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Thought I would post some pics for reference. Running a Silverado manifold on the left side, made my own adapter. Looked at putting it high behind the wheel, but too much tube and bracing from the engine.
Here's the right side, waste gate is not installed yet. Using an F-body double wall steel manifold. The L bracket is just there to hold it up. Will require bracing from the engine.
Last edited by squared; Sep 28, 2019 at 05:54 PM.
Reason: autocorrect
Turbos were hanging too low, so I cut the flange off the truck manifold on the left side. Welded a T25 flange on, which raises it significantly, and puts it above the oil level in the pan.
The turbo has an internal waste gate, was planning using externals.
I'm debating whether to drill a hole in the manifold and weld in a sched 40 pipe for an external, or just run it with the internal and see what the pressure inside the manifold is and if I get boost creep.
That's funny.... I've got a set of these in my storage shed from the 4.8 I put in my Wellcraft a few years back. They're cheap, much cheaper than any marine manifold that fits an LS. I opted to go with aluminum manifolds and risers from Marine Power at $1400.
I had the same thought... "why don't I just try to adapt those pleasurecraft marine manifolds?" They're cast iron and weigh a ton, easily twice what a cast manifold from a Silverado weighs. They do look like they would flow well. I'm not sure how the heat from a Turbo installation would affect them, since they're designed for cooling water. You might be able to vent them somehow. They're made to sit with the exhaust pointing up and mounting them upside down would be an issue.
LS1 with two GT2871s
