new head and valves...Lapping????


5 replies to this topic
  • brent426

Posted May 20, 2008 - 05:03 PM

#1

I just got my brand new 426 head and all valves. Do I need to lap these valves to the new seats or are they good to go? If I do, what is the recomended procedure.

  • KJ790

Posted May 20, 2008 - 05:12 PM

#2

Don't lap the valves, you can ruin the valves.

  • Markopolo400

Posted May 20, 2008 - 05:55 PM

#3

What year is your 426?

If it's a 2000, lap them, it has steel valves. If it's a 2001 or 2002, don't lap them, you wear the coating off the Ti valves.

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  • brent426

Posted May 20, 2008 - 06:19 PM

#4

this is a 2000 and I ordered the valves from thumpertalk oe store. Have the valves been updated? Are these steel or titianium?

  • KJ790

Posted May 20, 2008 - 07:09 PM

#5

this is a 2000 and I ordered the valves from thumpertalk oe store. Have the valves been updated? Are these steel or titianium?


If you ordered them for a 2000 then they should be steel. If that is the case then it is ok to lap them. I assumed it was one of the titanium valved 426's in my first response, you know what they say about assuming...

  • grayracer513

Posted May 20, 2008 - 07:38 PM

#6

If the valves were roughly $20 each, they're steel. If they were closer to $80 each, they're Ti.

Perhaps a better way to tell is by the part numbers. Steel valves will have a 5BE prefix, while the Ti parts will have 5JG instead.





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