[Formulajones]

Originally Posted by grivera

Could the high spring pressures cause the bleed down issue?

200 lbs on the seat certainly would be approaching that threshold.

It's why I've always advocated spending the money to lighten the valve trains as much as possible so you don't have to get too crazy with springs and still have a hydraulic roller that spins as high as you need.

The blueprint 598 I bought only has about 145 on the seats on the ones I checked which matches the paperwork they sent. Not near enough on a BBC with a 2.30" intake valve. And that's exactly why they stopped the dyno at 6000 even though it was still climbing in HP. I highly suspect they ran into valve control issues and cropped the dyno sheet right there.