For a 4 Bolt Main Go Stud or Bolt???

[DaLowRyda]

it sound better for the stud cause it would split the pressures on 2 threads compared to 1...but isnt that just 1 more thing that could come loose and cause a major problem? what does everyone think about this and why it is?

[Matt167]

stud any time you can, and can afford to do so ( in most cases factory grade 8 hardware will do just fine ), they can retain more clamping force.

[R Pope]

The thing about studs is, the threads in the block aren't "pulled" as much, since they are threaded in fully before torquing. Also, the studs are usually fine thread on the top bit, so the clamping force is better than coarse thread and they don't tend to loosen up as easy from vibration or whatever. Another plus is that any fatigue from re-use is mainly in the nuts, and they are easily and cheaply replaced. All that said, they are a pain to work with if you don't really need them.

[techinspector1]

I would have no hesitation using studs on the main caps. I'd have to think twice about it on heads though, because normally the driver's side head can't be removed with the motor in the car due to interference with the master cylinder/booster assembly.

[DaLowRyda]

so stud it is for a high performance application? i will be pushin 475hp.....obviously ARP.

[kitz]

The studs are not twisted like a bolt is, placing it in a combined stress state, that's the real reason studs are better to use structurally. You tend to get a superior clamping result with studs.

Kitz