More HP from 5.9 Magnum

Woods74 said

No need to be a dick, big dog.

How do you get around the beer barrel intake RPM range? How do you magically make the anemic stock injectors roll more GPH? Throttle body CFM issues? These problems haven't changed since 2008. Maybe they we're made up issues? It would be great to make it all work like you say.

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Sorry if that sounded dickish, it wasnt meant to be. The thread is total **** though as most of the info is pure crap. The stock manifold does not stop pulling at 3500, hughes tested it and it made the same or more hp and torque than Edelbrock AG up to 4000 and then does taper off, done at 5000. If the OP wants to run above 4500 for extended periods I would recommend an Edelbrock AG FI or one of the Edelbrock Pro Flow Intakes. The crap about fuel cutting at 5000 is wrong, pcm has rev limiter that retards timing at 6500(some flashes are higher), but no ability to cut fuel and I have revved many to 6000 just fine. That can be raised with flash too.

You can buy a set of 24# injectors cheap but the stock ones(red 5.9 best) will work to 350+, well above OP's target HP.

Stock TB flows 700+ cfm at 25"H20 and a modified one flows 800+ or the Hughes big Gulp flows 1000+ cfm.

You can get easy 450 HP daily street driver and over 500 HP for strip use. It will require some additional pcm help but there are plenty of dyno runs documenting this.

There are a lot of kids in their moms basement that try and pass for engine builders or race guys, just remember, its the internet. I would not have been in business for 20 + years if I couldnt get more than 300 HP out of a magnum with factory injection. We are building a 5.2 for a customer right now that is running stock 5.9 injectors and keg manifold that will easily make 350 if not closer to 375. Good heads and a very aggressive roller cam with Multi Port and pcm flash would surprise you.