14-03-2019, 08:33 PM
For what it's worth, I've made a few manifolds over the years, bends like the shallow curve on your inlet stub pipes are easily cut out of longer curved sections, the trick is getting both to be even which I generally do by building the manifold on a spare head to get the proportions right, and tack weld it together before transferring it to a thick steel plate for final welding
Aye
Greig
Aye
Greig