Toyota 346ci Specs: 94 x 102 mm

Toyota 346ci specs: 94 x 102 mm (3.7008 x 4.0157 in) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.

At a glance

Displacement	346 ci
Cylinders	8
Bore	3.701"
Stroke	4.016"
Advertised power	381 hp
Years	2007–2021

This engine

Engine	Displacement	Bore × Stroke	CR	HP
3UR-FE	346 ci	3.7008" × 4.0157"	—	381

Factory cars with a Toyota 346ci

• Toyota Tundra: 2007, 381 hp; 2008, 381 hp; 2009, 381 hp; 2010, 381 hp; 2011, 381 hp; 2012, 381 hp; 2013, 381 hp; 2014, 381 hp; 2015, 381 hp; 2016, 381 hp; 2017, 381 hp; 2018, 381 hp; 2019, 381 hp; 2020, 381 hp; 2021, 381 hp
• Toyota Land Cruiser: 2008, 381 hp; 2009, 381 hp; 2010, 381 hp; 2011, 381 hp; 2013, 381 hp; 2014, 381 hp; 2015, 381 hp; 2016, 381 hp; 2017, 381 hp; 2018, 381 hp; 2019, 381 hp; 2020, 381 hp; 2021, 381 hp

What varies across the family

This family is represented by a single engine in the database: 346 ci, 8 cylinders, a 3.7008" × 4.0157" bore and stroke.

All are undersquare — stroke larger than bore, favouring torque low in the range.

Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.

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