[2.7RACER]

Damion,
The above numbers are wrong. Sorry, I just measured the center to center of my 2.7 intake and got 118.4 mm. I'll get you the angle once I have it figured out.

118.4 mm is center to center of adjacent cylinders.
You asked about center to center across the motor.

It pays to read the question and understand it. My bad.

I measured across studs at cylinder 2 to cylinder 5 and got 19-5/16". The case vent interfered with a 3-6 measurement.
1-4 measured the same 19-5/16". This is an angle since these cylinders are offset from each other.

19-5/16" is a center to center dimension of the intake ports.

Measuring 90 degrees from the case centerline to the nearest stud was 8-1/4"
This is not center to center, it is case centerline to the inside stud edge.
To get the center from the case centerline add 1/2 the stud dia. plus 1/2 the height of the triangle formed by the stud angle. S/B (1/2 (7.3mm + 59.6mm))=33.45mm.
33.45mm = 1-5/16" plus 8-1/4"= 9-9/16" from case centerline to intake center.

Bottom line the relationships are all angles due to the offset of the cylinders to each other.

My calculations checked two ways for the angle of the intake studs was 64.6 degrees from the case centerline.

I would lay all this out carefully and then build to fit the layout.
Too many angles and conversions.