Re: CAN SOMEONE DECODE MY BIG BLOCK?
I'll bet it's a #3999289 block w/#336781 Heads.
I'm pretty sure that's a 1974 Impala 454/235HP engine.
They originally used a CXA suffix,but have been known to stamp the last digit of the model year instead on some examples at that time.
T=Tonawanda plant
09=Month Sept.
28=day
4=Model year,1974
Check the back of the block for a casting date and part No.,also the same for the Heads to confirm.
Your intake looks like a Marine application.
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