Re: Distorted/leaking thermostat covers

[legendre]

quote Mumbles:

This problem is common with the three bolt cast aluminum housings. Since they can’t be lapped or machined because of a protrusion on them (…)

You can’t even mill them true? How was it done at the factory?

Could someone please provide a photo or drawing of this part, I’m curious what feature prevents a straightforward lapping..?