SST120 heads on 2.0 V6 project

[RoyE]

Hi all, I have the opportunity to buy a set of heads that are described as SST120 heads that are machined to 26 cc

I have two questions.

1. Will this result in too much compression on my project powerhead ? It is a 1988 2.0L 135 powerhead, I already have a horizontal front and a set of WH22 carbs for it. I measured the port heights and they were at 1.61-1.62, I was planning on leaving the porting alone for now.

2. Do the heads look ok? (see pictures) Why would there be circle-like marks in the chambers?

Thanks in advance.

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[Capt.Insane-o]

With the low porting it is going to be up there, what fuels do you have readily availiable?

[RoyE]

We have 98 RON readily available here (Netherlands), which is similar to 93 in the USA I believe.

[Merc 2.5]

Maybe Capt will respond to this again also but I'm not sure that gonna b enuff octane, the heads have been worked, mite have had sum peppering and was fixed, no biggie there , but if ur over 150lbs better start lookin for av fuel b my guess,

[Capt.Insane-o]

1.545 is the spec for 120 you will probably end up a bit over 160 psi with the fishing motor port height. If the owner will let you bolt one to the motor to check that would be to your benefit.

[RoyE]

Thanks for the advice, I will skip this for now and probably cut my current heads to about 28cc when I'm ready. I cannot bolt them to the motor as it is currently disassembled. I will probably make a new topic for the rebuild when my boat is ready, it will be my first rebuild/modifying of a motor, which is why I first want to leave porting alone.