Updated cylinder head studs.

[Joeck]

I am doing a full re build on a 1098 engine and am wondering if uprated cylinder head studs and nuts are worth adding as part of this ?
I understand that the torque settings can be raised using these studs but just wanted to check that the raised torque is not likely to cause any issues.
I have checked all the threads in the block and they are all a good fit to a new standard stud.
Both head and block have checked out good for flatness.
Any advice would be very welcome.
Thanks.
Joe

[philthehill]

My advice is to throw away the standard Minor ex factory cylinder head studs and fit the better 'A' Plus head studs with flanged nuts.
The 'A' Plus studs can be torqued to 50lb f ft dry. I would advise that the revised stud tightening sequence is used. That can be found using the search facility or looking in the Morris Marina workshop manual.
You will not have any problems fitting the 'A' Plus studs and flanged nuts as they are a straight swop.
Make sure that the stud holes in the block are countersunk.
These are the studs I would use:
https://www.minispares.com/c-aht279a-he ... anged-nuts

[Bill_qaz]

viewtopic.php?p=705774&hilit=Head+stud#p705774

Phil the engine guru has posted good info previously as in above link example. You can use the search to find such info.

Phil beat me to it by a minute, a true racer

[Michiel]

Phil, personnally, I would be a bit scared if there is a need to countersunk the block as this would mean the threads are damaged?

[philthehill]

There is absolutely no need to be scared about countersinking the stud holes in the block.
We are not talking about serious countersinking just countersinking enough to remove any existing pull up of the stud threads in the block.
The pull up of threads can cause the cylinder head gasket not to seat around the studs so leading to head gasket failure.
Countersinking the stud holes is a common and well practiced process.