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Thread: 703 RWHP 4x4 6.0L

  1. 12-20-2004 11:49 AM #1
    Speed Engineering
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    Just got our F1 project truck done and dynoed. We through it on the dyno with 8lb. of boost and we happy to see that it dynoed 703 RWHP. Still having a problem lifting the heads though. Any time we go above 8lb. of boost we have problems lifting the heads. We need to put bigger studs in the heads down the road. The setup includes:
    -6.0L block
    -Custom Diamond Pistons
    -Lunati Rods
    -Stock Crank
    -LQ9 Heads with bigger valves
    -AZ Longtubes
    -Blower cam
    -& we keyed the crankshaft
    You guys can check it out if you like. (Link)

    Sean
    Speed Engineering
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  2. 12-20-2004 02:11 PM #2
    RedHeartbeat
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    If you are lifting the heads on a steel block, you most likely need to go to a set of AFR heads since they have a much thicker deck and won't deflect as easily. Your only other choice is a set of cast iron heads. I would not think that a set of larger bolts would stop the heads from lifting.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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  3. 12-20-2004 03:29 PM #3
    Speed Engineering
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    A lot of people are having problems with lifting heads. Most of them upgrade from a 7/16" stud to the 1/2" studs and it fixes their problems. Since the LS1 only has 4 head bolts per cylinder it has a hard time of keeping the heads down.
    Speed Engineering
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  4. 12-20-2004 06:18 PM #4
    RedHeartbeat
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    Those stretch to yeild type bolts are the death of high performance IMO. They are designed to stretch for some reason. I never saw the logic in that. That just sounds like a blown head gasket looking for a place to happen.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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  5. 12-20-2004 09:14 PM #5
    Hit Man X
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    Pretty kickass!
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  6. 12-20-2004 10:21 PM #6
    RedHeartbeat
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    Was that an STS setup? What are the specs on the turbo? Sounds like some awesome results. Any port work done on the heads? What was your static compression ratio?
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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  7. 12-21-2004 12:42 PM #7
    Speed Engineering
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    Sorry it is a F1 Procharger. No port work done just LQ9 heads with bigger valves.

    Sean
    Speed Engineering
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  8. 12-21-2004 08:16 PM #8
    kinjo1977
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    That baby is gonna be tearin' up the track. Nice work
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  9. 12-21-2004 09:00 PM #9
    RedHeartbeat
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    Pretty good results. How much parasitic hp loss is there running a procharger? It's amazing what a little forced induction will do for hp numbers. Can you post the dyno readout?
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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  10. 12-21-2004 11:01 PM #10
    Speed Engineering
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    I would but, we didnt dyno it. We are not fortunate enough to have a dyno. It was done around his house which is about two hours away.
    Speed Engineering
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