10vt Head Modifications

Todd Phenneger tquattroguy at yahoo.com
Sat Sep 15 17:00:03 EDT 2001

  Thanks for the info.  I dont think I want to go as far as
moving the guides.  But I do have an 82mm Bore so thats good.
  So what size Exhaust Valves should we be looking at here. 
33mm is stock if I remember right.  Is 35mm a good bet or do you
try to squeeze 38mm valves in there?

--- Jorgen_Karlsson <jorgen.m.karlsson at home.se> wrote:
> Hi,
> I think that bigger exhaust vavles are the way to go, most
> engine builders I
> have talked to say that a port job is enough on the intake
> side on any turbo
> engine. Two of them wasn't sure that 40mm intake vavles would
> make any
> noticable difference on the turbo engine.
> Both of them recomended bigger exhaust valves, one of them
> wanted to see if
> it was possible to install bigger lifters and vavle guides
> that was offset
> to the center of the cylinder.
> He was concerned with cylinder wall shouding on my engine, the
> alternative
> would be to use a bigger bore but he didn't know of any high
> powered 10vt
> engines with a big bore. But he could se lots of reasons to
> stay with the
> small bore instead.
> Anyway, if the bore is a bit bigger then my 79.5mm the
> shrouding is not a
> big problem.
> A guy will send me a head broken beyond repair, I will slice
> this to prepare
> for a real port job. I will post pictures of the slices
> somewhere when I get
> it done.
> Jorgen Karlsson
> Gothenburg, Sweden.

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