Posted by casebro on Tuesday, November 06, 2001 at 6:50PM :
In Reply to: 78 powerwagon head question posted by Brad Billings on Tuesday, November 06, 2001 at 1:12PM :
the crescent gaps in the head are to provide insulation between the heat riser port and the 'valve chest' so that you don't get a pile of carbon build up inside the rocker covers. Leaving them open to the outside will prevent the heat from soaking through them.
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