traded a guy for a set of new prc single behive prings .625 lift. called texas speed and they said they are actually good for .650 but only warrenteed for .625.

so basically are they good for boost or should i sell and go with dual prc 650 or pac 1518's

my cam is the 54-481-11 so its close at .621 .617 on 115

 

i would run duals if it was going in a built engine. i see your sig says forged lq9

especially if you have any kind of money in the engine

 

Dual springs on anything you care about.