OVersized Valves

[The grey ghost]

how can i get OVersized Valves for my 2003 400ex?

[440exnacsracer]

i beleive dennis kirk carries kibblewhite valves for the 400ex that are oversized. if not, try duncan racing. you do know that with the oversize valve, you will have to get a valve seating job done and port/polish

[mojoe2878]

Originally posted by 440exnacsracer
i beleive dennis kirk carries kibblewhite valves for the 400ex that are oversized. if not, try duncan racing. you do know that with the oversize valve, you will have to get a valve seating job done and port/polish
and it aint cheap

[The grey ghost]

how mach we talkin about here? lol

[Silverfox@C&DRacing]

We sell the oversized intake kibblewhite valves and the heavy duty springs..

[The grey ghost]

How much for the 2? Silverfox@C&DRacing

[The grey ghost]

come on some 1

[440exnacsracer]

the valves are around 70 a peice i believe, then the valve job and porting will be around 300. be an awesome mod with a big bore kit though and a good exhaust, and a cam, and a carb.....and ,..and....lol:D

[cals400ex]

i thought they were like $30 per valve. but i don't know. if it would make a difference i would do it with my 426. i just don't know if it would make a nice difference. i already have an aggressive port job.

[440exnacsracer]

i just don't know if it would make a nice difference.

well just think about it this way....with 3mm larger valves in both say 15 mm intake ports, that should equal a 20%increase in air flow with a good port job...i could be wrong:confused:

[Out_Sider]

it'll be worth it, im getting bigger valves put on my 300ex head along with a 3 angle valve job, and a port and polish job done by GT Thunder. i already got a cam, rockers, hd springs w/ TI retainers, and all that

[cals400ex]

the 300ex head is more restrictive than a 400ex's head. the stock head on a 400ex isn't all that bad. i do have an aggressive port job but stock valves. 3mm would be way way over kill. i think chef is only running +2 and he has to be well over 50 horsepower. most people recommend +1's on the intake side and that is it. i don't even think +3's will fit in the head properly. :confused:

[mikeboone]

Originally posted by cals400ex
the 300ex head is more restrictive than a 400ex's head. the stock head on a 400ex isn't all that bad. i do have an aggressive port job but stock valves. 3mm would be way way over kill. i think chef is only running +2 and he has to be well over 50 horsepower. most people recommend +1's on the intake side and that is it. i don't even think +3's will fit in the head properly. :confused:

I am pretty sure Chef runs +3 intake and +2 exhaust. I do imagine the velve seats require major mods to make that happen though. +1 on both is plenty enough flow for 99% of these motors.

[cals400ex]

Originally posted by mikeboone
I am pretty sure Chef runs +3 intake and +2 exhaust. I do imagine the velve seats require major mods to make that happen though. +1 on both is plenty enough flow for 99% of these motors.


yeah, you could be right. i remembering him telling me he wanted one thing and he ended up getting 1mm larger than that. i really don't remember.

[400sEXridr]

what is a 3-angle valve job? I know white bros has kibblewhite valves for about 30 each

[foleyit]

The area where the valves seat when they are closed. The 3 angles on the lip are: 30, 45, and 60 degree angles. You can feel the angles with your finger when you rub your finger along the edge.

[400sEXridr]

is this just opening up the valve pocket so the new valves will fit?