Ram Pentastar Specs: 3.78 x 3.268 in

Ram Pentastar specs: 3.78 x 3.268 in (96 x 83 mm) bore and stroke, shared by all 4 versions. Displacement, compression and factory ratings, plus rod ratio.

At a glance

Displacement	220 ci
Cylinders	6
Bore	3.780"
Stroke	3.268"
Compression	10.2–11.3:1
Advertised power	292–305 hp
Years	2011–2026

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
ERB	220 ci	3.7795" × 3.2677"	10.2:1	305
Pentastar · 3.780" × 3.268" · 11.3:1	220 ci	3.7795" × 3.2677"	11.3:1	305
ERB	220 ci	3.7795" × 3.2677"	—	292–305
Pentastar (2013–2026)	220 ci	3.7795" × 3.2677"	—	305

Factory cars with a Pentastar

• Dodge Challenger: 2011, ERB, 305 hp; 2012, ERB, 305 hp; 2013, ERB, 305 hp; 2014, ERB, 305 hp; 2015, ERB, 305 hp; 2016, ERB, 305 hp; 2017, ERB, 305 hp; 2018, ERB, 305 hp; 2019, ERB, 305 hp; 2020, ERB, 303 hp; 2021, ERB, 303 hp; 2022, ERB, 303 hp; 2023, ERB, 303 hp
• Dodge Charger: 2011, ERB, 292 hp; 2012, ERB, 292 hp; 2013, ERB, 292 hp; 2013, ERB, 300 hp; 2014, ERB, 292 hp; 2014, ERB, 300 hp; 2015, ERB, 292 hp; 2015, ERB, 300 hp; 2016, ERB, 292 hp; 2016, ERB, 300 hp; 2017, ERB, 292 hp; 2017, ERB, 300 hp; 2018, ERB, 292 hp; 2018, ERB, 300 hp; 2019, ERB, 292 hp; 2019, ERB, 300 hp; 2020, ERB, 292 hp; 2020, ERB, 300 hp; 2021, ERB, 292 hp; 2021, ERB, 300 hp; 2022, ERB, 292 hp; 2022, ERB, 300 hp; 2023, ERB, 292 hp; 2023, ERB, 300 hp
• Ram 1500: 2013, 305 hp; 2014, 305 hp; 2015, 305 hp; 2016, 305 hp; 2017, 305 hp; 2018, 305 hp; 2019, 305 hp; 2020, 305 hp; 2021, 305 hp; 2022, 305 hp; 2023, 305 hp; 2024, 305 hp; 2025, 305 hp; 2026, 305 hp

What varies across the family

All are oversquare — bore larger than stroke, which favours revs over low-end torque.

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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