Gas backfire worry

I ASKED the experts at LPG Australia. Their opinion is that plastic is fine when new, but over time deteriorates and can become increasingly brittle. If, for whatever reason, a brittle plastic manifold were subject to extra pressure during a backfire on LPG with a first or second-generation system (where air and fuel are mixed in the manifold), then damage could result. Based on that, I would opt for the sequential vapour injection, even though it costs more. The only injection system that I know of being offered commercially for the 5.7-litre V8 is through Victorian Autogas (a Tartarini system) which is a slave system. It takes an injector pulse and seems to sort out the mixture at high revs. Victorian Autogas has tested the system on an SS Commodore with success. They can be contacted on 1800 620 945.