I've used the Butler head gaskets on several engines over the years.
Never had any issues with any of the engines I've used them on.
One set I used on my '64 GTO with a '74 455 bottom end and a '71 455 HO top end. I raced it for ten straight years and after that it sat for over 4 years before I started driving it again on the street. Those gaskets held up for over 20 years while I owned it, I sold the car a couple of years back. Never went back and re-torqued them either, on any engine I've used them on.
Another set I put over 30K miles on over a five year span in a daily-driver '73 455 that was in my '64 Tempest.
Used them on a few other engines as well, never blew any head gaskets using them.
They're good gaskets from my experiences with them, I have another set I'm going to use on a fresh '64 421 HO.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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