Late 80's swirl port heads 302/714's

mbaird said

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I've found the open chambers make more power on a race motor, unshoruded valves and all that. Good to see back to back test with same valves and valve job procedure
I still like closed chamber on the street, truck, motorhome
they seem to take less timing and are less picky on the fuel
perhaps it's that the 360 heads are being run above the torque (BMEP) peak
I can't guarantee good gas

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Are you saying small block motorhome engines use closed chamber heads ?[/QUOTE]


I have never seen an open chambered head take more than 35 degrees total, unless something was FUBAR or the light was wrong (which happens more often than not...but most people don't check that stuff) and I've never seen a magnum head run any less than that.

They are essentially the exact same chamber and plug location. The difference is the quench pad.