- four bolt mains
- A term referring to the number of bolts needed to secure the each cap to a crankshaft rod. Most engines come with two bolt main; but racing engines have four.
Dictionary of automotive terms. 2015.
four bolt mains
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bolt mains — See four bolt mains … Dictionary of automotive terms
4-Bolt Mains — A 4 bolt main refers to the number of bolts attaching the main bearing caps to the block of an internal combustion engine. Four bolt mains are considered much stronger for high performance use than a 2 bolt main. Using 4 bolts to secure the main… … Wikipedia
bolt — A securing device upon which a nut is threaded. It usually has a nut type head. It is usually measured not so much by the size of the wrench required to secure the bolt; but by the diameter of the threads, the thread pitch, the length of the bolt … Dictionary of automotive terms
mains — See four bolt mains … Dictionary of automotive terms
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