410 LA small block will not rev past 6000
I’m going with it being a lifter issue.
When the power curve falls off a cliff and the engine runs into the wall………it’s never the flow capability of the heads.
Here’s a 410” pump gas street engine.
10:1, rpm heads with minor bowl and pinch work(flow 265-ish).
Held the power well past its 5900 peak, and finally dropped off when the rev limiter kicked in.
Without the rev limiter intervening, with the lobes that were used on that cam, the curve wouldn’t likely have nosed over until the springs allowed the valvetrain to get out of control, which should have been close to 7k.
Sure, the power would be tapering off before 7k, but that’s not the same as what I’m seeing with the OP’s graph.
I’m going with it being a lifter issue.
When the power curve falls off a cliff and the engine runs into the wall………it’s never the flow capability of the heads.
Here’s a 410” pump gas street engine.
10:1, rpm heads with minor bowl and pinch work(flow 265-ish).
Held the power well past its 5900 peak, and finally dropped off when the rev limiter kicked in.
Without the rev limiter intervening, with the lobes that were used on that cam, the curve wouldn’t likely have nosed over until the springs allowed the valvetrain to get out of control, which should have been close to 7k.
Sure, the power would be tapering off before 7k, but that’s not the same as what I’m seeing with the OP’s graph.