Question to anyone who has a W115 intake manifold. What are the ID/OD of the runners (approximately) and how long are they? working on fabricating something similar using an old turbo manifold just need an idea.

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1985 300D om617: 8mm M pump 175cc 5200rpm, holset he221w @ 30psi, large A2W ic, compounds on the way.
KD9AFT
A&P