RE: IML: Further on the Unleaded gas effects discussion of last month

["Dick Benjamin" <dickb@xxxxxxxxx>]

No, and I'm sorry I didn't take any pictures as they came off.  I can tell
you that there wasn't much visible damage - all I noticed was that the 2
cylinders that had shown somewhat low in the compression test also showed
that their exhaust valves had been running hotter than the rest of the
cylinders. This was indicated by the whiter, bleached out look of the carbon
buildup on those two exhaust valves.   When I took the two suspect valves
out of the heads for a visual inspection, I could see some ridge in the
seats of the valves, showing that the valves had sunk into the heads perhaps
0.010" or so, but I did not measure the ridge.  There was also some erosion
of the seating surfaces - very minor but visible with a strong magnifying
glass.  This latter defect was what ultimately caused the valves to leak,
I'm sure.  I decided to replace ALL the valves (this car has almost 130,000
miles on it) and the timing chain and gears, and have the heads updated with
hard seats.

Dick Benjamin


-----Original Message-----
From: mailing-list-owner@xxxxxxxxxxxxxxxx
[mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of Ken Lang
Sent: Monday, December 12, 2005 5:56 AM
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: RE: IML: Further on the Unleaded gas effects discussion of last
month

Dick,

Those nice clean and shiny heads look great.  Did you happen to get a few
shots just as you removed them to show the damage?  If so, those would be
great to see as well.

Ken
67 Crown 4 drht


-----Original Message-----
From: mailing-list-owner@xxxxxxxxxxxxxxxx
[mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of Dick Benjamin
Sent: Sunday, December 11, 2005 9:34 PM
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: IML: Further on the Unleaded gas effects discussion of last month

A couple of people asked about valve seat modifications to combat valve
recession.   Here are a couple of pictures of the heads for my 68 after
inserting the hardened valve seats in the exhaust valves.  All the valves
are new and shiny here, so the seats are a little hard to see, but if you
look closely at the exhaust valves (the smaller valves), you'll see a bright
ring around them; these are the inserts.

I apologize for the black paint - I promise I will paint them the right
color before I install them!

Dick Benjamin

Http://users.sdccu.net/dickb/68heads1.jpg

Http://users.sdccu.net/dickb/68heads2.jpg



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