Engine Performance + Maintenance

If it's under the hood, its in here.

96+ Vortec Performance + Computer Swaps

If you want to do the 0411 PCM swap or have a 1996+ Vortec motor this is your forum!
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901
Messages
11.2K
Threads
901
Messages
11.2K
S
Stock ECU Tune on 1999 L29 454

LSX + Carb Swaps

This section is for info on LSX or carburetor swaps into the OBS trucks.
Threads
445
Messages
5.6K
Threads
445
Messages
5.6K
S
'99 Silverado 4.3 to 5.3 Swap with 4L80e bonus

Exhaust

Anything exhaust - from headers cats and pipes to tips.
Threads
914
Messages
10.9K
Threads
914
Messages
10.9K
454cid
Rear Catalytic Converter Direct Fit Options - 1999 7.4 CCSB
Mike
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Water Pump Relacement
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Engine Oil Cooler Upgrade: Add 2 quarts! (SAS guys you'll want to see this)
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Intake Gasket Replacement
11 12 13
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S
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How to MarkVIII your OBS on a budget..!
15 16 17
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  • Sticky
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Morchella
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322
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Narrowing down common TBI problems...
2 3 4
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dave s
dave s
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Need tall 7.4/6.5 upper radiator brackets
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454cid
454cid
J
Wrong size starter
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118
Schurkey
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mattyg
Cracked 5.7 block at Starter Bolts
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43
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haroldwca
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No start TBI - fuel pressure drops to zero after priming
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454 camshaft
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LC2NLS6
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Idle Problems
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Schurkey
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California smog tune ban!!!
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LS fuel lines
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156
Leeztruk
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McSweeney
Possible vacuum leak not sure need help
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I think I have water in the fuel
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454cid
Air Filters.... HD RPO K47 vs. Standard
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395detroit
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Baszboy
99 Yukon failed emissions test.
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Schurkey
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