Ive heard it used time and time again. but what is it exaclty, why do i need it and what does it do for my car?

thanks

 

three angles on the seat instead of the standard 1. better flow of air of course, due to the smoother air transition.


not gonna do much on a street car, unless other things are done to improve airflow also.

 

it was included wiht my new head, i was jsut w ondering wht it was gonna do for me

 

generally they're gonna need to do a valve job anyway to make sure that each individual valve sits right in its own little port... and since they're doing it anyway, mi'se well do 3 angles.

 

its not quite that simple....but yes, most heads do benefit from it. a five angle is a BITCH to do, but a three angle one isnt too bad. adds a decent amount more time though.

 

I know three angle was the standard vavle job we did when I worked at a machine shop.

 

you learn new stuff everyday. anyone attending TCC for auto mechanics?

 

Maybe this picture will help describe it some? The top angle is 30, the blue angle is 45 and the bottom is 60.

 

what kind of head? was this a performance shop?

 

i know with 5 angles, on the dyno there is a slight, but noticeable difference found in the lower end. three angles is pretty standard unless you decide to lap the valves 'in' instead. the 3 angles helps to recondition the seats before hand lapping. just makes for good sealing and if there are pits in the valve seats, they will be removed or is a 'nice' discovery in order to do something about it while the head is off.