Big Cubes Big Power From All-Aluminum Gen II Hemi

[Bob Riebe]

https://www.motortrend.com/how-to/gen-2-hemi-engine-900-hp-valley-performance/?lid=dbqukeh7e0aj&eml=organic%3Aeml%3Abrz2&utm_source=braze&utm_medium=emaileditorial



In the end, the project netted out at 914 horsepower and 740 lb-ft of torque, with the all-alloy Hemi atomizing 110-octane through a single four-barrel carb on the engine dyno. Barna notes that they could have pushed the engine's output very close to that 1,000-horsepower threshold with a less streetable combination, but Honda Joe was also adamant about durability and drivability.

"We went a little conservative with things like the cam specs to help keep down the maximum rpm, but we also went over the top with areas such as the valvetrain, all to ensure a maintenance-free combination," says Barna. "That approach also helped the engine make more low-end grunt for a greater feeling of performance on the street."...

...In the end, the project netted out at 914 horsepower and 740 lb-ft of torque, with the all-alloy Hemi atomizing 110-octane through a single four-barrel carb on the engine dyno. Barna notes that they could have pushed the engine's output very close to that 1,000-horsepower threshold with a less streetable combination, but Honda Joe was also adamant about durability and drivability....

..."It's a 10,000-rpm valvetrain for a 7,000-rpm engine," said Barna. "It's a bit over the top, but again, the goal here was to make essentially maintenance-free big power."...

...All without forced induction, too. There's no denying the lure of the modern, supercharged Gen III Hemi, nor its unquestionable capability, but this project demonstrates there's still something to learn from the old school, as those original Hemi engineers knew a thing or two about airflow.

This project showed cubes, compression, and a carb can still win the day.

Dyno Chart
RPM Horsepower Torque (lb-ft)
4600 592 676
4700 616 688
4800 638 699
4900 664 712
5000 686 721
5100 704 725
5200 719 726
5300 735 728
5400 754 733
5500 770 735
5600 786 737
5700 803 740
5800 816 739
5900 826 735
6000 836 731
6100 845 727
6200 854 723
6300 864 720
6400 872 716
6500 882 713
6600 892 709
6700 900 706
6800 907 401
6900 912 694
7000 914 685
Sources

    ARP: arp-bolts.com
    Indy Cylinder Head: indyheads.com
    Molnar Technologies: molnartechnologies.com
    MSD Performance Products: holley.com
    Quick Fuel: holley.com
    Ray Barton Racing Engines: raybarton.com
    Valley Performance: www.valleyperformancellc.com
    Wiseco Performance Products: wiseco.com