| You said you've done your math so obviously you have some stress-strain data of the ARP stud....and combustion peak pressure + nitrous..etc .What did you find out? Here's a very simple test which might be interesting. Using a complete stock engine, remove the stock head bolt and washer, observe the area when the washer sits. Then using ARP stud and washer, torque to factory spec and follow the recommended steps. You could use molylube for the washer and stud to get proper torque if you want. Remove the ARP stud and washer, look at the area where the ARP washer sit, then compare to the area where the stock washer sits. Take note of how much the ARP washer "sink" into the aluminum head, just by torqueing. With the aluminum head giving way to the washer, the head lifts. Of course there's other factors that will cause the head lifting/bolt strecthing, like ungodly amount of nitrous plus high boost, detonation, bad headgasket, sealing, piss poor tuning etc... A ~1000hp Z properly tune/build with no detonation etc should not have the problem. I don't know your definiton of 1000 + HP, 1200rhwp? 1400rwhp? please define. Thanks!
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