Intake and exhaust manifolds:
If you look at the 300 intake and exhaust manifolds you will notice they are held up against the head with a thick washer under a bolt that straddles both manifold tabs. It is a poor arrangement and there are times when the tabs crack or break when the bolts are tightened extra to fix an exhaust or intake leak.
Since you do not want a cold intake manifold and don't care about keeping the intake and exhaust flanges isolated from each other it would be a great improvement to have both the intake and exhaust manifolds on a common thick flange with holes for studs or bolts instead of flimsy tabs.
There is a concern about having enough heat in the exhaust manifold during light engine loads.
One of the problems with a simple log manifold is only half the heat from all six cylinders would be applied to the heat exchanger tube going through the manifold by virtue of the exhaust runner locations along the log. If the turbo is at the front, all of the exhaust from cylinder 6 runs across the tube but almost none of the exhaust from cylinder 1 and varying exposure with respect to location from cylinders 2-5
Ideally all six exhaust runners enter one side of the log and exit out the other end to the turbo.
Another advantage of having longer runners between the exhaust ports and the log is a reduction in engine pumping losses and better intake port induction.
We can talk about this in length later if you want. It is also part of the cam profile conversation.
If you look at the 300 intake and exhaust manifolds you will notice they are held up against the head with a thick washer under a bolt that straddles both manifold tabs. It is a poor arrangement and there are times when the tabs crack or break when the bolts are tightened extra to fix an exhaust or intake leak.
Since you do not want a cold intake manifold and don't care about keeping the intake and exhaust flanges isolated from each other it would be a great improvement to have both the intake and exhaust manifolds on a common thick flange with holes for studs or bolts instead of flimsy tabs.
There is a concern about having enough heat in the exhaust manifold during light engine loads.
One of the problems with a simple log manifold is only half the heat from all six cylinders would be applied to the heat exchanger tube going through the manifold by virtue of the exhaust runner locations along the log. If the turbo is at the front, all of the exhaust from cylinder 6 runs across the tube but almost none of the exhaust from cylinder 1 and varying exposure with respect to location from cylinders 2-5
Ideally all six exhaust runners enter one side of the log and exit out the other end to the turbo.
Another advantage of having longer runners between the exhaust ports and the log is a reduction in engine pumping losses and better intake port induction.
We can talk about this in length later if you want. It is also part of the cam profile conversation.