Using the stock 2 groove keeper (As found with rotator set up) with an intake retainer, the installed spring height will change by 100 thou. looser, shims of the equivalent amount would have to be added under the stock short exhaust spring to make up the difference. No off set keepers are not available. Using an intake spring with this set up on the exhaust also has a installed height issue. It becomes 100 thou. too tight, spring pad surface of the head would have to be modified (not advisable). The correct math is only found with the use of the 4 groove valve and keeper to use with a stock length intake spring on the exhaust.
