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How can i get more power on my Merc 57 260Hp 350 CID

"Put in a 454 HO..............

"Put in a 454 HO..................LOL

The difference between a 260 hp and a 350 mag (270-280 hp) is the intake manifold and the flame arrestor.

Knowing this, How much mechanical work can you do and how much are you willing to spend.

A cam, intake and a recalibrated carb should get you near 300 hp."
 
I have a 85 mercruiser 260hp..

I have a 85 mercruiser 260hp...the carb is original to it and is a quadrajet...

there is a mercruiser metal tag on the carb..that says 260/270.

how can I get the 270 hp or more out of my boat? You're saying buy a magnum flame arrestor?
 
"Builders Basics
porting and

"Builders Basics
porting and polishing,better flowing heads
new cam
"gasket matching" the intakes and exausts
larger bore, longer stroke,bigger valves
The trouble is it all has to GET OUT thru a inefficiant exaust manifold.so unless you plan on running inverted open headers, forget it.
There`s no substitute for cubic inches"
 
"sam,

i have talked with th

"sam,

i have talked with the guys that built my boat and this is what they have told me to do:

1. Vortec heads from a chevy truck
2. edelbrock rpm air gap intake
3. 492 thousandths lift cam
4. valve springs that will accept that cam
5. 1.6 ratio roller rockers

that combo took a concord boat from 56 to 69 at 500 ft above sea level"
 
im going to do the mods to min

im going to do the mods to mine this winter. we will see in the spring what happens
 
"Ayuh,....

With that much L

"Ayuh,....

With that much Lift on the Cam,+ 1.6 rockers,...
The Vortec heads will experince Coil Bind.....

They're limited to about .480 lift, without some Machine work..."
 
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