how do the mail order tunes work i am doing an L67 top swap and want to use stock computer it is manual so using original loom also not sure how it works
Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.
They definitely won't hit the valves, nor are special rocker covers needed.
If you have any more questions please don't hesitate to ask.
Kindest Regards,
Steve