Questions About Valve Springs, Valves, Etc.

[yoshiii335]

Hello

If not building a track car and only aiming for 400hp in a rb20det or 500 hp in a rb25 det, is it necessary to put in aftermarket valves, valve guides, etc if doing a engine rebuild due to the age of the engines and wanting reliability or are stock ones good?

Are oversized valves worth putting in?

[Ben C34]

No.

No.

[yoshiii335]

No.

No.

Cool

[GTSBoy]

Although, that depends on how worn any of the original parts are. Nothing good comes from putting and engine back together with worn valve guides.

[yoshiii335]

Although, that depends on how worn any of the original parts are. Nothing good comes from putting and engine back together with worn valve guides.

I will replace if have too, just wondering if the aftermarket parts are necessary.

[GTSBoy]

You would use the valve guides recommended by the workshop who was doing the work on the head, regardless of whether they were aftermarket or OEM.