[TR] TR4 road draft tube plug

Geo Hahn ahwahneetr at gmail.com
Mon Sep 7 12:52:51 MDT 2015

On Mon, Sep 7, 2015 at 10:08 AM, Brad Kahler <bkahler1 at gmail.com> wrote:

...Also, is your valve cover cap vented (i.e. TR4A style) or non-vented?

Those terms (or something) confuse me.

My late TR4 does not have a vented cap - it seals tight.  I presume that
TR4As are similar.  Early TR4s and all TR3s had a cap that vents to the

If you are fighting blow-by (and I think you are) it would seem that a
vented cap might help -- and since your engine apparently has a road draft
tube fitted as original then I believe a vented cap would have also been on

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