Originally Posted by
JamesH
Rod/Mark,
I thought with the 106 or 108 fuel you've used before, you could get a lot more spark in on Evos and they loved it, but the Cossie would just pop the head gasket? If so, how is it going to be different on the purple?
To add to what Mark has said. We now fit 55% higher shear strength bolts & have done block mods to aid head gasket integrity. However Mark does not want to add extra ignition than we did on the 838 engine that proved safe. The Purple does not need extra ignition just extra fuel to make a 10% increase over 106. The vibration mods will be more critical at this Power level than gasket integrity im sure.