Planning to install my spare Y8 intake spring (brown - 14761-P2J-003) to replace my Y5 intake spring (white-14761-P2M-003) right in my spare cylinder head for my Y5 engine.

I suppose that these Y5 springs are softer and limits the redline in my engine.

Does somebody know the spring rates for both?

Will the roller followers/rockers in my Y5 stand the stiffer Y8 springs without any issues?

Thanks.