Mileage before/after LS swap?
Junior Member
Joined: May 2017
Posts: 352
From: North Dakota
I bought my 2002 2wd 2 door blazer 4.3/5speed with around 197K miles. I drove it for about 3k miles and I was averaging about 18-20 mpg.
My swap setup is a 5.3 with a 224/224 camshaft, built 4L60E with a 3200 stall converter and I have about 7k miles on this setup. I now get about 22-24 Mpg on the highway but only around 14 around town due to the converter.
My blazer has the factory 3:42 gears, 28in tires and weighs about 3800lbs.
If the LS engine is tuned well, you can get very good mileage because its not working hard.
Even with the gen 3 5.3 you are only adding 1 liter to the engine displacement, but stock they are over 100hp more than the 4.3.
My swap setup is a 5.3 with a 224/224 camshaft, built 4L60E with a 3200 stall converter and I have about 7k miles on this setup. I now get about 22-24 Mpg on the highway but only around 14 around town due to the converter.
My blazer has the factory 3:42 gears, 28in tires and weighs about 3800lbs.
If the LS engine is tuned well, you can get very good mileage because its not working hard.
Even with the gen 3 5.3 you are only adding 1 liter to the engine displacement, but stock they are over 100hp more than the 4.3.
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BF Guru
Joined: Dec 2016
Posts: 5,588
From: Moscow, ID
I bought my 2002 2wd 2 door blazer 4.3/5speed with around 197K miles. I drove it for about 3k miles and I was averaging about 18-20 mpg.
My swap setup is a 5.3 with a 224/224 camshaft, built 4L60E with a 3200 stall converter and I have about 7k miles on this setup. I now get about 22-24 Mpg on the highway but only around 14 around town due to the converter.
My blazer has the factory 3:42 gears, 28in tires and weighs about 3800lbs.
If the LS engine is tuned well, you can get very good mileage because its not working hard.
Even with the gen 3 5.3 you are only adding 1 liter to the engine displacement, but stock they are over 100hp more than the 4.3.
My swap setup is a 5.3 with a 224/224 camshaft, built 4L60E with a 3200 stall converter and I have about 7k miles on this setup. I now get about 22-24 Mpg on the highway but only around 14 around town due to the converter.
My blazer has the factory 3:42 gears, 28in tires and weighs about 3800lbs.
If the LS engine is tuned well, you can get very good mileage because its not working hard.
Even with the gen 3 5.3 you are only adding 1 liter to the engine displacement, but stock they are over 100hp more than the 4.3.
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Irishpride13
2nd Generation S-series (1995-2005) Tech
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May 14, 2017 09:33 AM