alpa a écrit :I did not get answer from Regina, not surprising, Maseralfa explained in Italy you have to call before writting to them
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He'll try as a professional, he owns a parts business.
Oh, great. I've heard the same, and of course you have to speak Italian
alpa a écrit :
Your head looks like having had strong ping, ping melts down the surface. But it usually happens on pistons, not on the head. At least I have not seen such case but I don't have so much experience with this. Check piston crown when it's in TDC. These heads are extremely well designed so they are very well cooled. And pistons are forged. So it may be OK after some cleaning and surfacing.
I've checked the piston, haven't noticed anything, but it's covered in crud, might be that it has a small missing piece? Will try to clean it and check again.
alpa a écrit :
Valves are OK and yes they are close to the surface but this is how F1 heads are
. It's written Coscast, not a mistake, it's Cosworth.
Head oxydation is not unusual on old engines. You'll see more once surfaced, removing 0.1mm may suffice.
Does this oxidation that mean that gaskets are not designed for such a long time? Or improper coolant? Or if the car is running rare the corrosion inhibitors are not flowed properly through the engine? I'm just guessing here.
Valves seemed to me so close the the surface that removing any material will cause cutting into the seat, but I've never seen similar heads. Neither F1 heads
alpa a écrit :
Note that valve seats are very special (round shaped like on F1 engines, not angled) so don't allow any wanker to work on them. There is only one angle on them.
So it's not simply the traditional 45 degrees cut as the manual writes for recentering the seats when changing guides?
Froggie a écrit :Did you have a corresponding gasket deterioration and possible water pathway in the shown circled zones where the head was pitted?
The imperfections of the casting may also be responsible for preferred water pathways and localised corrosion.
As alpa says, sanding the surface a few ten thous may do it and close the paths
Yes, the pittings are at the worst gasket deterioration areas where the coolant seeped through (slightly visible on the first picture).