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					Originally Posted by 69L78  I have a pair of 67 heads dated Aug 7 & Aug 24th, the 24th dated head is drilled for the temp sender in the head and the Aug 7 head is not drilled. | 
	
 When the 840 cyl head was first introduced late in the '67 model year there was a short period that the temp sender boss was not drilled and tapped.