Does anyone know what the studs are made out of and what would be a suitable replacement?

I have some 304 and 316 stainless so I'll probably go for the 304 unless anyone has had a bad experience with stainless.

Cheers All.

Head studs are usually made out of high tensile steel, using stainless is not what I would use, the thread could deform and bind up under torque and could give you grief later on when you are trying to get them off.

I would try and find some proper studs.
That's my 2 cents for today

I can't get any standard ones so this is my best option so far. The 304 stainless is quite hard and not overly brittle. I might just try to torque up some nuts twice the specified tension on the booker rod and see if I can snap it. If it doesn't work I'll have to go shopping again.

Cheers.

P.S. Shear strength of 8mm booker rod is 500 MPA. Any idea what 8.8 or 10.9 is?

I just got new studs for a couple of 21 cylinders from Tyga. Touch base with them.

Not trying to make a sales pitch here, but use the stock stuff.

lol I already did that for you Matt

FWIW, the studs are listed under the MC28 new Honda bits. Just check the stock number to get what you want or ask Matt.

Oh yeah, I picked them up last month so they are in stock.......

C13

I'll be ordering the exhaust stud and nuts from tyga tonight. I hope they can get the parts to me by the time I get my cylinders back( no pressure or anything).

I had a look for the base stud and couldn't find it. So I'll probable just use the stainless. It's only 1 stud and if I had to put my money on either the stainless stud or the aluminum crank case I'd back the 304.

Cheers All