Yesterday, 10:14 PM
Whilst at Moreton Marsh for the centenary, I experienced the same problem. High Compression Ruby cylinder head. Noise from the front of the engine, no loss of power. My initial thoughts were blown exhaust down pipe gasket. placing my hand near the front of the exhaust manifold, revealed the leak was from the front of the cylinder head/block. Removal of the cylinder head revealed the head gasket had blown away completely between the two front head studs, but was still sealing around the cylinder bores and water jackets. replaced the head gasket. problem cured. I now do regular checks on the tightness of the two front head studs/water outlet.
John
John