The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - project " Blue-Ray"

68 short step · 08-15-2010, 11:21 PM

drilled and tapped the pass side head to a 1/4"NPT.. there is a plug on the pass side head, near the rear, remove it, then take it up with a 7/16" drill, then tap it to a 1/4" NPT....done it many many times, with no issues

08-15-2010, 11:21 PM	#68
68 short step Senior Member Join Date: Aug 2005 Location: tulsa OK Posts: 3,070	Re: project " Blue-Ray" drilled and tapped the pass side head to a 1/4"NPT.. there is a plug on the pass side head, near the rear, remove it, then take it up with a 7/16" drill, then tap it to a 1/4" NPT....done it many many times, with no issues