[Tom Goldman]

I have to say the last set of Manley 448 springs I got were the best ever from Manley.
Over 200 runs with no broken springs and only 10-15# loss of pressure across the board.
And that is on a 8300rpm Big Block with a .900 lift cam .
I've used PAC , PSI and Manley , It seems Manley may have caught up with the reliability. AND they always pay the contingency , had issues with the others.