Ive used ARP's on YB engines without a problem, its a fastener that very commonly gets used on other engines (Vauxhall XE in both N/A and turbo form for one) without any drama so its weird the way that people seem to consider them a problem on the YB.

Not sure if Tony's comment was meant as a joke or not, but they do stretch when torqued up, they just dont get taken past their point of elasticity so they shrink back down again when untorqued. They provide a good and lasting clamping pressure to the head for umpteen years of use in fact.

Given that the standard ones (if you buy a quality brand like Tony suggests) are well upto the job though, you may as well just go for those.