I honestly don't know

I mean, you can get larger valves, and lighter ones, or different length

but whats with the angles?

 

u know where the valve sits on the head. imagine a valve installed on teh head the part where the valve touchs the head the outer circle man i should just get you a picture but basically where the valve sits in the head. too make sure there a good seal they do a valve job. valve job also helps with flow of the head its considered one of the most important parts when porting.

 

so whats the difference between a 3 angle valve job and a 5 angle valve job?

 

im guessing the angle of the valve seat :dunno:

 

Here is a picture of a "valve job". The angles or radius allows the air to turn the "corner" at low and mid lifts (the most import flow occurs at low and mid lifts). Also a good valve job increases combustion chamber seal. Sealing is a cornerstone to making power.

 

so when you get a valve job done do you need new valves?

also, is there any down sides to valve jobs?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SiRhatchalot &raquo;</TD></TR><TR><TD CLASS="quote">so when you get a valve job done do you need new valves?

also, is there any down sides to valve jobs?</TD></TR></TABLE>

No, you can perform a valvejob on the head with the existing valvetrain as long as the valves are in good shap.

As long as the valve job is good (well done and seals good), there shouldn't be any downsides.