rosten-performance dual valve springs contains dual valve springs and custom Titanium retainers to allow more valve lift and improved valve control on high RPM and high boost engines.
These springs have validated their performance on 400+hp drag racing and tractor pulling combinations.
- Seat pressure 73lbs compared to the stock 57Lbs, an increase of 28%.
- Open pressure at 10mm lift is 195Lbs compared to the stock pressure of 145Lbs, a 35% increase.
- With 11mm valve lift there is ~2mm to coil bind.
