V6 leakdown test problems

[michael@domain.elided]

Hi:
I did a leakdown test on a 2.5 liter engine I'm planning on installing in a 
time-trial car.
When removed from the car, the engine had been running well (seemed to be 
making good power [1:45 at Willow Springs], did not smoke, 1 qt per 1000 
mile oil consumption etc).  The engine has a Sperry head, done about 9 
years ago, but I'm unsure if the head has been freshened up since I bought 
it in '95.
Anyway, the leakdown test showed about 90 - 100% leakage from all 
cylinders!!  Seemed to be leaking equally from exhaust and intake ports.
When I removed this engine from the car a year ago, I changed all seals and 
installed a good set of stock cams.  I'm wondering if some carbon from the 
intake runners might have fallen into the cylinders thus causing the valves 
not to seat?  Could an engine with this amount of leakage run this well (or 
at all)??
I tried taping on the cam follower to briefly open the valve while the 
leakdown tester was still connected (hoping to blow out any carbon in the 
valves) but this did not improve the leakdown reading.  I'm quite confident 
that I did the leakdown test properly since I tried this on another Alfa 
engine and got good readings (5% leakdown).

Does this engine need a head job or are the readings screwed up?
Opinions much appreciated:
Michael
www.gtv6.org
1985 GTV6 3.0
1981 GTV6 2.5 (in progress)

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