Omc 2.7 mods

[faztbullet]

I am thinking of modding a 2.7 block and have a some questions. I will bore it first from 3.500 to 3.685. Want peak power/torque @ around 8-9000 rpms!!

(1) How big should the oil holes be to cool/lube exhaust bridge?
(2) Should any exhaust port work be done?
(3) Will boost ports like in a Merc work or will sleeves have to be removed and ports cut in and resleeved?
(4) Can the front crankcase be milled?
(5) Should I use the heavy or lite rods?(leaning toward lite)
(6) Should I use cast or forged pistons( ProMarine or Wisco)
(7) Should pistons be top pinned?
(8) Should I go to a custom ignition?
(9) Forget it and buy a race motor??

[gotboostedvr6]

i love omc but your asking too much for a looper to do and be reliable 8-9k rpm is for a 260 + merc

[BenKeith]

Sounds like a job for racer.

With that high of a power band, you can bet a whole lot of port work is gonna need to be done.

Boring to 3.0 will require a relief cut on the bottom of the sleeves.

Heavy rods only for that rpm

Wisco Pistons with the pins top pinned

Forget it and buy a 3.3. You can pick them up cheaper than you can do all the work your' talking about on that 2.7 and they will still make more power.

[faztbullet]

Thanks guys,

[Instigator]

clearly can and has been done but you'll have a bunch of money in machine work to get it there.

start w/a '93 and up block and you get "free" finger ports and it's already bored to 3.0 specs.

way less money for the performance you are after.

7500 and up = mandatory (IMO) big rods and forged (Wiseco's) pistons.