Advice. Think my 2F is toast (1 Viewer)

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Joined
Dec 1, 2017
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11
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159
Location
Sutter Creek
Backstory:
1971 FJ40 with a new to me 2F (not rebuilt) which ran well. Approximately 120k miles. My Holley Sniper was having issues, so I sent it off to Holley for repair. Turns out the harness was bad. So I reinstalled the Holley Sniper and harness.

Go to start the rig, small backfire and dies. Start it again and I hear a rhythmic thud noise, which sounds like it’s coming from the block. Engine ran like this for maybe 2 second before I shut it down.

Pulled the valve cover and nothing inconspicuous is apparent. Valve tightness seems appropriate and no obvious deformities to the valve push rods.

I have yet to drain the oil or compression check the cylinders as I am devastated but am expecting the worst.

Any other advice or recommendations are welcome. Thanks
 
If it was running good prior to pulling the sniper I doubt anything happened by trying to start it with the fresh unit. Did you mess with the settings in the sniper or timing or plug wires?
 

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