I have had the unique experiance of seeing the ports while intake is bolted to heads,,,,,, with lower manifolds bolted on.... manifold cut away for inverted and on all six manifolds there is a big mismatch,,,,, on the single runners of manifold the two side by side are ok .....just need port match but the two single runners are way off..... one i have to weld in and re port its almost 1/8 inch off,, they are the front driverside and rear pass side
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