Are 4.8l vortecs really worth it? - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Oilbrnr · 03-02-2013, 12:03 AM

Quote:

Originally Posted by BRUISER

What happened to the 241 in '89? I have one in my 85 and have an auto to manual swap planned.

I believe it to be the only year with a cable driven speedo which is what I want to stick with given the fact that my '77 has a nice original tach cluster. 90-1 had VSS (great for a LS conversion though). Unsure about '88 at this point.

I still need to do more research, but the LS swap is the first priority at this point.

68Timber · 03-02-2013, 12:10 AM

You are Larry's son aren't you? I'm sure it will look factory when it's done, with both tranny's. The 4.8/SM465/NP205 will be really cool while it lasts, but the NV4500 will give it a new personality. Sounds fun, I'll be watching for that.

Oilbrnr · 03-02-2013, 12:18 AM

Quote:

Originally Posted by BRUISER

You are Larry's son aren't you? I'm sure it will look factory when it's done, with both tranny's. The 4.8/SM465/NP205 will be really cool while it lasts, but the NV4500 will give it a new personality. Sounds fun, I'll be watching for that.

no, I think I'm the same age as Larry. But if he wants to be my Dad and come down here and help, I sure wouldn't mind! I do pick his mind every now and then though. He does tend to make things seem awfully easy.

FWIW, it looks like an '88 241 is also an option (now that we've completely highjacked this thread)

68Timber · 03-02-2013, 12:26 AM

Quote:

Originally Posted by Oilbrnr

no, I think I'm the same age as Larry. But if he wants to be my Dad and come down here and help, I sure wouldn't mind! I do pick his mind every now and then though. He does tend to make things seem awfully easy.

FWIW, it looks like an '88 241 is also an option (now that we've completely highjacked this thread)

I know, right?

I think he said something in his trip thread that I obviously took all wrong.

Still, it'll be a great swap in each phase.

tucsonjwt · 03-03-2013, 08:28 PM

I have owned 4.8 and 5.3 new Tahoes, Yukons, Sivlerados. Sierras, etc., and there is a difference in acceleration ability with the 5.3. If you kick down the accelerator on the 5.3 will take off a bit faster. However, in daily easy driving, especially in the city, there is no difference in performance. I would say gas mileage is about 2 mpg better in the city with the 4.8. I tried to get 3.42 rear axle ratio (or lower) on those new vehicles and got 15.5 city/18.5 highway on my last 2010 ext. cab. Sierra with 3.23 (I think) rear axle ratio.

03-02-2013, 12:10 AM	#27
68Timber I know the pieces fit Join Date: Nov 2007 Location: MONTGOMERY, AL Posts: 5,523	Re: Are 4.8l vortecs really worth it? You are Larry's son aren't you? I'm sure it will look factory when it's done, with both tranny's. The 4.8/SM465/NP205 will be really cool while it lasts, but the NV4500 will give it a new personality. Sounds fun, I'll be watching for that. __________________ John 79 2wd Blazer (Bruiser) 85 M1009 Blazer (Sarge) build 74 Honda Z50 build

03-03-2013, 08:28 PM	#30
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,188	Re: Are 4.8l vortecs really worth it? I have owned 4.8 and 5.3 new Tahoes, Yukons, Sivlerados. Sierras, etc., and there is a difference in acceleration ability with the 5.3. If you kick down the accelerator on the 5.3 will take off a bit faster. However, in daily easy driving, especially in the city, there is no difference in performance. I would say gas mileage is about 2 mpg better in the city with the 4.8. I tried to get 3.42 rear axle ratio (or lower) on those new vehicles and got 15.5 city/18.5 highway on my last 2010 ext. cab. Sierra with 3.23 (I think) rear axle ratio.



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