Dual valve springs stock on 2.02 915 J Heads?

stumblinhorse said

Still learning. the coil bind is more on the single then the dual. So let’s see if I understand. Coil bind is how small the coil can be compressed? So smaller number is better?

So if my cam is .525 lift and coil bind is 1.140 and the installed height is 1.7, I am .0035 ok. Right?

Click to expand...

The seat height on the dual spring is 1.7. The coil bind is 1.020. So, 1.7 minus 1.020 is .680. That means you can run probably about a .650 lift cam and be fine. That's .030 before coil bind.

The seat height on the single spring is 1.8. The coil bind height is 1.140. So 1.8 minus 1.140 is .660. So that means you can run about a .630 lift cam leaving about .030 before coil bind.

But here's the thing. I THINK the small sets up "around" 1.7" on the seat. 1.8" is the big block figure........IF I remember that right. Someone correct me if I am wrong here.

IF that's right, that means those single springs will set up at 1.7, not 1.8 where they are specced to have 109 LBS on the seat. That's only .100" difference, so probably not a concern with spring pressure.

Let's do the math using 1.7 and the single spring.

1.7 minus 1.140 is .560.

Your cam is .525, so that will probably work. I would just double and triple check everything.