A few numbers for 1966 engines.

• Engine Code EG is for an L78 with manual transmission
• 3855962 is the block casting number for 375 hp
• 3873858 is for the cylinder heads, square port.
• 3855069 is for the aluminum intake manifold.
• 3856284 is the water pump, same as other 396,s
• 3883999 is the left exhaust manifold
• 3868874 is the right exhaust manifold

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