[Healeys] A bit of tuning advice

[John Harper]

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