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Discussion in 'High Performance Modifications' started by 1980RS, Apr 7, 2021.
Just gave the ARP stud a little test, solid as a rock. Will put the head on after lunch today.
hopefully after you run engine and retorque it .still be ok...thats when mine failed.goodluck olbuddy.
My ARP head studs have the hex key hole in them.
Well here is what happened with the bolt after lunch. I put the head on and torqued it a bit at #25lbs and it held, but when I got to #45lbs it failed, so plan "B" went into action. I got out the tap set and found a 12X 1.75 pitch metric tap and tapped the hole out and it looked good. I heads over to the local Menards and bought a few bolts as the metric stuff is hardened pretty well. Picked out a couple of stainless bolts and came back to test them, fit perfectly. Now on to the other thinks that came up, I did have to drill the head bolt hole slightly (no biggie) and after that I put the head back on and found that the larger head on the bolt required a 19mm socket to fit, but that will not work on the head as you cannot get the socket on, so out came the bolt. I have a Worksharp sanding disc machine and proceeded to grind down all the flats on the bolt head until a 17mm socket fit right. Put the head back on ran all the bolts down snung inc. the new one and so far so good. 1st pass at #25lbs good on all bolts, 2nd pass at #45lbs good on all bolts, 3rd and final pass all went good and I stopped at bolt 14 and here we go. Made the pull and "click" it worked at #65lbs. on all bolts. Now I have to clean up all the tools and junk just to get one stinkin' bolt to work. Hope the other head is a lot less work.
glad it worked out for you.
It’s about time that 12x1.75 tap was put to use!
Hope that bolt holds! <fingers crossed>
Nice work there 1980RS...IIRC only the first 3 threads on a bolt that's actually doing the most clamping force the rest are just sort of along for the ride LOL. SBC's design of 5 bolts clamping down per cylinder and all those 5 bolts reaching all the required torque value...you should be golden, again nice work!
Good to hear you got this fixed up 1980RS, I feel your pain when that sh!t happens.
Sometimes you just have to use the crap tap to get the job done, Terry. LOL.
threaded inserts | McMaster-Carr