LT1-LT4 Modifications 1993-97 Gen II Small Block V8

24x Timing

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Old Feb 19, 2023 | 05:55 PM
  #21  
Fast355's Avatar
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Originally Posted by RGSS
I run an Efi Conn 24X in my 396 LT1 swapped ´82 El Camino
I think I have been running too much timing according to the tables submitted. Glad this was posted. I will give it a try.
It really depends on the setup. I have seen LT1 builds want as much as 38* on pump gas at 12:1 compression.

I am sure my 383 would want more timing on pump gas if it were not pulling around a 7,000 lbs Express van with a 4L85E and only a 3.73 gear. 6L90E swap coming soon though. I bet it wants a little more timing when the engine is not under as much load.
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Old Feb 27, 2023 | 08:06 AM
  #22  
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Originally Posted by Fast355
It really depends on the setup. I have seen LT1 builds want as much as 38* on pump gas at 12:1 compression.

I am sure my 383 would want more timing on pump gas if it were not pulling around a 7,000 lbs Express van with a 4L85E and only a 3.73 gear. 6L90E swap coming soon though. I bet it wants a little more timing when the engine is not under as much load.
Agreed. Mine sees between 38-40 on E85 with 12.7:1. Probably isn't gaining much at 40 compared to 38 but the plugs still look good.
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Old Mar 1, 2023 | 12:49 PM
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I’ve NEVER seen an lt1 engine want less then 30 degrees at WOT even with 11.5 CR or more.. these old school design heads need timing
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Old Mar 1, 2023 | 09:12 PM
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Originally Posted by T/A KID
I’ve NEVER seen an lt1 engine want less then 30 degrees at WOT even with 11.5 CR or more.. these old school design heads need timing
Typically 34-38 is where I see LT1s and LT4s make peak power. I have seen a couple that are knock limited to around 32-34, but that is not the normal. One of the knock limiteds was an iron headed LT1 in an 85 Suburban. The other was an aluminum head 383 in a heavy Fleetwood.
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