[Supras] valley plug removal

[Bob Shapton]

If the head is off the engine, and IF there is still a way to get a grip on the plug, you can try 
this: Heat the head in an oven, (dunno where you get an oven big enough) getting it as hot 
as you can without exceeding the normal operating temp of the motor - boiling point of 
water. Then using a cold tool try to remove the lug. If you have access to dry ice you could 
give the plug a shot of that just prior to removal attempt. The idea is to increase the 
diameter of the hole by heating and then shrink the plug away from the hole. Failing that 
take it to a machine shop that specializes in aluminum heads.

Bob

> Dear Rocky:
> 
>     I finally got around to really trying to remove the plugs with a
> punch and hammer as you suggested.  These plugs must really be tough
> as I have a crater at 45 degrees to the head plane in one plug
> formed by really laying into it with a pointed punch and a 3 #
> hammer.  After smoothing the top with a grinder, I guess I'll go
> back to my silicone rubber gasket approach, with 5/16-18 bolts to
> hold thick 50 durometer silicone down fender washers abd bolts in
> the center of the plug hexes.
> 
>     These plugs absolutely refuse to move.  I rounded out the hexes
> wiith a 3/4" impact wrench.  You were probably lucky.  I soaked the
> plugs in penetrating oil for a week first.
> 
>     Any and all comments would be appreciated.  These are JDM heads,
> 
>         Bernie
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