Hellcat Supercharger on a 5.7L HEMI: Fitment, Adapter Kits, and What to Expect
The 5.7 HEMI is one of the most common Mopar V8s on the road, and yes — it can run a Hellcat supercharger. It's not a bolt-on swap, though. Here's what's actually involved.
Why the 5.7 Is a Common Target for the Swap
The 5.7 HEMI shares block architecture and bore spacing with the 6.2L Hellcat engine, which is part of why adapter kits exist to mount the Hellcat's IHI supercharger onto a 5.7 in the first place — the intake bolt pattern isn't a huge stretch. That family relationship is also why this swap shows up so often in the Challenger, Charger, and Ram community: a lot of 5.7 owners are one adapter kit away from serious power.
What the Swap Actually Requires
An adapter. Bridging the Hellcat supercharger's 6.2L mounting pattern to the 5.7's intake runners requires a purpose-built adapter — billet, port-matched to the 5.7, not a generic multi-application plate. Cast adapters are a known failure point under repeated boost and heat cycling.
Charge cooling. The Hellcat supercharger uses an integrated water-to-air charge cooler. That system has to be plumbed on a 5.7 install just as it would be on a 6.2L — a dedicated coolant loop with its own pump, heat exchanger, and reservoir, separate from the engine's cooling system. Skipping it lets inlet air temperatures climb quickly under boost.
Fueling. The factory 5.7 fuel system isn't sized for forced induction. How far you need to go — injectors, pump, lines — depends on your power target, and it's worth settling that with your tuner before you buy hardware.
Bottom-end reliability. The 5.7's factory internals weren't designed around boost. How much boost is reasonable on a given engine depends on its condition, mileage, and how it's driven — that's a call for a tuner or engine builder who can evaluate your specific motor, not a number we're going to print here as a blanket rule.
Tuning. A 5.7 running a positive-displacement blower needs a tune built around that combination — boost target, spark strategy, injector scaling, and knock protection. Look for a shop with documented experience on boosted HEMI platforms.
One Thing to Check Before You Commit
In Ram truck applications especially, the Hellcat supercharger package sits taller than the stock intake it replaces, which can affect hood clearance. Worth confirming before you order parts, not after.
Where FAS Fits In
If you're sourcing a used Hellcat supercharger for this swap, having it inspected and ported before it goes on the 5.7 is worth doing while it's off the vehicle. FAS's 2.4L/2.7L Hellcat snout porting and IHI supercharger rebuild services are built around this exact unit. We also port the 5.7's intake manifold directly — see our Hemi intake manifold porting (6.4L / 6.1L / 5.7L) service — which is worth considering alongside the supercharger swap since it addresses a separate restriction downstream.
Talk to Us Before You Order Parts
Adapter selection, charge cooling, fueling, and how much boost your specific engine can handle all depend on your build and budget — not a one-size answer. Contact FAS Motorsports to talk through your 5.7 swap, or read our Hellcat supercharger porting explained breakdown for more on what porting does and when it's worth it.
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