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DELTA have given more thought and provided more equipment and stronger
clamps for sealing ports on the sides and ends of the casting than other manufacturers. Many manufacturers expect the engine rebuilder to rely on adhesive to attach plates on the sides and ends of the casting.
You will find most types of cylinder heads can be tested, with the standard equipment supplied, without the need to produce your own blanking plates. The cylinder head or block to be tested can be sealed so effectively that a valid leak-down test can then be carried out at 60 PSI and if a crack is not present the pressure can be retained indefinitely.
A three-way valve is available which allows three methods of testing. a) Using
air pressure while checking for leaks with a bubble solution. b) Using hot water
and air pressure with the water retained in the cylinder head. c) Using cold water
and pressurising with air.