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Also I wouldn't stress about it to much. Have a look at where the intake pipe is on the standard inlet manifold. Then see where your lower numbers are....
The higher numbers must have some carbon build up fudging the numbers a little as with the standard intake those cylinders are not getting enough air for a complete burn and will hence build more carbon than the 3 near the intake manifold inlet. Just my educated opinion though .
Last edited by nissannewby; 19th June 2021 at 11:24 PM.