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Old 09-16-2010, 07:39 PM
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454 swap to a 8.1L

i have a 454 in my 95 C3500 dully wanting to know if the swap will be better. I have access to an 8.1L vortex out of a 2007 2500HD truck. the motor has low miles and has a blown head gasket. warranty people just put a new motor in the truck being it was under warranty. Instead of having to get a new computer and wiring harness for my truck to swap it, I was going to go the rout of getting rid of the fuel injection system and turning it over to a carb set up, putting a MSD ignition set up on it. But will my headers off my 454 interchange along with my transmission? I know the 8.1L takes an Allison transmission.


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Old 09-17-2010, 02:22 PM
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A little info

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Old 09-17-2010, 06:07 PM
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The transmission should bolt up, but i'm not 100% sure. You will need either different headers or the 8.1 manifolds. The 454 heads and the ls engine heads are completely different and your current headers won't work. Running a carb and msd ignition control box is a good idea in my opinion, it simplifies the swap and it easier to work on. Good luck
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Old 09-17-2010, 07:00 PM
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Also your front mount accessories will not directly bolt on. The 8.1 has no harmonic balancer. Just a serpentine belt pulley pressed onto the crank.

Only carb intakes are HIGH dollar units. No previous BBC intakes or heads will fit 8.1
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Old 09-19-2010, 08:14 AM
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454 swap to a 8.1L

ya i figured my headers wouldn't work. i get horrible gas mileage with my 454. i wanted to do a swap to hopefully help the truck out. the reason why i wanted to transfer the 8.1 to a carb. is because i want to avoid the wiring harness and the computer. i would probably have a hard time finding them and i know the dealer will want an arm and leg. when i read about the 8.1 i read that the newer 8.1 you cant transfer the motor to a carb. i believe i found a intake but it was $3,000.00. think its going to be a good idea to even do the swap. what will be the positive out come out of it besides a bigger stroke? thanks to all of you for your help
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