408, Small or Big Block? Need EGT Info

Small block pictures below...
738E3A39-2A0A-4F32-8BF6-6E03ABA8293E.jpeg B715009D-3D24-436E-81D5-463240368086.jpeg 9EB40A1A-8B19-4BD5-9079-885B0A928528.jpeg 85843029-C558-4D2C-AB6B-D8A8679D9DAE.jpeg

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