Battery Cable to Starter?
"Somebody" was bitchin on this board that "you can't get a simple answer." Well this is a GREAT example.
1...Trunk or front mount battery? You would not likely get away with 4ga to the trunk
2....What engine? A high compression B/RB/ hemi is not gonna like little wire
3....Old school Mopar starter or moderm mini/ permanent magnet? Modern starters draw WAY less current than the old original "wound field" starters
If this is a simple front mount battery / average 318/360 street engine, 4ga would work fine, but for very little more money you can buy larger cable, and I would