Roy has ported them and gently reshaped the combustion chambers to make them breath better, together with some subtle valve reshaping.
Its hard to do them justice in the pictures but here they are, much smoother ports, better radii, and less projections into the flow, got to be worth a few HP
I should have them re-assembled tonight, ready to do the tappet shims tomorrow, got to keep moving as the car is due to have the manifolds made in a week or so
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