Originally Posted by gmc1990rodder
...the suffix numbers/codes on the front of the block are T0414CKP...
- '72 400cid, Impala, 170 HP, RPO LF-6, TH400 w/2-Brl carb.
Maybe someone knows the factory torque rating for it- I have Chevrolet manuals but they're either newer or older than '72. The factory ratings started taking a hit in '71 w/the lower CR, etc. required by the fedgov, and how the power ratings were figured changed from gross to net- which made the '72-up engines look 'weaker'.
Bottom line is it really doesn't matter what it HAD, it can make 400-plus ft/lbs w/relative ease.