I realise that with the way that A-H head ports are laid out this is
unlikely but I had an Allegro/Maxi engine that would not produce any
power but would idle perfectly. It fooled many 'expects' for some time
but in the end we discovered a blow through in the manifold gasket that
allowed exhaust gas to feed back into the inlet manifold. Clearly as
power started to build up the exhaust gas would contaminate the inlet
mixture and reduce the power available.
--
John Harper
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