Which head/combustion chamber is better for performance? Speed master aluminum LA or aftermarket magnum iron head?

I like the idea of a 451 or 470 BBM stroker, but I have never seen a SBM over 450 cubic inches. Your response reminds me of the guys I worked with whom would die on the hill of technically quoting documentation in arguments. You are absolutely correct on max effort, but I didn’t spell out ‘typical’ max effort on FABO here-doesn’t matter, you made a point.

As for a tow truck cast iron heads for stock stroke, and if you stroked the motor to the 408/410 .030”/.040” maybe the speedmaster heads.

I have a bunch of LA blocks, but if you don’t have a block, go magnum, with roller Magnum Valvetrain and never look back for your towing application.

volaredon said

Different variation on this question
What head would be better for a work truck, that is also an occasional tow pig?
Full bed to capacity about half the time, daily driver all the time? .
Assume the short block to be built up the same, only with different choices of heads to top it.
I'm thinking iron.

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