C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Engine backfiring after rebuilding top end

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Old Sep 7, 2022 | 11:36 AM
  #21  
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Put your thumb over the #1 spark plug hole and turn over the motor. When compression pushes your thumb away you're on #1 compression. Now just roll the motor til the timing marks align, that's TDC, provided the inertia ring on the balancer is still well bonded.
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Old Sep 9, 2022 | 08:30 AM
  #22  
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Another thought, It is very easy yo get the #5 & #7 plug wires crossed. They fire right after each
other & the engine will run but wont be happy.
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Old Sep 11, 2022 | 09:33 PM
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Possibly the valves are adjusted to tight.
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