Chevy 454 Question

Discussion in 'Domestics' started by morelach, Feb 9, 2017.

  1. nickb2

    nickb2 Wrench. I help when I can

    Joined:
    Nov 22, 2008
    Messages:
    7,891
    Likes Received:
    116
    Gender:
    Male
    Occupation:
    Diagnostic tech
    Location:
    St-Hyacinthe, Quebec, Canada
    No way Big al, I thought you were like 55 or something.

    You should come do some skidoo. At our age, we are still good.
     
  2. nickb2

    nickb2 Wrench. I help when I can

    Joined:
    Nov 22, 2008
    Messages:
    7,891
    Likes Received:
    116
    Gender:
    Male
    Occupation:
    Diagnostic tech
    Location:
    St-Hyacinthe, Quebec, Canada
    @big al, when I got into the drag scene, I over bored a 302 to easy 375hp


    I went 40 over on the piston and and went full roller on the cam.

    What a thrill. Nothing compared to my pontiac lemans 1971.

    Anyway. Wish I could have short blocked a 454 motor home engine and put that in my 71 lemans. I think I would have done easy 12sec runs.
     
  3. nickb2

    nickb2 Wrench. I help when I can

    Joined:
    Nov 22, 2008
    Messages:
    7,891
    Likes Received:
    116
    Gender:
    Male
    Occupation:
    Diagnostic tech
    Location:
    St-Hyacinthe, Quebec, Canada
    Again, @ big al check out some "pont rouge" drag videos on you tube, maybe you will see my blue eagle talon or that red stang. Those were the good days.

    What a trip

    After that, I tripped out on some nissan stanza's with timing chain. Those could take a heavy beating.:D:eek:
     
  4. nickb2

    nickb2 Wrench. I help when I can

    Joined:
    Nov 22, 2008
    Messages:
    7,891
    Likes Received:
    116
    Gender:
    Male
    Occupation:
    Diagnostic tech
    Location:
    St-Hyacinthe, Quebec, Canada
    I don't know, but I think this is me going down the strip up in quebec.

    Nope, That was an epic fail from dave.

     
  5. billr

    billr wrench Staff Member

    Joined:
    Mar 12, 2007
    Messages:
    5,855
    Likes Received:
    59
    Take compression, too. Let's see if there are any really obvious problems. A broken/weak valve spring is another thing I would consider.
     
  6. morelach

    morelach Newbie

    Joined:
    Feb 9, 2017
    Messages:
    6
    Likes Received:
    0
    Yep! Sure do.


    Sent from my iPhone using Tapatalk
     
  7. Mobile Dan

    Mobile Dan wrench

    Joined:
    Mar 1, 2002
    Messages:
    3,207
    Likes Received:
    34
    Gender:
    Male
    Location:
    Kentucky
    A valve spring problem, as Bill mentioned, is something I had considered. Your definition of "under load" may need better definition. Popping due to spring problems happens at high RPM, and loudest "with the hammer down".
     
  8. LynnM

    LynnM Sr. Member

    Joined:
    Nov 16, 2006
    Messages:
    206
    Likes Received:
    2
    Long steep hill under load could cause it to go lean for a lack of fuel.. , instant pinging maybe a fried piston. I would put an electric pump on it..
     
  9. jd

    jd Hero Member

    Joined:
    Jan 14, 2007
    Messages:
    417
    Likes Received:
    16
    I'd like to be told positively that it's Carb or it's TBI. A "1988 motorhome" can be on a 1988 chassis, but could easily be 1987, or occasionally even earlier.

    A 454 wound out, climbing a steep grade, needs 25 gallons/hour. Fuel pump, fuel filter, fuel return line... I like the possibility of an intake air leak, leaning it out. Could be EGR like Nb2 said, intake manifold gasket, carb/TBI gasket...
     
  10. nickb2

    nickb2 Wrench. I help when I can

    Joined:
    Nov 22, 2008
    Messages:
    7,891
    Likes Received:
    116
    Gender:
    Male
    Occupation:
    Diagnostic tech
    Location:
    St-Hyacinthe, Quebec, Canada
    @jd. yeah, me to I would like to know, because in those years for those chassis, they just started to introduce EFI.
     
  11. PC

    PC Full Member

    Joined:
    Sep 3, 2007
    Messages:
    104
    Likes Received:
    0
    Did you check for clogged fuel filter? How about cap ,wires and rotor? Seem to recall some HEI rotors burning through the carbon button. Is it running hotter than usual? Another thing, are they putting corn juice, ethanol, in your gas? Just went through a Rochester 2 barrel twice in 2 years due to ethanol, ate up the float.
     
  12. NickD

    NickD wrench

    Joined:
    Aug 28, 2007
    Messages:
    4,609
    Likes Received:
    15
    Got one of these, timing marks in the bottom, distributor is on the top, cylinder #8 is where your you hook up your timing light to, also need some one on top to adjust it. Not sure about your 88, mine has the old HEI distributor with the vacuum advance, that has to be disabled first. Not even sure how this thing ran when I got it, was 30 degree off.

    Don't even want to think about water in the tank, sure had a lot of rain up north, stalled in the rain in the middle of nowhere. Good I also have a electric fuel pump, had to crawl under, remove a fuel line, have my wife my switch on the pump, spilled that water on the side of the road until gas came out. This got us going again. Bot tanks had water, just did the front one, rear one when we go home.

    Sure can't put E10 in these things, never heard about this stuff when these things were made will also mess up your generator if you have one. Sure messed up my 88 Supra, for awhile, this is all we could get.

    Reminds me to order a conventional oil dipstick, mine needs new exhaust manifold gaskets, no way to remove the one in there, goes clear forward to the top of the radiator for convenience, was put in before they built a motorhome on top of it. Just have to pop off the engine cover to check it.
     
  13. NickD

    NickD wrench

    Joined:
    Aug 28, 2007
    Messages:
    4,609
    Likes Received:
    15
    Craigslist around here are loaded with these things can't even give these things away, RV dealers around here charge 125 bucks an hour, campsites are 30-40 bucks per night, but we go in the wilderness. Purchased our 11 years ago, and if I deduct what the last guy put into with all brand new parts, paid only 1,500 bucks for it, only had 39K miles on it. Sit around more than they are used, had to redo the entire engine electrical system.

    For one thing, had three brand new batteries, negative battery terminals connected together, and of all places tied to an engine shield ground, made a new cable to tie that to the engine block, then another directly to the chassis. 12 volts for that firewall connector using all those unplated brass Packard Electric spades ran clear down to the starter terminal and back again, when it was only a foot away, had to clean up that corroded mess.

    Could have spent a couple bucks more and purchased a newer one, but with my kids and own crap, had plenty of EFI stuff around here to drive me nuts. With this thing, battery, fuse, ignition switch, firewall, just one wire goes to the HEI, simle, not a million transistor for that same route. Pulled the HEI, top bearing is always worn, pressed in a new one I had laying around, and properly soldered the two wires to the trigger coil, GM never did this right. The list goes on.

    Do like having that Owen generator, sure got a ton of rain here last fall, electric power went out for several hours, just ran an extension cord to my basement sump pump. Also handy to have when our congress picked on that 3/8" high pilot light, never lost natural gas, but with a 75 year old electrical infrastructure, these failures are common, can't even switch your furnace on to least get some heat. Don't have to run that generator constantly, just enough to keep my basement dry and that we don't freeze to death.
     

Share This Page