High rpm components, let's cover everything.

[Clueless]

How much does it cost to get the head machined for 1 or 1.5 mm OS valves

 

[gofastgeorge]

The oil pump drive shaft should be hardened for rpms above 8k. Mibrum used to break them spinning 9k rpm, before switching to a custom made billet shaft.

Been turning mine to 8500 on almost a daily bassis for 8 months now

What I did to the shaft was to cut the old 4M mechanical fuel pump cam off it,
so that it was not acting like a bob-weight.

 

[IJ.]

Just machined mine round

 

[Adjuster]

I am running 1mm OS stainless valves, and I think my valve job was 250.00, but I had them machine the seats ID as well as just grind the 3 angles to the seats..

Then I blended the now larger ID valve seats.. into the runners. (And the other mods noted..)

My oil pump shaft is machined to clear the Pauter rods.. (Remember, I'm running a 97mm stroke engine.. What's stock.. 90.5mm...?) It is not any thinner than stock.. the thinned down areas are just slightly wider.. On a the previous stroker, when the crank twisted out of true by 7thousands, it had the shoulder of the rod hitting the oil pump drive.. actually pushed the rod forward, and ruined it by ramming it into the retainer plate. I was suprised it did not break it. The Pauter rod was fine. I sent it back to Pauter, they checked it out, and said no problems.

I do not plan on turning this engine faster than stock.. but have reccorded 7150rpm on the Eman blue/Profec E-01 on a missed shift..