As there is no proof they have ever ruined an engine and many people have used them on modified Z's for years with no problems, I think that's that proof enough they are fine to use.
JackB nimble JackB quick JackB can suck my dick =P (n/m) - james-lee 19:14:33 11/02/01 Arrogance is the #1 weapon against Supra Owners (n/m) - MikeH(Twin GT35BB Incon Z) 08/06/02