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You could always call or email BTR. "Hey, I have these heads with these valves and these rockers and these springs at this installed height, it hits a wall at 6300-6400. We're trying to rule out a...

An intake manifold or other restriction won't do that though. Not even an elbow collapsing or something will make MAP higher. Pressure would continue to fall off with a restriction as engine speed...

MAP falls as expected with a not-up-to-par intake system right up until 6300, then when MAF/cylair take the nosedive MAP goes back up. Almost like something was being burped back up the intake ports.

The pressure sensor is often an expected/calculated/estimated value, not live and accurate. Yes, there is a real sensor there with 3 wires and everything and yes it does output an actual variable...

What rockers are they? Stud mount adjustable or pushrod seat adjustable? What's the thread pitch? 1-3/8 turns is a lot, depending on the pitch.

I always did hydraulic Gen 1 SBCs with only 1/2 turn...

Aftermarket rockers will need more spring to go to the same RPM as stock rockers. Heavier aftermarket valves will need more spring to go to the same RPM. There is no one-size-fits-all when there are...

Man, I wish they'd invent a way to verify fuel pressure with a keyboard, then I wouldn't have to spend so much time bitching at people for trying to do work on EFI without a gauge.

And the...

Well... did you look at the changes I put in your file? Tried it yet? --> https://forum.hptuners.com/showthread.php?109677-5-3-Turbo-Spark-and-Closed-Loop-issue&p=780297&viewfull=1#post780297

Injector data not correct. (I know, broken record... but it keeps being done wrong, I dunno man.)

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The table that was changed isn't used, the one that is used wasn't changed from stock...

What is the fuel pressure? How long does it hold pressure after key-off?

No Bosch O2s in GM vehicles, ever. GM/Delco, NTK, Denso only. No Amazon Marketplace.

If it has stock 2002 LS1 injectors why was the Injector Flow Rate table changed? What is the fuel pressure in...

Did you ever answer if it sounds like a rev limiter when it stops pulling? Sounds funny, goes flat, maybe some popping/banging? Or it just hangs at that RPM and sounds normal?

If the injectors are what the number on them claims, and you have a return/referenced fuel system, and it's at 58psi base, and it won't run with legit data... do you think the problem lies in the...

Misfires read lean at the O2 sensors. O2s do not measure unburned fuel, they measure oxygen.

https://forum.hptuners.com/showthread.php?107001-How-to-tell-case-ground-from-isolated-ground-O2s

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Since you just replaced the sensors I assume you've already worked out whether the harness is set up for case ground or isolated and made sure the new sensors match the harness?

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It sounds like it could be anything that causes an open circuit on both sensor signal wires. Only you can narrow it down from there, when I look in GM service manuals there's no diagrams for a '54...

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No closed loop because both your O2 sensors are flatlined at the bias voltage. They're either not plugged in, or wired wrong, or dead/broken.

In the editor, type CTRL+N. Type in '14000' or '12301'.

Explain how this is an intake manifold:

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MAP also increases right when it starts doing whatever is happening.

'54 Ford Customline - https://www.ebay.com/itm/266787507347

Kinda cool, would be a lot cooler if it was $3000 instead of $4500, it's someone's abandoned restoration project (bad, don't like...

Do the smart thing and buy a subscription at alldatadiy.com, that way you can get good diagrams for anything you end up with and don't need to limit yourself only to what's been put up online for...

...or an 8.1 base file, with the same firing order/injector bank changes. From what I can see in the service manuals the 8.1 reluctor is the same as the LS.

Where is your 1x cam sensor gonna be...