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Hmm, I found this hole in the combustion chamber when taking apart a customer's 2.5. My father says it's a casting irregularity which is probably true. The hole is about dead center in the photo below.

I am a little concerned because this hole is about 2mm deep! What do you guys think? Should it be ground out and filled in somehow? If left as is will those sharp edges promote detonation?

This is a low mileage motor with a colorful history.

Greg Gordon

Probably casting stuff, ejection pin or something.

a poor casting...or someone lost a screw...

Mats..I would put fill branches (cut off pins}or eject at a place where you are going to drill out for some kind of plug or something..chamber dome is odd place..

you can have theis welded in by a "competent" aluminum welder

I have seen many racing heads re-welded and ground and they turn out fine....

Hi Greg...Yes,Id also fill it in..
Id use a pin punch and a slug of some ally and fill up that hole.
Once you have knocked it in with the punch,it going no where..

Thanks guys,
We are going to fill it in.

Greg

being that there are fewer and fewer heads...sounds like a good idea

Exactly, this is a minor problem and it´s not worth throwing away an otherwise perfectly good head. I am sensitive to the decreasing number of good cores.