CLASS RACER FORUM - View Single Post - Valve Spring Pressure

gsa612 · 06-26-2018, 08:45 PM

The spring you have is to long.To have 250 on the seat your probably in at 2 in.,now subtract .400 lift your at 1.600.Coil bind is at 1.150,I can see the spring being unstable.The problem with the 325/396 is you only have.398 lift,so you have to find a short spring that would put you .50-.100 from CB.That would make it more stable.CC should have a spring that would work in those parameters.If you find one I would put it on the dyno and see if the rpm and HP go up.On your initial pulls your down quite a bit both ways.If it's still down after the change, give Bullet a call and see what they recommend for a cam.The good thing here is you didn't have the Shubeck's in it.. gsa612

06-26-2018, 08:45 PM	#21
gsa612 Senior Member Join Date: Jan 2008 Location: 100th Meridian Posts: 569 Likes: 116 Liked 280 Times in 139 Posts	Re: Valve Spring Pressure - BBC stocker The spring you have is to long.To have 250 on the seat your probably in at 2 in.,now subtract .400 lift your at 1.600.Coil bind is at 1.150,I can see the spring being unstable.The problem with the 325/396 is you only have.398 lift,so you have to find a short spring that would put you .50-.100 from CB.That would make it more stable.CC should have a spring that would work in those parameters.If you find one I would put it on the dyno and see if the rpm and HP go up.On your initial pulls your down quite a bit both ways.If it's still down after the change, give Bullet a call and see what they recommend for a cam.The good thing here is you didn't have the Shubeck's in it.. gsa612