Mopar Performance, Auburn Hills, MI
Of the two domestic manufacturers that faced bankruptcy two years ago, Chrysler was especially hard hit, and we could see it in the faces of the employees we’ve met since then. You know, that faraway, demoralized look and demeanor. They had good ideas and great products to bring to market, but they took a harsh beating in the press and needed to come out on the other side of Chapter 11 before introducing some of the products they knew people would want. We’re happy to see that Mopar Performance is on target with some impressive products recently unveiled at last year’s SEMA show. One of the standouts in this ready-to-run 426 Hemi crate engine. Who wouldn’t want nearly 600 hp under the hood of his or her new Challenger?
The Crate Package
Mopar Performance has previously offered a crate version of the 426 Gen III Hemi, but this package makes more power and is sold ready to run with an ECM and wiring harness. This block will accept any Gen III accessory drive and includes attachments for a front motor plate. By the way, 426 ci is accomplished by a 4.125-inch bore and 4.00-inch stroke. This block could be bored out to 4.155 inch and will accept a 4.125-inch crane. Those dimensions add up to 447 ci or 7.3 liters of Chevy-stomping power.
They are impressive. How does 0.639/0.628 inch of valve lift sound? Those figures look great on paper. We can’t wait to hear one of these engines running.
Ready to run implies install it and twist the key. Mopar is making it just that easy by including a calibration kit, which includes a throttle-body, a wiring harness, and an ECM. Ask for part number 5156139 at your favorite Mopar Performance dealer. Pricing is to be determined.
Stock rocker arms are used, but tie bars are added to stabilize the valvetrain at high rpm.
Yes, it will run on pump gas, as long as you aren’t pumping that gas from a station here in California. Mopar recommends 93-octane. Come on Cali, give us better gasoline than 91-octane.
Where the production SRT8 blocks are all cast iron, the foundation for this plant is aluminum and offers an impressive 100-pound weight advantage compared with the iron block. Inside, you will find a sturdy forged crankshaft supported by cross-bolted billet steel main caps. All new Hemis have cross-bolted caps, of course, but the second, third, and fourth main cap in this block have six bolts instead of the standard four. Forged H-beam rods support forged 11:1 pistons.