SM Head Modifications on a budget

PRH said

Something I find that can happen when you’re chasing the high lift flow by messing with the SSR is………you can reach a point where getting the floor shaped better for high lift flow, ends up costing you some flow in the low/mid-lift area of the curve.
Then you have to decide which way to lean for the particular application the heads will be used for.

I would agree with your assessment of the valve sinking as being a big player in the lesser low/mid-lift numbers on the two ports..

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As much as I hate to disagree with you on this I have to on this subject. I Dont think I gave up any thing high, mid, or low on this port. Sometimes I feel guilty telling guys not to aggressively lower the shortside on these heads because you have to. BUT and this is way I say it. You can mess up a port real bad if you Dont know the needed steps. I take caliper readings off my deck across the top of the shortside and have measurement’s for a 290cfm port, a 311-315 cfm port, and a 320 plus cfm port. You would be amazed at the shaping necessary.