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5.0 and 5.7 Discussion, Is 5.0 really that bad? in Cadillac Engine Technical Discussion; I don't know what yall mean, calling the L05 underpowered. I test-drove a '92 5.0 and it was mighty powerful, ...
  1. #16
    My_favorite_Brougham's Avatar
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    Re: Is 5.0 really that bad?

    I don't know what yall mean, calling the L05 underpowered. I test-drove a '92 5.0 and it was mighty powerful, moreso than the 4.9 is in my '91 Coupe Deville. It would throw you back in your seat and it's over a 1000 pounds heavier than the my fwd. Maybe there was more low-end torque, as I felt that in my 307 Bro.

  2. #17
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    Re: Is 5.0 really that bad?

    Quote Originally Posted by My_favorite_Brougham View Post
    I don't know what yall mean, calling the L05 underpowered. I test-drove a '92 5.0 and it was mighty powerful, moreso than the 4.9 is in my '91 Coupe Deville. It would throw you back in your seat and it's over a 1000 pounds heavier than the my fwd. Maybe there was more low-end torque, as I felt that in my 307 Bro.
    Something must be wrong with your 4.9...... cause a 4.9 FWD DeVille, especially the '91-'93 (lightest years) should be faster then any '90-'93 5.7 Brougham..... much less a 5.0 Brougham, especially when talking right off the line torque and acceleration... 4.9 has a better torque curve, gearing is about equal, but the car weighs a lot less.

  3. #18
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    Re: Is 5.0 really that bad?

    You sure you are not experiencing the uber sensitive gas pedal on these older Broughams that give you the false illusion of super speed from 0-20?

  4. #19
    My_favorite_Brougham's Avatar
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    Re: Is 5.0 really that bad?

    Maybe it was just the big car feel; oh, and my 4.9 coupe does have an exhaust leak between the throttle-body and the block. That'll be one of my weekend projects.

    And as for an illusion, I'd be happy with that. .....man I miss my Brougham (307) even though it did 0-20 in about 30sec. (and yes I did mean 20...lol) The next will be chevy-powered

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    Cool Re: Is 5.0 really that bad?

    http://www.youtube.com/watch?v=TuKYBb9wPDs

    Here's an already half dead 5.0 Chevy with no oil, and coolant. Make an assumption on the engine.

  6. #21
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    Re: Is 5.0 really that bad?

    I have the 307 Olds...and it's pretty different than either the TBI 305 or the TBI 5.7. Not that anyone else will notice, but you have to keep your foot pressed in the carpet to get it to go with any urgency - but it does go if you push it.

    It is smooth and quiet and reliable though.

  7. #22
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    Re: Is 5.0 really that bad?

    Indeed. I like the 307. It's more powerful than people give it credit for, especially when tuned and cared for properly. Lots of torque helps out.

    Chances are if you bought a Cadillac, you weren't looking for a race car anyway.

  8. #23
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    Re: Is 5.0 really that bad?

    I've had plenty of LO5 350's and LO3 305's. It's funny because every one feels differant. My current 91 LO5 FWB feels like a rocket, yet my 93 Caprice 9C1 felt lethargic over 65mph. 2 days ago I picked up a 91 LO3 for a friend and it felt strong between 80-100 mph. Even my friend who was following me commented that he had to stomp the pedal on his 05 TL to stay with me. As far as the 350 Broughams ability to keep up with a 91 4.9 Deville...The jurys still out. I had a 91 and it was strong off the line...I think from 30 ^ the Brougham would hang.

  9. #24
    arivera is offline Cadillac Owners Fanatic
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    Re: Is 5.0 really that bad?

    My L05 is getting close to 200k, so I'm figuring if I should spend the money to rebuild and light mod, or do away with it and get a low mile LT1. I'm done with my search for a 90-92 fwb 5.0. At least for now...

  10. #25
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    Re: Is 5.0 really that bad?

    My LT1 just crossed 242K, shooting for the magical quarter million mark coming up in about 2 months.

    The L03's and L05's are decent for reliability, not real power houses, mainly because of the small cams and high swirl heads that were very restrictive to air flow. Do some port work or axle the heads for some Fast Burns or Vortecs and you have an engine that will REALLY wake up. Look at the Gen III V8's (LS1 style V8), they make silly amounts of power with a very small cam. 350 hp net with a cam in the 200 degree range with 0.500 lift. The LT1 was 300 hp with 204 degrees duration and 0.450 lift. The LT4 only made 345 hp with 206-210 duration and 0.500ish lift... The LS1 beat that... Not bad, not bad at all....

    The L05 with a Vortec head and 92-97 Z28/Vette/TA LT1 cam should easily be able to make 300 net hp... EASY. As long as you have good dual exhaust and good intake like the Edelbrock performer and a well tuned EFI or well tune carbie.

    Expect 250hp with a L03 with the same combo...

  11. #26
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    Re: Is 5.0 really that bad?

    Nothing wrong with the 307 or the 305. If I found a clean Brougham, that certainly would NOT stand in the way... In fact my own '91 has the 5.0 and I'm just fine with it. Broughams were luxury liners. More power is great, but it wouldn't be the deal breaker for me! Have had plenty of 307 Broughams over the years, and they are TANKS! They use almost no oil and they are incredibly reliable.

  12. #27
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    Re: Is 5.0 really that bad?

    I just bought a 87 Brougham with the 307 and was really unimpressed with the power but it was something I could live with. I finally got around to putting plugs in it yesterday and what a difference that made. The old girl now has a little pep in her step, as many have said this is a reliable engine with a proven track record.

  13. #28
    N0DIH's Avatar
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    Re: Is 5.0 really that bad?

    Look at it this way, a 305 or 307, is still an upgrade path to a visually identical 350, 383, 400 or 403 (depending on brand) or even 425 or 455 with minor visual discrepancies (for 307 cars).

    For me, one of these days if I get one, I will probably go with a 455 or 482 Olds and keep it looking stock yet, be a torque monster....

  14. #29
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    Re: Is 5.0 really that bad?

    482 Olds?
    "They call Alabama the Crimson Tide, call me Deacon Blues."

  15. #30
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    Re: Is 5.0 really that bad?

    Non stock, 455 block with stroker crank and bored block.... Was at the track last night and watched a few run (they guys I was there with) and they were running mid- to low 10's working on dialing them in. Nothing like seeing a G-Body wagon screaming straight as an arrow at those speeds.... Or a 71 442/W30, and a 71 with 72 grills/taillights.... All were cooking...

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