N/A 408 stroker lq9 expectations
Oct 29, 2018 | 10:36 PM
#1
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From: West Tennessee
N/A 408 stroker lq9 expectations
I’m currently in the process of building a lq9 stroker and I was wondering if anyone could give me any idea of their reliability, recommendations, and fuel mileage. I understand that it’s a high displacement engine not a Prius, but I’m hoping to see at least 10mpg tuned. My truck is a 03 Sierra 1500 ext cab with a 3” lift on 33s with 3.73 gears and 1 3/4 long tubes and a flow master 40 series currently and here’s some of my parts list:
Gen 3 408 short block from TSP
TSP N/A bald eagle cam
Yank TT3000 stall
stage 2.5 5.3L heads with PAC .660” dual springs
factory rocker arms with CHE bushings
holley mid ram Intake
lsx e-fan harness and e-fan setup
gm high performance oil pump
rollmaster double roller
ls7 lifters and trays
the truck will never see a track but I do like to show out from time to time, and I do mild off-roading.
Gen 3 408 short block from TSP
TSP N/A bald eagle cam
Yank TT3000 stall
stage 2.5 5.3L heads with PAC .660” dual springs
factory rocker arms with CHE bushings
holley mid ram Intake
lsx e-fan harness and e-fan setup
gm high performance oil pump
rollmaster double roller
ls7 lifters and trays
the truck will never see a track but I do like to show out from time to time, and I do mild off-roading.
Oct 30, 2018 | 07:58 AM
#2
I dont see why it wouldnt get better than 10mpg. My neighbor has an 8.1 Suburban that can eek out 13 on a mild day, so I'd think a 6.67L with better heads could jam the same, provided your foot isnt matted.
Oct 30, 2018 | 10:31 AM
#3
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From: West Tennessee
see what concerned me with the fuel mileage is that my factory lm7 5.3 gets 10mpg on a good day but it’s at 189K and hasn’t been tuned so I was hoping that was the issue
Oct 30, 2018 | 07:02 PM
#5
shoot, i've got 193k on my cam/exhaust 5.3 and average 15mpg mixed driving with 33s & 4.30s
even with dished pistons, you're probably high 11.x:1 CR with 5.3 heads. that'll help a bit on efficiency compared to ours, too.
even with dished pistons, you're probably high 11.x:1 CR with 5.3 heads. that'll help a bit on efficiency compared to ours, too.
Oct 30, 2018 | 07:38 PM
#6
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From: West Tennessee
I hope so. I’ll be happy just to see double digits tbh I’ve done learned to balance my checks around it
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Oct 31, 2018 | 08:44 AM
#8
Your trucks all probably weigh more than my reg cab long bed 2500, and bigger tires and gearing also make the comparison even more apples to oranges, but here goes. I have been driving around N/A all summer and I get almost 14 mpg on the highway. When the blower is on it doesn't change the highway mileage anyway.
