EngineMasters Episode 21 408/410 stroker w/ported heads

yellow rose said

This is typical.

First, they changes the intake and didn't make the carb smaller (like they should have) and they should have changed the cam. It's a system.

On the ported heads, they used an offset rocker. For all the bullcrap work they did, they could have done a W-2 and been better off.

Now I need to watch the rest of it.

Click to expand...

I assume you're talking the dual plane 408 vs the single plane 410? I think you're right and that's not a fair comparison.

But I do like the swapping the heads on the 410. It's interesting to see how much power you pick up when you change only one thing. Yes you can change other stuff to "optimize" the combo. But a lot of the time guys just put ported heads on their existing setup and go from there. And I think this really does show what happens with heads that are ported on a combo that can actually use them. That short block obviously works a lot better with ported heads. 92 horsepower gain is nothing to sneeze at. Can you do more with different heads? Obviously. But that wasn't the point of this test was it?

What I would have liked to see is the RPM air gap ported with the ported heads. I mean they are shutting it off at 7,000 rpm. The RPM air gap should pull to that. I bet it would go just as hard as the Victor. And have better numbers down low.