I eliminated a slew of shims

Just used the spring seats to locate my new springs.

 

Now it won't sound like a "bill to coin changer" when you over rev it!

 

Mark,
You had locators, plus multiple shims under the TA 1130 super duals?

 

Yeah, it was kinda like total overkill.

 

Yes, that’s what the machine shop had put in to get the spring pressure up for my roller cam.
The machine shop ( not the same one) that did the bigger TA valve install cut the spring seats too low and the step at the base of the guide that locates the spring too narrow, so they used spring seats to locate the springs properly, but that also increased the seat height by .060
My 1130 springs needed too many shims for proper seat pressure, then they would go into coil bind at full lift
Hence the reason for the 1125 455 springs, they’re taller, slightly heavier coils make about 180 seat pressure and 380 full lift, it’s way more than I need but it’s the best I could come up with with my iron heads.
The engine is gonna have to deal with it

 

If you went with bigger exh valves without seat incerts then the heads will not live with that 180 psi for long since you cut away the factory induction hardening!

 

It might do fine. This is high nickel content iron after all. It's harder and tougher than Chevy iron.

Jim

 

I'm confused. Isn't Mark talking about the spring seats and not the valve seats?

Devon

 

Yes the spring seats

 

Honestly my only concern with the higher than needed spring pressure is noise from the valves being slammed back on their seats.
The roller cam isn’t radical, but the valve action with rollers is quicker, so I don’t know
Not so much concerned about the roller lifters, they’re Johnson, not the noisy Morels that I had in the beginning.