I'm going to be installing screw in studs into a set of vortec heads. I have already removed the press in studs and my question is will I have to have the bosses milled to instell the screw in's or can I just tap the holes and install the studs and thats that?

 

Tapping the holes and installing screw-in replacements are nothing but a poor mans stock replacement stud. Proper aftermarket studs need the boss machined down so that they can be installed.

Replacement studs are just a plain stud with threads at each end. They are not designed for spring pressures greater than stock. Aftermarket studs have a base so that you can tighten them down with a socket.

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87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block

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87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

So how do you tighten a "proper" aftermarket main cap stud? What hex collar? You can't fool me. I used to make, test, and qualify fasteners by the trillions, mainly for Ford, GM, and American Honda. The design deosn't really mean squat. Tensile testing and hydrogen embrittlement are the keys, and some of the "high-end" aftermarket bolts and studs fail miserably at standard ISO or ASME materails tests.

I'm only pointing out that you can't always make a generic statement that covers all the bases. Some of the collarless studs are superior in material to the "best" collared studs, if only because of the forging and cold flow stress lines created at the base.

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Later,
Vader
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"Let the bodies hit the floor!"
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