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Old 10-05-2003, 03:41 PM
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Head Castings

Hey guys, I just pulled the valve covers off my 396 and discovered that i have 2 different heads on my car. the passenger side has the #3931063, showing a 396/402 head. The driver's side has the # 3993820 on it, showing a 454 head. What kind of effect is this having on my performance? I know the 396 head is closed chamber, the 454 head is open. Is this doing any damage to my engine?, and where can i find a matching 396 head for the other side?

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Old 10-05-2003, 05:49 PM
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The 820 head will have much lower compression than the 063, also the 820 head should have the small spark plug while the 063 should be an "N" series AC. long type plug, heads are available at most automotive machine shops.
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