Valve Jobs....Power?

[Hilander]

What power would the following types of valve jobs give on this combo.

Built motor with ported heads putting out 650 hp.

Normal 1 angle valve job

3 angle valve job

5 angle valve job

 

[Fade 2 Black]

Valve contact treatment won't make any differences in power. The multi-angle jobs give better assurance of sealing when closed due to the smaller area of valve to seat contact area.

 

[Hilander]

Valve contact treatment won't make any differences in power. The multi-angle jobs give better assurance of sealing when closed due to the smaller area of valve to seat contact area.

Thanks for the input. I was under the impression in helped speed up air flow and hence a small power increase. Total sealing would surley increase power too?

Can't see why it is done so often if there is now power gain :??:

 

[WhiteBolt]

If done at the correct angles, multi-angle valve jobs will increase HP.
http://www.chevyhiperformance.com/techarticles/89678_valve_angles/index.html
http://www.enginebuildermag.com/Article/2586/high_performance_valve_jobs.aspx
http://www.stockcarracing.com/techarticles/78578_making_valve_jobs_work/index.html
http://www.carcraft.com/techarticles/116_0612_valve_angle/index.html