What exactly is a 3-angle valve job?
 

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

Re: What exactly is a 3-angle valve job?
 

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.

Re: What exactly is a 3-angle valve job?
 

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

Re: What exactly is a 3-angle valve job?
 

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.

Re: What exactly is a 3-angle valve job?
 

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.

Re: What exactly is a 3-angle valve job?
 

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

Re: What exactly is a 3-angle valve job?
 

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

Re: What exactly is a 3-angle valve job?
 

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

http://www.hanzenginehouse.com/HANZE...lve%20seat.jpg

Re: What exactly is a 3-angle valve job?
 

what kind of head? was this a performance shop?

Re: What exactly is a 3-angle valve job?
 

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.

Re: What exactly is a 3-angle valve job?
 

It comes stock on a factory LS1 style head, I don't know how much more street you can get than that. You are correct that the airflow dictates the use of such small details.

Re: What exactly is a 3-angle valve job?
 

We all know LS1 heads > *

Hell LS1's in general > *

:D

Re: What exactly is a 3-angle valve job?
 

They did it on nearly all their heads. The shop was not a performance shop. The did do some performance work (porting and sleeving)

It had been open for 80 years when I started working. Two of the machinists had been there for nearly 40 years.

Re: What exactly is a 3-angle valve job?
 

Something interesting that I've never seen before, Z1 motorsports offers a rediculous 14 angle radius cut valve job on their stage 4 motors, here's the link... http://www.z1motorsports.com/product...products_id=58

Re: What exactly is a 3-angle valve job?
 

GM started using it on production heads on the Vortech's in 94+, i figured they would use it on the LS's.


damn. my shop does a standard one angle on most unless i ask :thup:

unless they have changed their machine shop, which i think they did when they went to their new facility, i have seen quite a few problems with their engine work. again, i think they changed though, so i might be wrong on it.