As I told you, I received my DOAE-9425-L intake manifold, with intake passage axle spacings which are identical to those of my future 4777-7, 4150, cfm650 HOLLEY carburetor. But my problem is that on my carburetor I have 4 diameters with a value of 42.5 mm, while on my manifiold intake I have 2 diameters at 42 mmm and the other 2 diameters at 38.5 mm , mensionned green circled !!!!!!! (see the dimensions of the carburetor in black color and the dimensions of the intake manifold in red color in the 2 attached photos).
Can be machined using a milling machine, should I enlarge these 2 diameters from 38.5 mm to 42 mm ????
On the other hand there is a groove that I circled in red on one of the 2 photos, what is its function? Will this match with my carburetor? If not what should you do?
Last question where can I find seals, the one between the carb. / intake and the one the intake / engine body?
Thanks for your help