CC heads

[fnshrmaster]

How much performance gain can be expected by having your heads milled to raise compression to around 145.I have a 1992 merc efi Xri.Looking for more power!

[fnshrmaster]

How much performance gain can be expected by having your heads milled to raise compression to around 145.I have a 1992 merc efi Xri.Looking for more power!

[175checkmate]

You will see a bit of improvement. If used in conjuntion with other mods, let a bit more.
You will have to use the highest octain gas you can find. I have thought about getting some differant heads for my 2.4L just have not found any yet.

[boatn70]

ive got a set i had hydrodynamics mill to 34cc for my 200 2.4, that with reeds, no oil inject., bobs tuner, ventilate the cowl picked up3-5 mph. went back to stock now boat runs 66-67gps, prior it would run 71-73gps. im selling my heads, the two piece style. ill take 80bucks.

[fnshrmaster]

2.5 is my motor.The 2.4s wont work will they?

[175checkmate]

I wonder what the differance there would be going from the one piece heads that I have to the 2 piece heads?
Not sure what the stock cc is of the one piece heads.