mercutio wrote:all sorted i have fitted a rocker cover with cut outs to show off the skunk2 cam gears the cover was shrinking and expanding at the centre of the cut outs meaning the bolts were hitting it stupid stupid stupid lol engine is purring like a psychotic kitten
i noticed mine would be doing the same during the build so replaced the bolts with slimmer ones 
010.9 fke high tensile steel boltsNafemanNathan wrote:@Drax. Are those anodised aluminium button head bolts? I'd immediately replace those with stainless or plated steel cap heads if they are mate! There's no way I'd rely on aluminium bolts to keep those cam gears in place at high speeds. For one, button heads have a smaller hex than cap heads, so you'll never get the same amount of torque as a cap head, and if you did, you'd most likely round them off in the process, and then that's increased further if they're aluminium. Plus aluminium bolts being softer, won't take long before they're no longer gripping as much as when you first tightened them.
exactly the same area of contact as the originalswurlycorner wrote:Look like steel to me. Can't make out the stamping clearly enough to work out and check the manufacturer / grade codes though.
They're only something like M6 screws anyway aren't they? In which case - unless you have a set torque from the Cam gear manufacturer that says otherwise, you're only going to be in the 8-12lbft region for torque setting anyway and there's no problem achieving that via the hex internal drive.
I might be more concerned about the area of contact patch difference between the back of the screw head and the Cam gear (cap head may be smaller than equivalent hex head screw)
