Stock 5.7L Max Boost Level?

Most Forced Air for Stock 5.7L 345 V8 Hemi bottom end

Most Boost (forced air) on Stock 5.7L V8

The common question for 5.7L V8 Hemi owners is how much boost can you run with a supercharger or turbo system on a stock bottom end of a V8 Hemi? In this video you will see a Youtuber by the name of Modern Red Hemi is running 15lbs of boost on a stock bottom end in his Challenger R/T Shaker 5.7L V8 Hemi. Keep in mind this Youtuber also has a handful of other upgrades that include upgrade camshaft, larger injectors, dual pump & e85 fueling.

This does however show you don’t need to pull the entire engine apart if you would like to run more than 6-7lbs of boost on a V8 hemi. The right tuner and fueling seems to be the magic formula to HP/Torque gains. The issue with running this kind of power in an R/T is the hp70 transmission which is usually maxed out at 600 lb-ft of torque.

The 5.7L 345 V8 Hemi is a great engine if you’re looking to add boost (supercharger or turbo). It can make a lot of power with fairly low boost levels, the key though is making sure to select the right tuner. Most mopar tuners choose to keep the Hemi at a very safe 6 or 7 lbs of boost on pump gas, this is to make sure the pistons & rods remain strong.

Modern Red Hemi gave his tuner “EFI Specialties” (one of the best Hemi tuners in the business) the green light to max out the stock bottom end. There is a chance that the stock 5.7L will run into issues drag racing each weekend, whether it’s transmission or the stock engine finally giving up. He has a plan though! Make sure to check out his Youtube Channel to keep up to date on his build.

Procharged 5.7L V8 or Hellcat 6.2L Build?

Will the stock 5.7L V8 Hemi be ok if higher boost is added? I think this is a great example of how you can run higher boost without having any issues. The full list of upgrades to this Challenger Shaker 5.7L is listed in the video & it’s very impressive. Shows you can really make the 5.7L very fast, but you must select the proper tuner to pull it off.