Head Porting Question

[Pushit2.0]

I have check both stock DSM and Crower springs and found that at a installed height of 1.57"(stock) that the crower is 7% stronger then stock and at ~.460" lift the Crower spring would be 10% stronger then stock. This was a used stock spring compared to the new Crower but I think the 3% stated by Enginetecs is a little low. Crower springs and retainers with a good valve and valve job with be what most need for their dsm. Then if more is need 1mm over and some port work to fit the setup to produce the most power, its all about sizing everything in the setup to work together to net the best results.

~John