OE magnum heads versus speedmaster LA heads

[HankRearden]

I'm curious has anyone compared stock magnum heads to "as cast" speedmaster LA heads on a flow bench?

 

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Here Edelbrock vs SM vs 360

SBM Edelbrock/Speedmaster Head Data

Here's magnum vs j heads

 

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Go to Charles Servedio cylinder head porting & flowbench search Chrysler there's various stages of most these heads ported too.