Hi Guys,
going to have the head off the car soon to fit a restrictor and the like, looking at upgrading my cams for some more power. turbos are HKS2530s.
currently have tomei 9.15mm 260's, looking to upgrade to 10.8mm 260 procams. obviously with new lifters and springs to suit.
the base circle of the 9.15s is 32mm, giving total lobe radius of 41.15mm from centre of axis.
base circle of the 10.8s is 30mm, requiring new buckets and giving a cam lobe radius of 40.8mm from centre, which is actually smaller than the 9.15s.
Does this mean the head doesn't need to have machine work done so they fit?? or is the lobe thicker on the 10.8, so it still needs some material taken off the head?
also I have HKS forged pistons, do 10.8mm need piston recesses?
Thanks
Alex