Excuse my lack of knowledge on this, but I cant for the life of me think of an acceptable reason why the valve seat on the guides on my M117.985 would shrink.



Id think brass would not shrink to this degree. I expected to have to order oversize guides as I expected the head ports for the guides to have expanded (as they are aluminum) but once I got the digital caliper out, this is what I found. Any ideas, Im really stumped as to why this would have happened.

__________________
". . .back before accountants designed cars"

-Current Stable-
'78 MB 450SL-C 107.024.12.020783 #3840 <Kayleen>
'85 FORD F250 6.9L Diesel <Allison>
'98 Lexus ES300 <Rachel>
Long Gone...
'74 Chevy G10...........................'99 GMC Yukon 4X4
'83 Chevy Suburban 6.2 diesel .....'99 SAAB 9-5
'90 Mitsubishi Eclipse GS............. '01 Chevy Tahoe
'98 Nissan Altima .......................'02 MB ML320
'88 Chevy Suburban V2500 4X4 6.2 diesel