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Northstar head bolts on a lathe


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I was made in Dallas,68 year’s ago, I’ve been a mechanic all my life, and have a 2002 Deville w/4.6L Northstar engine, it has a compression leak in the coolant/ head gasket leaking. I’ve decided to stud the block 5/8”x11. I bought 7”long grade 8 CAT BOLTS and cut the hex heads off, then turned them down on a lathe, from the 5/8x11 threads to reduce the shoulder to a 1/2”. My question is: wii the heads bolt holes allow a 1/2” diameter stud, or do I need to keep on machining down to 7/16”. If you know I’ll be waiting for an answer, and very appreciative of your knowledge. Thanks 

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Hi Dave, Welcome to CaddyInfo.   Have you look at what Jake is doing at http://www.northstarperformance.com/sgstuds.php ?

The standard headbolts are either M11x1.5 or M11x2 depending on year, so the 'hole' is for an M11 bolt with either 1.5 or 2 pitch threads depending on year.  The M11 bolt is 11mm diameter, (0.433071"), or around 7/16 inches (0.4375").  Ref

Bruce

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