They were originally designed for the Winston Cup/Busch crowd in dry sump application only ( no
Oil Pump load induced). They have recently completed testing for wet sump applications and have said the rersults were quite promising. I'm told cost is about 3 times that of metal gear and last much much longer, with very little wear on cam and gear. Comp cams has them and others will come on board too. SB Chevy and 351 Windsor currently, 302 to follow (smaller bore). Jury's out.............
[url]www.PerformancePlastics.com
Rick