My PD pump failed when a piece of the key that fits on the camshaft broke off and locked up my camshaft causing the timing belt to shear off the cogs and all four exhaust valves to bend. I replaced the valves. All of the valves guides seem to have the same amount of play and based on the spec, i decided not to replace them. I didnt lap the new valves because the valve seats looked perfect with no pitting (engine has 300k on it) The manual doesn't say how to properly install the head. Should I install the camshaft before I mount the head on the engine? If I mount the head to the block without a cam, obviously the valves are not open. I can rotate the crank to TDC and back off 90 degrees so the pistons are half way to TDC and put the head on and mount the camshaft, align the camshaft to TDC and rotate the crankshaft 90 degrees back to where it originally was at TDC. I just dont want to bend any exhaust valves again. Any help would be much appreciated.