Valve job question

[Ididntdoit]

See pic.....whoever did this valvejob used a straight cutter - the valve is 2.09 and the diameter around it is 2.23 the resulting groove is almost as deep as the margin of the valve - the rest of the work is good.....so the question is, is this OK? How much will this effect flow?

[RJP]

If it were mine I'd knock that sharp edge down with a 15deg cutter assuming the intake valve/seat is a 30deg. as is most 2.09" valves are. If the valve/seat are 45deg. use a 30deg cutter and finish with a 15deg. cut. JMO

[Ididntdoit]

Would going to a larger intake valve (2.25) help the situation any?

[cammerfe]

I agree that the edge needs to be trimmed back. RJP's advice is spot on. No need for larger valves---the seat job was simply left unfinished.

KS

[sumfoo1]

agreed.

[RJP]

Would going to a larger intake valve (2.25) help the situation any?

No...Even if the 2.25" would fit the 2.0" C/L of the 2 valves, the valve shrouding would inhibit flow and you would have a net loss of flow.

[Joe-JDC]

I recently had a CJ head that someone had done a "killer" valve job to, and installed new valves, etc.  When I pulled it apart, they had installed a 2.190" intake valve on a 2.090" valve job.  I decided to flow the head and see just where it was with that combination, and found that the intake flow was down from a stock 2.090" intake by about 20cfm.  Just because something will physically fit does not mean it will work better, and bigger is not always better when it comes to valves in the FE head.  I installed a 2.100"  intake valve with new valve job, and picked up nearly 45cfm over the initial valve job with the 2.190" valve.  Joe-JDC.

[TorinoBP88]

Are the valve heads low (sunken in) or high (sitting up proud?)  Higher will run cooler and reducing detonation, and breath better because they get out of the way sooner and let flow in.

[Ididntdoit]

the top of the valve is about .020 above the floor of the chamber.....so they are pretty low - I would define high or optimal as the entire margin of the valve being above the floor of the chamber...