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Old 04-21-2013, 03:05 PM
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cylinders 3 & 7 dead

Hi, ford flat head problem. 42 ford newly overhauled engine while running makes thumping type noise runs rough fire at all cylinders, compression at all cylinders cyl 3&7 are not working. pull sparkplug wire on each while running does not effect running act as if both cyl are dead. pulled heads and valves seem to be functioning going to re-check valve adjustment. ignition has been up graded to pertronix . did have to re adjust valves after receiving engine from builder not adjusted right by the builder. before adjusting valves had no compression except 3&7 cylinder after adjustmanet all cyl have 120 compression. just don't run right with the noise and the dead cylinders 3&7. what do i lool for next?

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Old 04-21-2013, 04:30 PM
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3 and 7 have the spark plug wires crossed? Just a thought
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Old 04-22-2013, 03:23 PM
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what kind of intake and carbs? possiable there not getting any fuel?
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Old 04-23-2013, 11:53 AM
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If there is no compression in a cylinder it can lead to 2 issues.
1- valves not opening. Which leads go a bad cam lobe, bent valve, or bad spring.
2-broken piston rings
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Old 04-23-2013, 02:35 PM
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Add valves not closing, blown head gasket.
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