Turn to pump mods up to about 450hp. The real problem is the pump. They used 10mm plungers in most of them, and the 6BT got 12mm. You can run some wild power numbers with reliability, it's the driveability that suffers. Simply depends on what you're doing with it.
to further ID the engine, does it have the bolt-on intake manifold like a traditional 6cyl, or is it part of the valve cover(opening on the very top)?
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