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About 12 years ago I did this valve seal replacement with the help of my neighbor who was a Ford mechanic. My car was also a B21A carb (SU).
We had to put compressed air inside each cylinder we were working on. We did fit an old spark plug with a 1/8 npt nipple to feed 125psi while we were working on changing the valve seals.
If I remember well he had a valve spring compressor that we bolted (or attached in some ways) to the head to push the pring down. The half circle locks were loosened with a hammer and punch while top washer was pushed down. The two small locks were pulled with a magnet, spring removed and valve seal replaced. All this was done while air pressure was applied.
Today I realize safety must be first. Doing it this way may cause injury unless face and eye protection is provided.
Before I did the seal replacement I first tried with success something called ''stop leak'' made by Wynn I beleive. It was a engine conditioner that softened the rubber seals (also crank seals) and I got 4 more years before doing the above seal job.
Hope someone else has an easier way.
Good luck.
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