Hi guys, I need help selecting valve spring and retainer to go with Tomei Procam 270 (Evo IX MR)

The cam is rated at 11.5mm lift. what it means in term of maximum RPM?

There is Beehive, dual, single spring, etc, is there any benefit going towards the more expensive Beehive over single?

Tomei spring is quite expensive but rated to 11.5mm, but GSC has Beehive spring rated to 12mm, does that mean I'm better off with GSC spring and retainer?

How about other springs which only rated to 10.8 or 11mm? Will it be suitable?

I want the engine to rev up to the safe limit of the cam and spring/ retainer without putting too much stress on other weaker components, any though?

Thanks
Joel

 

You need a good spring to handle the lift of the cam.

Since your cam net lift is 11.5mm.

Springs rated to handle 10.8 or 11mm is a no go, you will hit spring bind, and break parts.

Now the springs that handle 12mm ir more are the omes you need to look at.

Some cam grinders will have min pressures they want used with the cams.
Check the cam card and see if there is any such listing.

It should say something along the lines of, XXlbs valve closed, xxlbs at full lift.