the only thing with the 280's, is they only lift to 9.5mm, but when the head was on the flow bench, the head kept flowing the higher the lift, some engines just stop flowing, no matter how high you lift the valve, i was wanting something like 10mm or 10.5mm lift, it did flow even higher figuers at 11mm, but i din't quote the cfm for that. as knowone ever made a cam that high.i should of bought diggles old cams for cheap, but din't know they were for sale until they had gone.
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 fj20/et a replacement for displacement 
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