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  1. #1
    Sr. Apprentice Dontlookforme's Avatar
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    Default 4.8L build to reach 375-385 hp, all motor!

    Looking to build a 4.8L Monster! I got one out of a junkyard and its sitting in my shop. Im pritty sure that the 4.8L, 5.3L, 6.0L motors are from the same cast iron block! i know that the 6.0L motors now make 345+ hp. So my goal for making 375-385 hp, is a possibility? Im looking to bore and stroke the 4.8L 292ci out to a 366ci or somthing as close as i can. While still having enough meat left to reuse the motor again. Any ideas or suggestions would be great!

    Thanks jason
    2006 silverado 1500 LT1 4X2 ecsb 6.0L, front mount T76 turbo intercooled, Detroit true trac, 3.23, Chevrolet black chrome 20"s, Nelson performance tune! magna flow muffler with dual exhaust with QTP cut out. ET-14.001 @100mph spinning.....

  2. #2
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    murdog94's Avatar
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    Default

    Obviously a cam, and some porting on the heads, high output Injectors, better intake.
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  3. #3
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    stephan's Avatar
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    Default

    What kind of fuel are you planning on running Jason? Pump gas?
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


  4. #4
    Sr. Apprentice Dontlookforme's Avatar
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    Default

    Yes, pump gas. 93 octane.

  5. #5

    Default

    I believe the 4.8 and the 5.3 are the same block and the 6.0 is differant. You can bore the 6.0 more than the 4.8&5.3. Theres a reason you see most people using the 6.0 block for performance engine building.

  6. #6

    Default

    I would go a little farther than just porting and polishing the heads, like maybe an entirely new set. I would start looking at full builds on LS1s and LS6s and see what you like and start from there.
    2002 Chevy 1500 Ex-cab Z71: 5.3L, auto 4, shorties, hi-flow cats, true dual 2.5" straight pipes, AirAid intake, TBS, Platinum plugs, 8.5mm wires, programmer, 3in w/ 33s, also has the composite bed

    2010 GMC 1500 Crew Cab Z71 w/ All Terrain package: 5.3L, auto 6, 2" Zone leveling kit, AirAid Jr. Intake Kit

  7. #7

    Default

    Also on 4.8 & 5.3's theres a limit to what cylander heads you can use because of there small cylinder bore.

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