Matt, Both engines ran the Comp Cams .557" lift street roller (23-742-9) is the part number. I love seeing the real world numbers for flow on these heads. They confirm what I thought was the case. Does anyone have flow numbers for 906/452 heads, ported with large valves? It would be nice as a comparison.
Sorry, .575" lift roller, not the .557 i had written above.
