REMFLEX GASKETS BLOW OUT

In 3 years I have had 2 blow out on number 7 cyl I was in first gear and stood on it I got my new 650 holley on ,that shure woke it up for sure,any how by the time I let off bang another blow out.i do keep an eye on the header bolts.dont who why this is happened.thease are old hookers made well back in the day.