I very much imagine is has been skimmed as it has had a lot of work over the years. However, a normal stud set doesnt have any threads sticking out!
Do you know if the block has ever been skimmed? That would seem to be the logical explanation.
Arp Head Studs- Longer Thread Than Std Studs
Posted 29 December 2017 - 02:43 PM
Posted 29 December 2017 - 02:47 PM
But they probably don't go right to the bottom of the thread holes either .. the originals look a few mm shorter in you pic which is still short enough with a chunk off the block.
Posted 30 December 2017 - 11:23 AM
my block was skimmed and I fitted a set of ARP studs but didn't have any threads sticking out. They threaded right down to the bottom, easy peasy.
Posted 30 December 2017 - 06:00 PM
Posted 30 December 2017 - 06:29 PM
I'd measure with a vernier and compare it to how far the stud is going down. I still reckon the threads are corroded down the bottom and need clearing with a plug tap rather than just a thread cleaner.
Posted 31 December 2017 - 01:59 PM
Surely as long as the threads go in as far as the original ones did the studs will do the same job and it's just the look of it that offends? The only issue would be if it lead to a clearance problem at the top. As the studs are only hand tightened it's not as though the friction of the wider part of the stud at the top of the thread against the block is critical?
Posted 31 December 2017 - 06:15 PM
Advice from ARP on this;-
Posted 31 December 2017 - 07:37 PM
Posted 31 December 2017 - 09:20 PM
Posted 31 December 2017 - 10:53 PM
Is there any problem with cutting them down to the same length as the original studs? as they screwed all the way in.
Posted 01 January 2018 - 03:45 PM
I think you might find that the original studs didn't so much screw "all the way in" as much as that they "went in as far as they would go". Break out the measuring sticks (i.e. vernier calipers) and measure the depth of the hole, it will tell you much more.
You could cut the threads shorter but I would advise against it. For one they're tough as old boots and most of all it won't fix the root cause of your problem. Get it measured and see what's going on down there. I'm confident you could run a decent tap down it, clean it out properly and then fit the studs as they're meant to be fitted.
Posted 01 January 2018 - 07:50 PM
I can't see anywhere on the thread if you've measured the depth of the hole in the block compared to the length of the thread on the stud, also, is the problem the same with all the stud holes?
Posted 03 January 2018 - 01:11 PM
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