5.7 lt1 VS. FORD 4.6 which is more durable - Page 2
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5.0 and 5.7 Discussion, 5.7 lt1 VS. FORD 4.6 which is more durable in Cadillac Engine Technical Discussion; My cousin had a 95 Vic fgor about 2 years. He put about 45k on it and sold it at ...
  1. #16
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    Re: 5.7 lt1 VS. FORD 4.6 which is more durable

    My cousin had a 95 Vic fgor about 2 years. He put about 45k on it and sold it at 120k. No problems. It did smoked a little.

  2. #17
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    Re: 5.7 lt1 VS. FORD 4.6 which is more durable

    Quote Originally Posted by drewsdeville View Post
    Is that possible??? How do you know it's factory??? The contacts on the cap and rotor wouldn't even be touching each other by now...

    But I guess, you know your car better than I. If tht's true, those contacts must be some sort of exotic metal...

    The water pump doesn't suprise me. Most cast-iron water pumps can outlast the car they are in.
    Actually, with the LT1, the water pumps do tend to go by a certain time, but still generally last quite a long time.

    The Optisparks, on the other hand, right on the front of the block below the water pump just as N0DIH said, last a LONG, LONG time both with proper maintenance and without. SSStealth was one member on this board who owned his '94 Fleetwood from new and passed over 300k miles without ever touching his.

    Here's a terrific thread on that matter, posted by him quite a while ago:

    http://www.cadillacforums.com/forums...000-miles.html

    He's still active on the Impala SS board, still has the car--though it was for sale there for a while, as he just bought a new STS-V and also has a company car--and it still is largely untouched in many ways. Last check-in was 335,600.

    Also, just to show more recent stuff, here's a link to his pics of the car:

    http://s82.photobucket.com/albums/j2...0SS/?start=all

    --------------------------

    I've seen both 4.6 OHC's and LT1's cross similar high mileage with, apparently, the same small number of repairs. But overall, I've seen a bit more LT1's that have been run through the gamit and taken a beating, yet still run almost bizarrely well--so I give that engine the edge.l

  3. #18
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    Re: 5.7 lt1 VS. FORD 4.6 which is more durable

    Bah, the 4.6!! I had a 1993 Town Car Cartier... it was the worst 7 months of vehicle ownership. Engine wise, the intake manifold drove me nuts and eventually caused several other $$$$ problems. The car was also plagued by electrical gremlins!! Guess that is what I get for buying a low mileage 1 owner South Florida car
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  4. #19
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    Re: 5.7 lt1 VS. FORD 4.6 which is more durable

    That's the only time I've heard of an intake manifold problem on a pre '95 SOHC 4.6. What happened?

  5. #20
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    Re: 5.7 lt1 VS. FORD 4.6 which is more durable

    Overheating and more overheating... I am pretty sure when I sold the car the engine was 90% gone from all the overheating. I was completing my masters when I had that car and I just kept driving it despite the overheating just because I was so pissed. I would drive it until it would cut off from being so hot. At least I sold it cheap and with a trunk load of parts to fix it. The body and interior were mint on that car... such a shame.
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  6. #21
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    Re: 5.7 lt1 VS. FORD 4.6 which is more durable

    i love my fleet, to death BUT, i have seen an airport taxi with over 650000 miles on it. It was propane powered and looked like shit inside. it was a lincoln 4.6, i have never seen an lt 1 with that milage. Is this due so the main bearings?

  7. #22
    96Fleetwood's Avatar
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    Re: 5.7 lt1 VS. FORD 4.6 which is more durable

    Our friend's 1994 Fleetwood stretch limo has 432,000 on the original LT1.. but that is the highest I haver personally seen.
    1994 Cadillac Fleetwood- the sleeper project
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    2002 Cadillac Eldorado Collectors Series # 1572
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  8. #23
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    Re: 5.7 lt1 VS. FORD 4.6 which is more durable

    Very cool. Any list of what sort of maint he had to do to keep it running that long? What are the "weak" points? I just cleaned up my Opti, new seals all around and replaced the water pump with a NAPA rebuilt.

  9. #24
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    Re: 5.7 lt1 VS. FORD 4.6 which is more durable

    Quote Originally Posted by Hammondsix View Post
    i love my fleet, to death BUT, i have seen an airport taxi with over 650000 miles on it. It was propane powered and looked like shit inside. it was a lincoln 4.6, i have never seen an lt 1 with that milage. Is this due so the main bearings?
    I remember seeing this on another site. 94 9c1.
    Attached Images

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    Re: 5.7 lt1 VS. FORD 4.6 which is more durable

    ive had both engines and i prefer my LT1. the 4.6 was an awesome motor that ran extremely well... i just like saying "yeah, i got a Vette engine." both have their strong points and are very well made.

  11. #26
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    Re: 5.7 lt1 VS. FORD 4.6 which is more durable

    And now, compare the COST of both engines, or better yet, a 4.6L/5.4L to a 4.8L/5.3L GM V8. The GM being several thousand cheaper....

  12. #27
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    Re: 5.7 lt1 VS. FORD 4.6 which is more durable

    Quote Originally Posted by N0DIH View Post
    Very cool. Any list of what sort of maint he had to do to keep it running that long? What are the "weak" points? I just cleaned up my Opti, new seals all around and replaced the water pump with a NAPA rebuilt.
    N0DIH,

    Good luck with the NAPA rebuilt. I am on my second one since I bought the car and I have only owned it since 11-01-06. I am in process of filing a labor claim with them to get reimbursed. One pump is a fluke, two pumps is ridiculous. I don;t mind the work to put it in, but having to do it three time ins the middle of the winter is no fun.

    BBB

  13. #28
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    Re: 5.7 lt1 VS. FORD 4.6 which is more durable

    How long did the pump last? The seal looked similar to the seal that I put in from GM for the water pump drive. I hope it is a good one...

  14. #29
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    Re: 5.7 lt1 VS. FORD 4.6 which is more durable

    Quote Originally Posted by N0DIH View Post
    How long did the pump last? The seal looked similar to the seal that I put in from GM for the water pump drive. I hope it is a good one...
    My first one lasted a month before the weep hole was leaking like a siv (sp?) and the second one is a manufacturers defect I think...the upper radiator hose mount that is pressed into the body of the pump is leaking. I had the second one for two days before that one was leaking and it is still in my car because I don't want to buy another one until I get everything cleared up with NAPA. I worked there for about three months this past summer. I knew the owner of the NAPA from 2000 when I worked there for a year, so I bought my stuff from him since I got his discount. I will still buy stuff from NAPA because I like going there and they are always friendly, however I doubt I will by another water pump, well at least a rebuilt one anyway. I would just watch your pump, that's all. Maybe I had bad luck.

  15. #30
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    Re: 5.7 lt1 VS. FORD 4.6 which is more durable

    Quote Originally Posted by N0DIH View Post
    And now, compare the COST of both engines, or better yet, a 4.6L/5.4L to a 4.8L/5.3L GM V8. The GM being several thousand cheaper....
    Quote Originally Posted by 93fleetwoodlowlow View Post
    i just like saying "yeah, i got a Vette engine." both have their strong points and are very well made.
    True, but the 4.6 is the Mustang motor, which is sorta the same. The LT1 was the detuned, slightly changed Corvette engine. If you get the dual exhaust SOHC 4.6, it's the exact same motor they used in the Mustangs. I believe even the hp rating is the same at 210.

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