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500, 472, 425, 368 Discussion, 6.0 368 pros and cons in Cadillac Engine Technical Discussion; My '79, all stock with 88k or so ran a 17.5s @ 78mph.... this dosn't reflect when new, this relfects ...
  1. #31
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    Re: 6.0 368 pros and cons

    My '79, all stock with 88k or so ran a 17.5s @ 78mph.... this dosn't reflect when new, this relfects as she was at the time. After that I did some minor performance mods which really opened it up nicely.

    I still think the '77-'79 will be faster.... the extra displacement of the 500 isn't enough to warrant the extra 1,000lbs.... power output was similar.... keep in mind, the 500 was bogged down with more emmissions then the 425.... 425 never had an AIR pump etc...

    the 500 has the gears, but the 425 has the weight on its side....

  2. #32
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    Re: 6.0 368 pros and cons

    Lets see here...the 1976 4BBL 500 was 190hp & 360 lb/ft, but that was probably underrated. The 1976 Fleetwood Brougham was 5213 lbs dry.

    In a 1975 issue of Motor Trend, they tested a '75 Eldorado Coupe with the 4BBL 500 and got a 0-60 of 10.9, and a 1/4 mile of 17.60@ 78.1 MPH, so maybe the 425 isn't that much quicker

    The 1977-79 425 4BBL was 180hp and 325 lb/ft. I'm not sure how underrated that is, if at all. The 1979 Fleetwood Brougham was 4250 lbs dry.

    I wonder what a '77-78 Eldo is capable of...

  3. #33
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    Re: 6.0 368 pros and cons

    noooooooo don't start the numbers thing again......

  4. #34
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    Re: 6.0 368 pros and cons

    I am the Rain Man!

  5. #35
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    Re: 6.0 368 pros and cons

    A.I.R. pumps used very little horsepower. Some 425s did have them.
    Dunno about Fleetwood. '76 CDV weighed in at 5075 Lbs at raceway park right after I ran 16.4. Car was all original except for a gutted cat. I raced a guy with another '76 CDV on the 3rd run. His ran 16.01 with a posi limo rear, cool can and some ignition work.
    Gears can make quite a difference.
    A 500 in the '77 makes for a nicely powered vehicle.
    I put one together in October of 1987.
    Got another in October '88.
    Put the entire stem to stern drivetrain from the first '77 (including the 500) into a 1983 CDV back in 1993. Best car I ever had.

  6. #36
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    Re: 6.0 368 pros and cons

    A 1976 Coupe deVille that runs a 16.4 is mindblowingly awesome! It could almost keep up with a 4.9 powered car despite the additional 1600 lbs of weight.

  7. #37
    Jed95fwb is offline Cadillac Owners Member
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    Re: 6.0 368 pros and cons

    Greetings,
    It might be a little late, but I wanted to comment on the Cadillac 368 engine. I had a 1980 Seville with this engine. It was the smoothest, quietest engine I have ever experienced. I have a 95 LT-1 Fleetwood and I have had a 1971 472 sedan deville. Both of those are much more powerful, the LT-1 giving me the best performance and mileage, but you could have balanced champagne glasses on the Seville hood with that 368. At full throttle, it was a whisper. The power was good enough to move the Seville pretty fast around town, with more flooring necessary to maintain highway speeds (no overdrive in 80). It is much faster than the 4100 and faster than the Fullsize 77 Grand Prix that I had with a 301. The only con is the fact that electronics, like the Throttle Position Sensor (TPS) is unique to 1980 and is not produced anymore. A NOS one is $250 and very rare. On another note, 1980 is a horrible paint year. GM used dispersion lacquer and it gets massive alligator cracks if you attempt to paint over it. The whole car has to be stripped to respray any part of it.

  8. #38
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    Re: 6.0 368 pros and cons

    Jed95fwb I bought a 1980 cdv last fall,24000 miles on it,368,this motor suits me fine,everything is comparable, I've never driven any other big blocks, I was interested in your seville having no over drive,I havent checked everything out yet on my car,do you know if cdv had o/d?. the paint on my car is in great shape,most people think it's had a new paint job,wonder if seville's were painted in a dfferent factory?. Ken

  9. #39
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    Re: 6.0 368 pros and cons

    Cadillacs did not get overdrive until the 4.1L V8 was introduced in '82.

  10. #40
    creeker is offline Cadillac Owners Connoisseur
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    Re: 6.0 368 pros and cons

    Kinda ironic,with an advancement like overdrive coupled with the 4.1.

  11. #41
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    Re: 6.0 368 pros and cons

    Quote Originally Posted by creeker View Post
    Kinda ironic,with an advancement like overdrive coupled with the 4.1.
    Not really.... The HT4100 in itself was a very advanced engine for the time, digital fuel injection and on board diagnostics among others. HT stands for High Technology. It was underpowered in the full size cars, and later in life proved to not be very reliable.... but at the time, with the gas crisis on hand and everything going on, it was what they needed. An HT4100 w/ OD will get about 24mpg on the highway....in the early 80's, that was amazing... compare to just a few years before, you had my '79 DeVille w/ 425 and no OD getting 17mpg tops.

  12. #42
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    Re: 6.0 368 pros and cons

    It's like if Cadillac somehow made a '92 deVille that could get 32MPG on the highway, not the 25 that mine does. Amazing!!

  13. #43
    linearone is offline Cadillac Owners Member
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    Re: 6.0 368 pros and cons

    Quote Originally Posted by Jed95fwb View Post
    Greetings,
    It might be a little late, but I wanted to comment on the Cadillac 368 engine. I had a 1980 Seville with this engine. It was the smoothest, quietest engine I have ever experienced. I have a 95 LT-1 Fleetwood and I have had a 1971 472 sedan deville. Both of those are much more powerful, the LT-1 giving me the best performance and mileage, but you could have balanced champagne glasses on the Seville hood with that 368. At full throttle, it was a whisper. The power was good enough to move the Seville pretty fast around town, with more flooring necessary to maintain highway speeds (no overdrive in 80). It is much faster than the 4100 and faster than the Fullsize 77 Grand Prix that I had with a 301. The only con is the fact that electronics, like the Throttle Position Sensor (TPS) is unique to 1980 and is not produced anymore. A NOS one is $250 and very rare. On another note, 1980 is a horrible paint year. GM used dispersion lacquer and it gets massive alligator cracks if you attempt to paint over it. The whole car has to be stripped to respray any part of it.

    http://www.partsamerica.com/ProductD...pe=280&ptset=A

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