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Old 01-04-2018, 09:55 AM   #1  
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Compression Ratio

Hi all, Iím trying to find out if the 383 Engine in my 71 Cuda has the 9.5 or the 8.5 compression. The block casting is 2468130 dated 9-11-70 the heads are 2843906. Not a numbers matching car and couldnít get much info from previous owners.
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Old 01-04-2018, 12:16 PM   #2  
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You would need to know what heads it has are they stock pistons has it been re bored What is the cranking compression reading. That a side for a 383 most likely a 9.5 to one
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Old 01-04-2018, 05:49 PM   #3  
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I would say 8.5.1 C.R.
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