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  1. #1

    Default Xfi252 cam in stock 350tbi??

    Im building a near stock
    350 tbi. Gonna port the heads and intake manifold a bit and do he ultimate tbi mods.
    Im really interested in the xfi252 cam. It seems very. Omputer friendly and doesnt require headers. Although i may or may not get headers i dont know yet.
    But i used comp cams camquest software and it told me that a stock headed and stock tbi intake with a 500cfm tb would make 279hp@4000rpm and 447ft/lbs@2000. That was with long tubes and no cats with mufflers. With stock manifolds and no cats it went down to around 240hp and a few less torque.
    My question is if the difference between long tubes and headers is realistically so little, should i just get manifolds? Its gonna be a daily driver truck and i just want torque mainly so maybe manifolds will help the torque down low as oposed to headers?
    Also how acurate do you think thise numbers are? They sound pretty nice although too good to be true.

  2. #2


    Give Comp Cams a call. They have advisors that can answer your questions and tell you what to expect from the cam.

    97 Chevrolet Suburban K1500 5.7L
    78 GMC High Sierra K1500
    Fat, drunk, and stupid is no way to go thru life.

  3. #3


    This is what I used for my build, and I'm very happy with it.
    Chev SB
    Lift: .420/.443
    Duration: 278/288
    Duration @ .050": 204/214
    Lobe Center: 112
    Smooth idle. Improved power. Good low and mid-range.

    Very economical cam, with solid power. Got about 5k on it since the rebuild, and it feels real good, good power, pretty good economy.

    I would also recommend long tubes for it, if you can get them reasonably cheap.
    1986 Chevy G20 Tow Rig - 5.7 TBI conversion
    1978 Mustang II King Cobra Road Racer - Holley 650, MSD 6AL, 5 speed, 10 point Roll Cage, 9" posi, fuel cell, custom interior.

  4. #4


    Id have to agree with the first post stated, i would give com camps a call if thats the cam you wanna use. im running a tr 220 cam on my truck and i love it its a well know cam and works great for my 5.3 but its also more mid-high end cam.... just call em they wont stear ya wrong
    2004 gmc sierra ext z71 5.3
    KB racing hot pipes 3.5" : 76mm turbo: 4l80e : Circle-d 2b multi disk :Walbro 400 : Racetronix Hotwire kit : TB coolant bypass : Nelson 91 Pcm : Tr 220 Cam : Brian Tooley double springs kit : Ls7 Lifters : Stage 3 heads : Custom Intake Manifold :80lb Injectors : Ported TB : 40k tranny cooler: Plx dm-100 gauge: Auto meter fuel and boost gauge:
    Custom Speedo : Leveling kit :Smoked led taillights and 3rd break light : Black projectors and fogs with hids : Blacked out grille : 33's on 16's : Clarion flip screen: sound que 12" subs: clerion 6x9's : Memhpis amps: Alpine componet set.
    Future mods... Detriot tru-trac, deviels own stage 2 meth kit, MORE BOOST!!!!!!!!!!!!!!

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