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Max Displacement on 411 PCM?

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Old Dec 11, 2006 | 11:13 PM
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Default Max Displacement on 411 PCM?

There is a small group of us on the PPE forum working on installing 411 PCMs with the programming from L31 Savannahs. Besides the overcoming the limitations in RPM and available programmers, I am interested in knowing how much displacement these PCMs will handle.

The stock PCM on my truck only supports 1.0 liter per cylinder maximum, so it will support a 454, but not a 496, 502 and definately not a 572.

I know the 411 PCM supports a 496 (8.1L) so the limit must be higher than 1.0

At some point in the future I want a tall-deck bigblock under the hood but I prefer it running on a GM PCM.

Anybody know how big these PCMs will support?
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Old Dec 12, 2006 | 12:03 AM
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Originally Posted by James B.
There is a small group of us on the PPE forum working on installing 411 PCMs with the programming from L31 Savannahs. Besides the overcoming the limitations in RPM and available programmers, I am interested in knowing how much displacement these PCMs will handle.

The stock PCM on my truck only supports 1.0 liter per cylinder maximum, so it will support a 454, but not a 496, 502 and definately not a 572.

I know the 411 PCM supports a 496 (8.1L) so the limit must be higher than 1.0

At some point in the future I want a tall-deck bigblock under the hood but I prefer it running on a GM PCM.

Anybody know how big these PCMs will support?
They'll support up to 1.6L/cylinder.
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Old Dec 12, 2006 | 12:40 AM
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Thanks! Looks like it would do the job with plenty of room to spare.
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Old Dec 19, 2006 | 06:57 PM
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I want a 12.8L!!
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Old Dec 20, 2006 | 12:59 AM
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Originally Posted by Tahoe6.0
I want a 12.8L!!
Funny you should mention that because the V16 Caddy motor is somewhere around there.
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