Generation IV Internal Engine - Custom ITB setup / LS3 inlet port size widht/height ?

Could anyone measure what´s the size of LS3 inlet port, widht/height, and how far ports are from each other (center point)?

Wouldn´t want to take of my intake manifold for this wondering...

I have broken BMW M5 S62 V8 engine in my garage and it has 50mm ITB setup from standard. Couldn´t help of thinking if it should be fitted to my LS3, first problem is that in those throtle bodies inlet port shape is just the opposite than in LS3 heads wider vs height, but that could be solved with adapters. I have standalone engine management, so eletrical issues is no problem.

Good idea, but seeing pics of the M5 heads not gonna happen unless you make a custom lower manifold to match up the the M5 one at one end and the LS3 heads on the other end.

Good idea, but seeing pics of the M5 heads not gonna happen unless you make a custom lower manifold to match up the the M5 one at one end and the LS3 heads on the other end.


This is just what i had in mind, not a problem. 2-3 inc twist shape tubes between flanges.

But the size, So throtlee bodies are 50mm which should be enough, inlet on M5 head is 2" width, 1" height, and throtle bodies ofcourse match in those, you can port those little but not much, maybe to size 2 1/4 x 1 1/4, seems quite small comparing to LS3 ports by the pics i´ve seen.

Bump for size info

Still need this info.

Well, the bore centers are 4.4 inches apart, and since the ports seem to be mirrored hole to hole, I would try that number on for size.