March 15, 200521 yr There is a slight difference in length on Hydro Lifter Pushrods versus Non hydro lifter Rods..... Also If you have a Hydro block it has Hydro lifters in the bottom at the cam that those pushrods Work with.... If you happen to stick the Loger rods into a Shaved Non hydro Block you could bend Push rods or Valves Possibly.... You can use Non hydro Heads and Pushrods on a Hydro Block, But you need to keep the non- Hydro Components Together.... I had the opposite Problem on my last Built Motor from CCR I sent them a Hydro Block, and Kept all my Pushrods and Rockers here.....I got back a Non hydro Block accidently, with Non hydro Lifters...I put the thing together , and Had ZERO Compression ......???? Due to the fact that the Lifters/pushrods were keeping the valve train open I had to adjust My Rockers out a Bunch to get it to work.....And change Pushrods out For non hydro Ones...... Hope this Clears it a bit for you...... Later, John
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