how to make a 6.1 spin safely 7500 rpms?

L4staero said

340 is good for boat anchor as they make 120hp less than a 6.1 as they left the factory.
How many passes would a stock 340 have lasted at 425hp?
Its 2017 now not 1973

Anyway valvetrain is fine to 7500rpm if lookig at the dragpak cars is anything to go by.....8000rpm onstock rockers

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The Hemi is a great engine.
But even though it a clean sheet of paper design. It's short block at its heart (rotation assembly) is basically LA.

5.7 is basically a 318 bore with 360 crank. And 6.1 340 with 360 crank. And hydraulic roller cams.

The big change for power and the main reason for redesigning the short block is the head package. But really a roller cam 318 with 3.58 crank and edlebrock rpm is equal to 5.7 hemi and roller cam 340 with 3.58 crank and edlebrock Victor heads is equal to 6.1/6.4 hemi. Except no MDS or VVT.

Plus a 425 hp 340 can last a long time and really is only a cam headers and intake away. My cousin runs one in his late model 3 season on last build hitting 7000 rpm plus
Stock rods and crank.