more numbers help please

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JChlupsa · #1 12-05-2008, 12:05 PM

whats the block casting number?

**Carleen** · #2 12-06-2008, 04:49 AM

Look here.
http://www.nastyz28.com/chevy-engine-code-stampings.php

jeff morocco · #3 12-16-2008, 11:12 PM

here is the casting number

3935439..........date 6 14 68

but i still cant find anything on the BY suffix....possibly a marine block because it did have a 2 gear geardrive in it which would make the cam spin backwards for more torque in a boat ?? make sense to anyone ???

JohnZ · #4 12-16-2008, 11:57 PM

The only 3-character suffixes I've seen that start with a number are marine or industrial engines; sounds like a reverse-rotation marine engine.

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