1999 K2500 Suburban repower options - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Oifla · 10-25-2022, 08:27 AM

Hello all,

Have a much loved 1999 Suburban K2500 with the 7.4L (454) vortec. Original engine needs rebuilt (lower end noises) but I don't have time to do it right now. Instead, I'd like to swap something in while I take my time working on the big block. Three options as far as I can tell:

a) there's lots of 5.7L Vortecs around to be had with the entire donor vehicle. could swap the engine in but I'm not sure what else needs to be adapted. exhaust? (this is the cheapest option)

b) look for a 6.5L diesel? don't know what's required as far as anything beyong the engine itself

c) bite the bullet and pay for a 554 (this is the most expensive option)

Thoughts? Any other options I'm not thinking about?

Thanks
O.

95 S_Trucker · 10-26-2022, 06:38 AM

Swapping to a 5.7 or 6.5 will require extensive wiring modifications, the 6.5 would require different fuel system. Exhaust would be the easy part.

To avoid long downtime, rebuild a junkyard engine or buy a reman unit. I put one in my 99 a few years ago.

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**special-K** · 10-26-2022, 07:42 AM

I agree with 95 S Trucker. I think your best bet would be stay with a 454 any way you go about it. I think adapting to another series engine is too complicated for a temporary solution and would need changed back again, even worse.

Oifla · 10-26-2022, 11:13 AM

I'm looking for one but so far, nothing to be found. Thanks all

O.

10-25-2022, 08:27 AM	#1
Oifla Registered User Join Date: Nov 2016 Location: Indiana Posts: 5	1999 K2500 Suburban repower options Hello all, Have a much loved 1999 Suburban K2500 with the 7.4L (454) vortec. Original engine needs rebuilt (lower end noises) but I don't have time to do it right now. Instead, I'd like to swap something in while I take my time working on the big block. Three options as far as I can tell: a) there's lots of 5.7L Vortecs around to be had with the entire donor vehicle. could swap the engine in but I'm not sure what else needs to be adapted. exhaust? (this is the cheapest option) b) look for a 6.5L diesel? don't know what's required as far as anything beyong the engine itself c) bite the bullet and pay for a 554 (this is the most expensive option) Thoughts? Any other options I'm not thinking about? Thanks O.

10-26-2022, 06:38 AM	#2
95 S_Trucker Registered User Join Date: Oct 2009 Location: . Posts: 2,187	Re: 1999 K2500 Suburban repower options Swapping to a 5.7 or 6.5 will require extensive wiring modifications, the 6.5 would require different fuel system. Exhaust would be the easy part. To avoid long downtime, rebuild a junkyard engine or buy a reman unit. I put one in my 99 a few years ago.

10-26-2022, 07:42 AM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,859	Re: 1999 K2500 Suburban repower options I agree with 95 S Trucker. I think your best bet would be stay with a 454 any way you go about it. I think adapting to another series engine is too complicated for a temporary solution and would need changed back again, even worse. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

10-26-2022, 11:13 AM	#4
Oifla Registered User Join Date: Nov 2016 Location: Indiana Posts: 5	Re: 1999 K2500 Suburban repower options I'm looking for one but so far, nothing to be found. Thanks all O.



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