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1993 Ford Mustang Ford Racing Performance Boss Engine Drilling

The cylinder-head bolt holes needed to be drilled out for the 1/2-inch ARP studs that we'll be using to secure the cylinder heads. A little WD-40 and a sharp bit is all that's needed. Try to keep the drill plumb and level with the bolt holes.
Ford Racing Peformance Parts Boss 302 Engine Build - Reptile Resuscitation

 The cylinder-head bolt holes needed to be drilled out for the 1/2-inch ARP studs that we'll be using to secure the cylinder heads. A little WD-40 and a sharp bit is all that's needed. Try to keep the drill plumb and level with the bolt holes.  View Related Article

 

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