Cast vs. Aluminum heads and bang for buck..

j par said

I'm going to go ahead and dispute your flow numbers as well. I'm going to say these untouched Speedmaster heads would flow better...

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Heads are like cams. You can dump a .557 lift and 320 duration cam in a stock 318. It's not what's best. Treat heads the same, match the build and components. This is why this thread is SO generic it's silly.