TPITuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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ok im new to THIS thirdgen site and i read all about the BANNED post and i didnt see this question in here so i hope im not braking the rules! if i put lt1 cam in 89 lb9 without a chip or tune will it still run good?
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I actually have the LT1 cam in my LB9, but it hasn't run in this car yet so I don't know for sure. However, the guy I bought the engine from (good friend and GM parts counter guy so I trust his judgement) said it ran very well in his '91 T/A.
The lt1 cam is not that much different from the L98 cam which could have come in the LB9 aswell. With your car being a MAf car I think you should be ok. Once you really start changing things you will need a chip but a cam this mild I would think yo uare ok.
__________________ 91 RS 350 TPI, Custom S_AUJPv4 chip, Accel 300+ ign., LT1 cam, BBK AFPR, Edelbrock true trak timing set, B&M Shift kit & trans cooler, March underdrive pulleys, Edelbrock TES into 3 in Catco cat in to Dynomax catback. 3.73 w/ SLP Zexel Limited Slip, UMI LCA's, SFC's Alpine Digital Media Center.
The LT1 cam with will run good with no changes to the chip needed. It's an easy swap in that will give you a solid 25 to 30 rearwheel horsepower and wake up that 305.
The LT4 hot cam is aggresive and would require you to change the valve springs in the head and require custom programming.
ok thanx... this third gen site is way better than the one i was on b4!! what about the lt4 cam? how much diffrent is it from the lt1 cam?
i went from the stock lt1 cam in my 96 to the complete lt4 kit with the hotcam and 1.6 rockers(rockers are part of the kit-i think that the lift and duration figures stated for the hotcam are based on 1.6 rockers) and the hotcam is a pretty big step up compared to the stock cam. required a complete tune of the pcm to be drivable. awesome power increase though.
__________________ 1985 IROC Original Owner.Original silver paint, Roller 406c.i., 4 bolt, Superram, accel DFI 6. serpentine setup, Factory GM 1LE brake set-up, richmond 5 speed, 1 3/4 slp, jet hot, gale banks 2OTL power pack (vintage), eibach, grey leather flo-fits, A/C delete, 29k original miles and never been driven in the rain. all original parts are on the shelf. original window sticker and build sheets. 1996 Z28 M6 LT4 kit, hotcam, obd1, C5 brakes. And then theres the road runner.
1985 IROC Original Owner.Original silver paint, Roller 406c.i., 4 bolt, Superram, accel DFI 6. serpentine setup, Factory GM 1LE brake set-up, richmond 5 speed, 1 3/4 slp, jet hot, gale banks 2OTL power pack (vintage), eibach, grey leather flo-fits, A/C delete, 29k original miles and never been driven in the rain. all original parts are on the shelf. original window sticker and build sheets. 1996 Z28 M6 LT4 kit, hotcam, obd1, C5 brakes. And then theres the road runner. 
