Originally Posted by Silver Surfer
Is there any chance that anti corrosion crap will ruin the engine oil?
No, it won't ruin the motor oil/beak in lube.
Unless the backing has peeled away from the gasket core they should be OK to use. If you feel otherwise, obviously you can replace them.
The 4" bore gasket is for a 4" nominal bore
- that's to say the gasket should accept overbores up to at least 0.060". To be sure, simply measure the amount of bore that is showing w/the head gasket in place to be sure the gasket fire ring isn't overhanging the bore. Or measure the gasket bore- it should be around 4.090" to 4.1" for most 4" nominal bore gaskets.
If you look up the specs on the 10105117 gasket, the bore diameter
is 4.1"- at least that's what my hand written notes say...