ARP HEAD STUDS - WE HAVE BEEN A WD FOR ARP SINCE 1985. WE HAD THEM MAKE STUD KITS FOR THE 5. 7, 6. 2, 6. 5 AND 7. 3 DIESELS BACK IN THE DAY. WE APPROACHED THEM IN MARCH OF 2000 AND GAVE THEM DRAWINGS FOR THE 5. 9, AFTER MANY MONTHS OF CALLING AND FAXING THEM THEY FINALLY GAVE US A QUOTE OF $826/SET. WE THOUGHT THERE MUST OF BEEN A MISTAKE, SO WE ASKED... THEY SAID THERE WOULD BE A SET UP FEE FOR EACH STUD. I ASKED THEM IF WE PUT TOGETHER AN ORDER FOR 100 SETS WOULD THEY RECONSIDER THE PRICE. THE SAID "NO!"
OUR CUSTOMER WAS WILLING TO PAY THE PRICE, SO WE ASKED THEM TO GO AHEAD AND BUILD THEM. AFTER ED'S TRUCK SITTING HERE FOR OVER 6 MONTHS, NUMEROUS PHONE CALLS AND BEING TOLD WE'RE GOING TO GET TO THEM... BLAH BLAH BLAH, WE WENT IN SEARCH OF ANOTHER VENDOR AND FOUND A-1 TECHNOLOGIES. THEY WERE WILLING TO WORK WITH US. WE DID SOME CHECKING ON THEM. THEY BUILD STUDS FOR MANY TOP FUEL AND NASCAR TEAMS SUCH AS RCR, HENDRICKS AND DEI.
A REPRESENTATIVE FROM ARP CALLED SOMETIME A COUPLE OF YEARS AGO INQUIRING ABOUT OUR PURCHASES, WHY JUST NUTS AND WASHERS AND NO STUDS? I ASKED IF HE REALLY CARED OR IF THIS WAS JUST A ROUTINE CALL TO EVERYONE. HE SAID HE CARED AND I FILLED HIM IN. HE ASKED FOR ANOTHER CHANCE, WOULD I FAX THE DRAWINGS, HE GAVE THE PERSON FOR WHOM TO DIRECT THE QUOTE TO. I FAXED THE DRAWINGS, 2 YEARS LATER AND WE STILL HAVEN'T HEARD BACK FROM THEM.
MY OPINION IS THEY DIDN'T WANT IN AT THE START, NOW THAT WE'VE PROVEN IT TO BE EFFECTIVE, THEY WANT IN.
WHILE TESTING, WE TRIED 12MM 220KSI AND FOUND IT NOT EFFECTIVE ON THE 12V. OUR CONCERN WITH 12MM 220 IS THE THREAD STRENGTH OF THE BLOCK.
FOR THOSE WHO BUY OUR KITS, WE USE ARP 12PT NUTS, HARDENED WASHERS AND ARP MOLY LUBE. THE STUDS ARE MADE BY A-1.
FOLLOWING IS THE INFORMATION FROM F-1 REGARDING THE ARP STUDS. I FORWARDED THIS TO MR. DON TRAPP AT A-1, HE HAS INSERTED HIS COMMENTS ( ):
REBUTTAL TO ARP/FORMULA 1 DIESEL AD
These are the "real (copy) deal" in high performance head and main stud kits! Automotive Racing Products manufactured these studs for F1Diesel using the finest material, (what is their material? A1 uses 4340 or 8740 and H-11) rolled threads (A1 always rolls threads and always after heat treatment), and controlled heat treatment. When others will fail, the ARP fasteners will not. The studs are 12mm and do not require any machine work to the block or head. F1Diesel can broach an allen head socket into the studs using EDM (EDM must be expensive) for ease of removal and installation as well. (If the internal hex into the top end of the stud would make life easier, we can do that before heat treatment with a broaching machine. This would add about $1. 00 per stud but may be a nice feature for selling. It can be done to both the alloy studs and H-11. )
Full engagement of threads reduces stress concentrations at the root radius of the last thread. (This is why we manufacture the studs with a dog point, as it bottoms out in the block thereby distributing the load more evenly across all threads in the block. Not commonly done by ARP unless they are battling to copy A1. ) Shot-peening sets up a compressive stress on the surface that helps prevent cracking. (The shot-peening statement is correct regarding its effect, but absolutely unnecessary for this application. It is more commonly used in fatigue applications such as rod bolts. The most probably reason for ARP to use it in this application is to hide tooling marks from manufacturing. ) Perhaps the most critical process is thread rolling after heat-treatment—which accounts for a fatigue strength approximately ten times greater than those fasteners threaded prior to heat-treat. (This is true and as stated before A1 always and only rolls threads after heat treatment. ) Careful attention to the shape of the thread root radius and its blending with the flanks is crucial. All ARP® threads are rolled in accordance with MIL-S-8879 (This spec is as old as the hills and A1 as well as any respectable fastener manufacturer rolls threads in accordance to this spec. (the well-known fatigue resistant J-form thread). (A1 also rolls all of our threads to the J form, always has, which has a larger root radius, better for strength and fatigue properties. ) This ensures that notch sensitivity of the root section of the thread is reduced to the Mil-Spec minimum.
Ask others who sell studs if their stud threads are cut after heat treatment or before. (Any cut thread is a disaster waiting to happen, before or after heat-treat. ) It makes a difference in quality!! So far every aftermarket Cummins supplier we asked did not even know it made a difference. (Wonder if they actually really bothered to ask anyone, most likely not. )
Ask others if theirs are shot peened. Again, this is an art and not many shops can do or do it correctly. All ARP® stud kits include premium quality parallel ground washers and a choice of 12-point or hex-head nuts.
I WILL POST THIS ON OUR WEBSITE TO THAT IT MIGHT BE A BIT EASIER TO READ.
www.HAISLEYMACHINE.COM
THANK YOU FOR YOUR PATRONAGE AND SUPPORT. WE WORK VERY HARD TO PROVIDE QUALITY PRODUCTS, SERVICE AND TECH SUPPORT FOR THE PRODUCTS WE SELL.
WE ARE ALWAYS HAPPY TO DISCUSS AND WORK WITH CUSTOMERS ON THEIR PERFORMANCE NEEDS AND PROBLEMS AND HELP PROVIDE THE BEST POSSIBLE SOLUTION THAT WE ARE AWARE OF. WE CANNOT FIX EVERYTHING, BUT ALWAYS TRY TO DO OUR BEST TO HELP YOU.
PLEASE UNDERSTAND, THAT PROBLEMS WITH PRODUCTS NOT PURCHASED FROM US SHOULD BE DISCUSSED WITH THE VENDOR YOU PURCHASED THEM FROM.
LOOKING FORWARD TO SEEING EVERYONE AT MUNCIE!
SINCERELY, VAN AND PATTY HAISLEY
Attention: TDR Forum Junkies 
