Overall, it’s a reliable engine with stout performance and sound. The 5.7 HEMI remains much the same today, however, it did go through updates to improve power and fuel efficiency. It’s a long-running pushrod engine that debuted with 345 horsepower in the 2003 Dodge Ram. I'm thinking that combo would put out maybe 300-325 hp and a 5.3 LS with just a cam and tune could easily put out more and get better gas milage.The Dodge 5.7L HEMI engine is also commonly referred to as the 345 HEMI in honor of its 345 cubic inch displacement. A new intake ($300) and I would have to prob upgrade my injectors But then to tune it I would have to spend another $300ish. I could get by with my crank and rods but would need new pistons and all new gaskets.
Also I've read into the heads and I'm better off with vortec heads and those are around $250-300 for a used set, then having to rebuild them. Without opening my engine I already know I need more compression (something around 10:1) to really take advantage of a better cam (if I converted to a roller cam it would be a comp XFI and would be around a $500 conversion plus springs). What I have come up with it really is cheaper to rewire a harness and swap in a 5.3 LS engine than rebuild my L05 TBI engine. I have been weighing my options on a 5.3 LS swap or intake, roller cam, some head work on my stock TBI engine. So I hate to say it but the LS engine might just be a gift from the engine Gods I'm thinking that combo would put out maybe 300-325 hp and a 5.3 LS with just a cam and tune could easily put out more and get better gas milage.
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