This block has these numbers:
Right side below head on block deck
T1 25CPB 16R440611 (stamped in numbers)
Rear of block left side below head:
355909 (cast numbers)

only thing i can find is the Casting # 355909 that is a 1975 262 C.I. 110hp 2bolt main block or could also be a 1976 to 1985 305 C.I.

The CPB i couldnt find.

1976 305

T1 25CPB is the engine application code
T - Tonawanda Engine plant
1? - Month
25 - Day
CPB - 1976 305-140 hp RPO LG3 2 bbl carb used in a Chevelle

16R440611 is the VIN derivative and tells us the car this engine was factory installed in
1 - Chevrolet Division
6 - Model year is 1976
R - Final assembly in Arlington Texas
440611 - Production sequence number, last 6 digits of cars VIN.

Wow!! That was fast!! Thanks for the info!!

Still working on this quest for an engine!!

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