Ram Hemi Engine Specs

Bore, stroke, displacement and compression for all 10 Ram Hemi engines, compared side by side. Plus rod ratio and head specs where published.

At a glance

Displacement	345–392 ci
Cylinders	8
Bore	3.917–4.091"
Stroke	3.579–3.724"
Compression	9.5–10.5:1
Advertised power	340–702 hp
Years	2003–2026

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
64 Hemi Apache	392 ci	4.0906" × 3.7244"	10:1	410
ESG	392 ci	4.0906" × 3.7244"	—	470–485
Hemi 6.4	392 ci	4.0906" × 3.7244"	—	405–410
Hellcat	376 ci	4.0906" × 3.5787"	9.5:1	702
Hemi · 3.917" × 3.579" · 10.5:1	345 ci	3.9173" × 3.5787"	10.5:1	345–395
EZB	345 ci	3.9173" × 3.5787"	—	340–376
EZH	345 ci	3.9173" × 3.5787"	—	370–376
Hemi 5.7	345 ci	3.9173" × 3.5787"	—	345–383
Hemi (2009–2026)	345 ci	3.9173" × 3.5787"	—	390–395
Hemi 5.7 CNG	345 ci	3.9173" × 3.5787"	—	383

Factory cars with a Hemi

• Ram 1500: 2003, 345 hp; 2004, 345 hp; 2005, 345 hp; 2006, 345 hp; 2007, 345 hp; 2008, 345 hp; 2009, 390 hp; 2010, 390 hp; 2011, 390 hp; 2012, 390 hp; 2013, 395 hp; 2014, 395 hp; 2015, 395 hp; 2016, 395 hp; 2017, 395 hp; 2018, 395 hp; 2019, 395 hp; 2020, 395 hp; 2021, 395 hp; 2022, 395 hp; 2023, 395 hp; 2024, 395 hp; 2026, 395 hp
• Ram 2500 and 3500: 2003, 345 hp; 2004, 345 hp; 2005, 345 hp; 2006; 2007; 2008; 2009, 355 hp; 2010, 383 hp; 2011, 383 hp; 2012, 383 hp; 2013, 383 hp; 2014, 383 hp; 2014, 410 hp; 2015, 383 hp; 2015, 410 hp; 2016, 383 hp; 2016, 410 hp; 2017, 383 hp; 2017, 410 hp; 2018, 383 hp; 2018, 410 hp; 2019, 410 hp; 2020, 410 hp; 2021, 410 hp; 2022, 410 hp; 2023, 410 hp; 2024, 410 hp; 2025, 405 hp; 2026, 405 hp
• Dodge Charger: 2006, EZB, 340 hp; 2006, EZB, 350 hp; 2007, EZB, 340 hp; 2007, EZB, 350 hp; 2008, EZB, 340 hp; 2008, EZB, 350 hp; 2011, EZH, 370 hp; 2012, EZH, 370 hp; 2012, ESG, 470 hp; 2013, EZH, 370 hp; 2013, ESG, 470 hp; 2014, EZH, 370 hp; 2014, ESG, 470 hp; 2015, EZH, 370 hp; 2015, ESG, 485 hp; 2016, EZH, 370 hp; 2016, ESG, 485 hp; 2017, EZH, 370 hp; 2017, ESG, 485 hp; 2018, EZH, 370 hp; 2018, ESG, 485 hp; 2019, EZH, 370 hp; 2019, ESG, 485 hp; 2020, EZH, 370 hp; 2020, ESG, 485 hp; 2021, EZH, 370 hp; 2021, ESG, 485 hp; 2022, EZH, 370 hp; 2022, ESG, 485 hp; 2023, EZH, 370 hp; 2023, ESG, 485 hp
• Dodge Challenger: 2009, EZB, 376 hp; 2010, EZB, 376 hp; 2011, EZH, 376 hp; 2011, ESG, 470 hp; 2012, EZH, 375 hp; 2012, ESG, 470 hp; 2013, EZH, 375 hp; 2013, ESG, 470 hp; 2014, EZH, 375 hp; 2014, ESG, 470 hp; 2015, EZH, 375 hp; 2015, ESG, 485 hp; 2016, EZH, 375 hp; 2016, ESG, 485 hp; 2017, EZH, 375 hp; 2017, ESG, 485 hp; 2018, EZH, 375 hp; 2018, ESG, 485 hp; 2019, EZH, 375 hp; 2019, ESG, 485 hp; 2020, EZH, 375 hp; 2020, ESG, 485 hp; 2021, EZH, 375 hp; 2021, ESG, 485 hp; 2022, EZH, 375 hp; 2022, ESG, 485 hp; 2023, EZH, 375 hp; 2023, ESG, 485 hp

What varies across the family

Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.

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.

← All Ram engines