<VV> Overheating - Deflashing Heads

Louis Armer carmerjr at mindspring.com
Mon Jul 26 16:33:27 EDT 2010

Hi Bill, If you have never deflashed Corvair heads then DON'T use the 
drill as one mistake can cause you to damage the head you are trying 
to improve. Use an old fashioned hack saw blade.........buy several 
at least 12" long and wrap one end with electrical or duct tape to 
form a protective handle. On the other end shape the saw blade end 
into a fairly sharp angled pointed end. Now you have a reliable 
inexpensive flash removing tool. You will need to work from top and 
bottom to achieve the best flash removal. While you have the shrouds 
removed check your oil cooler for trash and dirt. Patience is a 
virtue in flash removal so take your time and the results will be 
rewarding and remarkable in lowering the head temps. 69 heads had a 
lot of flash in most cases as the dies/molds were getting old and 
excessive flash is not unusual and dramatically restricts air flow.

Chuck Armer

At 04:18 PM 7/26/2010, you wrote:
>                                                       B"H
>Hi all...since I installed A/C in my Corvair it's been nothing but trials and
>tribulations!  Last week, maiden voyage past my 4 mile commute to/from work,
>temp outside was around 95 degrees and we got stuck on the FDR Drive in NYC,
>bumper to bumper for over an hour in the hot sun.  I had to go 
>upstate to answer
>a traffic ticket.
>The oil temp gauge kept getting hotter and hotter, got past 260 
>degrees and onto
>340, no place to pull over.
>I shut the A/C off before that point.  However, as we idled our way 
>up the east
>side of Manhattan, the TEMP/PRESS light came on, and I gingered the 
>car as best
>I could till we could pull over (there's no place to pull over until 
>you cross
>the George Washington bridge and get onto the New Jersey side of the 
>She was pinging loudly too, but as soon as we crossed the state line 
>we stopped
>at a rest area and I let her cool off for a few minutes, and the sun 
>went behind
>the clouds.
>The temp went down to around 260, we got back on the highway but now 
>there was
>no traffic, so she stayed just under 260, I turned the A/C back on 
>and there was
>no pinging, nor did the TEMP/PRESS light come back on either.
>Coming back, it was raining, hail, thunder/lightening, etc. but she 
>ran ok.  In
>fact, the A/C was a godsend because at least the interior was cool and
>As soon as we got back into Brooklyn, hot weather and idle, idle, 
>and idled our
>way home.  Temp went back up, TEMP/PRESS light back on, pinging, etc. even
>though the gauge indicated 250 degrees for the oil.
>It hit me that not de-flashing my cylinder heads was a B-I-G mistake, and I
>better do this before I take the car out again on a trip.  She still 
>runs and I
>pray to the Al-mighty that I didn't damage her engine permanently.
>So, does anyone have suggestions for the best (and least intrusive) way to
>deflash the heads?  I don't mind removing the top shrouds if it 
>doesn't take all
>day to do, and if it makes de-flashing easier.  Can de-flashing be 
>done from the
>top of the engine instead of getting under the car.
>I've heard that a long 1/8" drill bit is the best way to go.  If 
>that's so, then
>I assume that this size bit will fit in between the fins?
>I'd appreciate any and all suggestions and thanks...Bill Hershkowitz 69 Monza
>110 PG
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