Yeah, when they were first being released for the 7M they were all studs. ARP didn't realize that two needed to be bolts to clear the oil pump asy.
If you get a set that was all studs that you recently bought, then that box has been sitting in a dusty corner on some shelf at the warehouse for...
But why did you get rid of it Ian? I thought after a while of DDing in one session the coolant heated up to where you couldn't drive it hard due to hotter inlet temps??
Maximum allowable warpage for the head is 0.10mm or 0.0039"
IIRC the cylinder head is 116mm thick from base of head to base of cam caps, don't quote me on that though, search that one, it's on here.
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