E-street vs Promaxx vs 440 Source

Swingn’71 said

I would go with all except source having the same casting. Freeze plug, straight spark plug etc. probably close but not exact.Swingn’……

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I ve got pro max /rpm / indy /tf240s all tk racers.All heads must go to a machine shop when you buy em.trick f s are the bargain but don’t bolt them on
This is a race forum None of your heads in ? are good for over 451 cubes anyhow
Most street cars aren’t any count over 600 horse not to mention most of u guys have a mess under your vcovers