The torque specification for the main cap bolts of a Big Block Mopar V8 engine can vary depending on the specific model and year of the engine. However, as a general guideline, here are the torque specifications for a few popular Big Block Mopar V8 engines:

- 383/400/440 engines: 85 ft-lbs
- Hemi engines: 135 ft-lbs

It's important to note that these are general guidelines, and you should always refer to the manufacturer's specifications or a reliable repair manual for the specific torque specifications for your particular engine. Additionally, it's recommended to use a calibrated torque wrench and follow proper torque sequence when tightening the main cap bolts.
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