360 magnum. Safe boost rumours. True or false?

was it on a GM engine as here is one I found
http://www.hotrod.com/how-to/engine/hrdp-1109-stock-gm-ls-engine-big-bang-theory/
and this mopar one
http://www.hotrod.com/how-to/engine/ccrp-1303-hemi-5-7l-junkyard-turbo/