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  1. Cadillac 425 Performance Question

    500, 472, 425, 368
    Hi all, So I acquired a 9k original mile 1978 Eldo Biarritz Custom Classic last year and finally got around to tinkering with it. When I bought the car it was a complete dog. If I floored it, I couldn't feel any difference at all. This was even after I changed the plugs/wires/dist cap/rotor...
  2. I think I know how you HT4100 owners feel.

    RWD 19xx-1984 DeVille and Fleetwood,1985-1996 Flee
    For work, I drive a 2000 Chevrolet Astro AWD LS passenger van. It has 224k on it right now, it runs great, and on any given time, I've got about 1500 lbs of product in the back of it (everything aside from the front seats is removed). It's 4.3L V6 makes 190hp and 250 lb/ft of torque....which...
  3. Overdrive for a '79 425?

    500, 472, 425, 368
    Did Caddy ever mount a 700r4 to the big blocks? I just put a 425 into a Jeep truck and was wondering what my options would be as far as getting an OD that has the Caddy BB bell. If they did use a 700, I could swap tail shafts and still use a t-case on it. :D If anyone has any info, I would...
  4. 425 Caddy stroker motor

    500, 472, 425, 368
    Has anyone ever installed a 500 Cadillac off-set grind stroker crank in a Caddy 425 block/motor? The bore size is of course smaller than the 472/500, but the block is lighter and may make a good candidate for a strong street motor. 500 Caddy motors are still relatively common and inexpensive...
  5. 79 425 stuck in high idle

    RWD 19xx-1984 DeVille and Fleetwood,1985-1996 Flee
    Had to run an errand this evening, car was sitting all day, got in, accidentally jammed the accelerator a bit hard before turning the key, car started fine, BUT, after driving a short distance, the idle never calmed down to the normal low RPM as it always does. Got to my destination, car was...
  6. The epic journey around USA

    Informal Lounge, Introductions, General Discussion
    On July 24, 5AM I am leaving Toronto for a 3 weeks round trip around USA. It will be a 10016 miles drive in 21 days (435 miles per day every day). Here are the points to reach (day by day): 1. Toronto>QEW>403>401 >Detroit>I94>I90>Chicago 2. I80>Omaha>I29>Sioux Falls>I90>Rapid City 3. Mount...
  7. 425 Qjet jet size for dual exhaust

    500, 472, 425, 368
    Anybody know the stock jet size for a '79 Cad with original Q-jet? Mine has had dual exhausts installed before I got it- used stock Y pipe (due to crossmember, I suppose), then dual pipes, no cats. I doubt they re-jetted the carb, but would guess it may need it, might be a bit lean. Should I go...
  8. Air cleaner intake hose (flex duct) on 425 engine

    RWD 19xx-1984 DeVille and Fleetwood,1985-1996 Flee
    I got a brand new air cleaner intake hose recently for my '78 Sedan Deville. I noticed,when taking off the old one,that the old one has "2 deliberately placed oval shaped cut out openings" on the underside.These 2 openings are about 1-1/2 inches around.Since the old air hose is original,these 2...
  9. Location of oil passage 425 head - pics?

    500, 472, 425, 368
    I pulled the valve covers on my '79 425 last week to replace the gaskets, and to my dismay found mucho sludge......just got the car about 6 months ago. I cleaned the valve covers well and tried to find the oil passages in the heads (think they are in the rear by firewall) but was never sure I...
  10. 425 engine w/ 454 TBI program?

    500, 472, 425, 368
    Hey all, nice forum you have here. I am not going to lie to anyone here, I'm a dedicated Jeep fan. I own 13 Jeeps in various states of restoration. With that many, I am in the need for something that can haul these around from time to time. A friend gave me the 425 and TH400 out of his '79...
  11. Cadillac 425 engine--does it need ZDDP?

    RWD 19xx-1984 DeVille and Fleetwood,1985-1996 Flee
    Does the Caddy 425 engine need ZDDP? I read someplace that the older engines need it.True or not.
  12. Help with 425 vacuum lines..

    500, 472, 425, 368
    Hello all, first the facts. Last year i purchased a 78 coupe deville, that took me about 15 months to import to Brasil. Today i was checking the car, idle is extremlly high when the car is cold, after 10 minutes goes a little lower, parking brakes will not release when engage "D", brakes are...
  13. 1954 Ford Bus with Caddy 425

    500, 472, 425, 368
    My uncle gave me the bus he's had since 1974. It currently has a Caddy 425 in it. I am told that the motor came from a Hearse. What years would this motor have been offered? I need to replace the head gaskets, valve seals, and lifters. What are my options for intake manifolds with this motor...
  14. Starter issue 425

    500, 472, 425, 368
    I recently purchased a '79 FWB. The starter works, but it grinds and sounds like an early chevy v8. I have owned these Cads before and never had one sound like this. Could it be a starter with the wrong drive gear?
  15. '78 Deville 425 carburetor vent question.

    RWD 19xx-1984 DeVille and Fleetwood,1985-1996 Flee
    I was cleaning the exterior of my 425 carb today and noticed a tube on the front of the carb-----apparently it`s a vent tube according to my chiltons manual. Does the tube get clogged over time and IF it does get clogged----can it be rodded out to clear it out?
  16. '78 Deville 425 carb vent question

    500, 472, 425, 368
    I was exterior cleaning my 425 carb today and noticed a tube on the front of the carb---apparently it`s a vent tube according to my chiltons manual. Does it become clogged over time and can it be rodded out IF it becomes clogged?
  17. 425 Valve cover gaskets

    500, 472, 425, 368
    I recently bought a '78 Deville 425-------my mechanic says it needs new valve gaskets,they are leaking a bit---he wants $250 including labor.I could do them myself but passenger side cover has an AC line running directly over 1 end of it. Might be a real hassle doing it myself. Anyone here ever...
  18. 1978 425 v-8 Deville---carbureted or FI.

    RWD 19xx-1984 DeVille and Fleetwood,1985-1996 Flee
    Hi, Was the 1978 Caddy Deville 425 v-8 carbureted or fuel injected? Thanks
  19. 77 fleetwood 425 turbo ?

    500, 472, 425, 368
    Would love to turbo the ol` girl. Any turbo kits available for these engines ?? What should be done to the motor to handle the turbo. Streedriven only .thanks mike
  20. 425 Rocker Arms

    500, 472, 425, 368
    Hey all, I removed heads to remove broken ex. manifold bolts. Put everything together and rockers tapping very loud when I pulled heads everything was quiet. I used proper torque specs. I'm concerned with the rocker retainers can I use a shaft system on the heads.
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