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  • #16
    Well I want to remove the cat only temporarily, honestly. I too want to keep a cat on there, but the catalyst elements inside the converter housing is all busted up and rattling around and driving me crazy. Plus it can't be good for flow ... being loose in there and potentially creating a blockage at times.

    So, I potentially have a set of TPI heads setting waiting for me. I just gotta offer my buddy some money on 'em. I already got his harness and TPI setup. I already have the ECM, harness, plenum, runners, lower manifold, throttle body and all the sensors that are in the plenum. The only problem with the setup is that it needs a trip to the parts washer at work, its missing ALL of its bolts, I think all of the sensors need to be replaced, I need all new hoses, and the harness has a few things snipped off of it. I think like two things.

    So my question is can I use my TBI, TBI intake, and Headman 1 5/8" headers and 2 1/4" exhaust and stock TBI fuel pump with TPI heads, ported TB and current computer/sensors/bracketry? Honestly I'm not overly interested in putting a cam in ... sounds like allot of work to pull the whole thing back apart. Would a cam be worth the work? Being the radiator fan, radiator, condenser, all bracketry, crank pulley, harmonic balancer, timing chain and cover ... And then, wouldn't I run into the new cam hitting the freeze plug in the back of the engine? I had to install that plug before I put this engine in the car. I honestly don't know if I put it in too far or not, but it's in just past the lip.

    I don't think I'm loosing spark through the wires, but the two straight boots that are on the two wires are starting to melt on the corners. As far as I know, no other wires are melted.

    Keep in mind, now that this car runs, I'll have enough room in my garage to build my 383 I have edlebrock performer cam, heads, intake and 750 carb, 1.8 roller rockers (I can't remember at the moment), eagle rotating assembly ... So putting massive amounts of effort into this 305 isn't my top priority at the moment. Plus the car needs a paint job, all new T-Tops seals, trunk seal, undercoating/derusting the underbody, a steering brace, strut tower brace, subframe connectors ... the list goes on forever.

    Also my buddy gave me a double roller timing chain setup for a 305. Worth it if I were to do a cam in this 305?
    91 Firebird 305 TBI

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    • #17
      If you have a new engine in the works, don't bother messing with the internals of the 305. Don't go over 1.6 roller rockers with an Edelbrock performer cam on the new mill.

      1998 Camaro Z28 - Bright Red, 6.0 TR224, 4l60e, 3.42 Eaton TrueTrac
      1989 Camaro IROC-Z Convertible - 355 big tube TPI, WC T5, 3.42 Zexel Torsen, CTS-V/C4 brakes
      1955 Bel Air 2 Door Post - 357 TPI, Muncie M20, 4 wheel disc

      2006 Saab 9-7x 5.3i Daily Driver

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      • #18
        I could have those heads for very little money though ... so a little money and a little work and I have some new better flowing heads. How much do you think just cylinder heads will help on this L03?
        91 Firebird 305 TBI

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        • #19
          Right now you're probably around 200, maybe a little less. Some decent flowing LB9 heads heads +50. LT1 cam, 1.6 RR could bump it up another 30-40 but you will get restricted by the stock TBI setup. 9C1 injectors and a bumped up fuel pressure would help solve that.

          1998 Camaro Z28 - Bright Red, 6.0 TR224, 4l60e, 3.42 Eaton TrueTrac
          1989 Camaro IROC-Z Convertible - 355 big tube TPI, WC T5, 3.42 Zexel Torsen, CTS-V/C4 brakes
          1955 Bel Air 2 Door Post - 357 TPI, Muncie M20, 4 wheel disc

          2006 Saab 9-7x 5.3i Daily Driver

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          • #20
            you can buy my 383 =). anywho once you put your 383 in youll have to upgrade the fuel system. how long are you keeping the 305 in would determine wether or not to do a cam swap to me. its fairly simple thing to do just need the time to do it.
            91 Trans am, 305, Lt1 cam, 24lb injectors, headers, SLP LM2, SW chassis, massive panhard, lowered, modded TPI, Tuned, 4.10s, Lincoln locked
            85 Z28 406/th400?/3.42 4th gen disc rear/4th gen dash
            00 Tahoe Z71........Stock
            97 K1500 lt4 cam, 1.6s, MPFI, Solid axled, IROKs,------winter beater

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