I know it's not the PC thing to do, but I've gotten away with it before for tens of thousands of miles.

At any rate, I'll be running Isky #9965 springs:

- 245lbs seat @1.950"
- 585lbs open @1.270"
- 1.170" bind height
- .680" lift

My main concern is not having adequate pressure if the heights are off.

 

Duh! That's the whole point .

Its not just PC, its the only way to do it.

Ryan

 

You do have .100" of clearance from max lift to bind which is plenty, but I would definately make sure it's right. A little time is worth alot of money if something goes wrong.

Bret

 

No stock SBC head that I am aware of has a stock installed height that tall. Earlier SBC heads are around 1.75" in stock form, many aftermarket entry-level performance heads open that up to around 1.800-1.850. Haven't run into one that's as tall as 1.950 in stock confuguration.

You can get a reasonably close installed height from a $2 Pep Boys vernier caliper for cryin' out loud! With springs that stout (and probably a real nasty cam bumping things open) you'd be nuts to skip this simple but critical step.