Use whatever oil you plan on using for the life of the engine keeping in mind the climate you live in. A 10W-30 or 5W-30 should be fine in an average climate.
about $2000
mortec.com
New? Rebuilt? Used?
Timing chains are designed to last the life of the engine and are replaced when the engine is rebuilt.
eBay offers a 454 Chevy Engine Rebuild Kit. It costs $379. It has all the necessary parts to rebuilt one's own engine. The engine was used in the 1970 Chevy Corvette LS5.
The recommended oil type for a 1973 Chevy 454 engine is 10w-30. This provides a good balance of lubrication and viscosity.
Timing chains are designed to last the life of the engine and are normally replaced when the engine is rebuilt.
5w-30
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Timing chains should last the life of the engine and are normally replaced when the engine is rebuilt.
250,000kms
10w-40.