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Valve stem tend to just puff smoke on overrun/rev drop as you shift, rings would give a solid flow at most times.
Or coulr be q mistake in tye head build process, even a wrong HG or upside down (done it twice myself).Today went for a random blast in the brickwagon, been driving the misses bluemotion polo for a bit and so much nicer to have some actual grunt under the foot. Also the wagon handles so much better in every way I can think of (as much as a wagon with stock arms and non track arb will allow). Also comfort armchairs, such win.
BrickMan
russmeyer
Could be valve stem oil seals?
(Unless you did these as part of the head work)