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Discussion Starter · #1 ·
just installed zz4 in 1971
fired it up and it has a clicking noise
adjusted valves and still it clicking
what other things could be clicking

50 pounds oil press at idle 75 pound at cruising speed
could it be a bad lifter
 

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Discussion Starter · #4 ·
Its Mechanical Pump Its Off Old Engine 2inlet 1 Outlet
When I First Fired It Up No Clicking
2 Days Later When I Started It Clicking Was Very Bad
Shut It Off Ana Nearly Smashed Wind Shield !!!!
Started For Friend Next Morning Clicking Was Very Much Lighter
 

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sounds like an exhaust leak,check exhaust manifolds/header bolts and look for a blown gasket.
 
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