't available for em anymore.

will one push a v20 lightly loaded?

that's what I have on mine.... haven't tested top speed yet but jumps on plane almost instantly

Remember these are rated at the powerhead, in 1985 the hp ratings were at the prop, about a 15% hp difference.

The towers of power came out in 90-115-125-135-140-150. They are great motors and not bad on fuel either. Making a lower hp model a higher hp model is tough, differences in carbs, intake, porting and exhaust. These can be found fairly easily, I know 2 guys that have about 20 top's around there shops.

They run crazy good, mass quantities of torque out of the hole!!!

A single 140 or 150 would work good on a V -20. But a pair of 150's would be crazy SWEET!!!:hide: