What does the expression means by 3 bolt main?

Question:
what do they mean when they say 3, 4 bolt main on engines?

Answers:

1977 Porche has 3,000 miles but hasn't run in 20 years. What am Iooking at to fix.?

Never heard of a 3 bolt main, however, 4 bolt means the number of bolts in the crankshaft bearing caps.

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Where is the fuel filter located in a Mazda Protege 1994?

it's how many bolts hold the main bearing caps on. 2 or 4 bolt per cap

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