Gday I own a boss 260 sedan, and I'm unsure if its cammed, on cold start its lumpy and when warm it still lumpy I've herd heaps of stock xr8 boss idles and none sound like mine, it has got CIA and full extractors and exhaust system, a couple Mates also say it sounds cammed. (On of them owning a ls1 with a massive cam) also something about the oil pump gears? And under drive pulleys? Anyone send me in the right direction for the 25% underdrive pulleys? And billet oil pump gears? Also a tapping sound on cold start, only lasts about 3-5sec tho, any help appreciated cheers.

Check your spark plugs and ignition coils.