rocker question?

[4thgentruck]

This may be a dumb question but what is the diff between 1.5 and 1.6. Askin for a 906 vortec on a 400 sbc build

 

[foamypirate]

It's the rocker's ratio. A 1.6 ratio rocker will give you a little more valve lift with the same cam than a 1.5 ratio rocker would. It's basically a multiplier.

I think most cam manufacturer's give the cam's lift into with a 1.5 ratio rocker. So say your cam lobe has 0.300" of lift. You would multiply that by 1.5 to get how much valve lift you would get.

0.300 x 1.5 = 0.450" of lift.

 

[Driver4r]

You have to watch your valve springs when talking about rocker ratio. To much will cause spring bind, and they will be contacting eachother coil on compression.

 

[4thgentruck]

Im thinking of running the beehive springs but not totally sure. Just trying to get all my info down so i can start buying and assembling my motor.

Thank you for your quick replies.

Any opinions would be greatly appreciated