Well im bord and waiting for my new motor so im going to try the dx head on hf block to once and for all see if the artical was right. i figure im tossing the motor anywase its got 300,000 miles on it so why not test a thory first. i will post the results in a week or so when i get the head installed. taking friendly bets on how long you think this will last, im giving it 1/2 hour running max, you?