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KNOCK, KNOCK, KNOCK... DAMN!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by KRAZIE87K5, Oct 3, 2001.

  1. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Thought I had a nasty exhaust gasket leak on the pass. side today. But after working on it until 10pm, I now know its something else. I replaced the gaskets ,the plugs, and the temp sender. Still there is a noise. So I pull the valve cover, and start checking lash. The #8 exhaust rocker felt really loose, but was tightened just as far as all the other rockers. So I re-lash the entire passenger side of the engine, and the DAMN knock is still there! [​IMG][​IMG][​IMG][​IMG]

    Vote here:
    #1 - Bent pushrod
    #2 - Collapsed lifter
    #3 - Bearings

    D@MNIT! Sorry... this makes me mad. Not only that, but now after it being 70 degrees today, its only supposed to be 50 the rest of the week! Collapsed lifter would be better than all other options, because then I would have a good excuse to change out my cam. But this still sucks!

    I will take out the pushrods ASAP, and let everyone know what I find. Does anyone have any experience with 454's doing crappy stuff like this?

    (The motor has brand new cam and lifters, < 3000 miles ago)

    <font color=red>Just give me a tank, and point me in the right direction!</font color=red>
    <font color=blue>DONT MESS WITH AMERICA!</font color=blue>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
     
  2. jimmyjack

    jimmyjack 1/2 ton status

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    Since its #8 you could very well have a bad lobe on your camshaft. Ive had two bad cams and both times it was #8.

    That jeep thing? Yah I understand it....... Like my Blazer? <a target="_blank" href=http://community.webshots.com/user/blazerk5>http://community.webshots.com/user/blazerk5</a>
    Jim
     
  3. BurbinOR

    BurbinOR 3/4 ton status

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    My 396 in my '71 Camaro did something similar..........turned out in that case to be the pushrod guide plates being incorrectly sized for the 7/16" pushrods, and bent. Gotta have a matched valvetrain I found............had very stiff valve springs, the 7/16" pushrods and the stamped steel pushrod guide plates. Ended up putting in the good guide plates and all new pushrods and all was well. Hope your's is as simple as mine was. Keep us posted.


    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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    It's a big block so I'm saying rounded cam lobe.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  5. Speed-demon

    Speed-demon Registered Member

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    454's are notorios for eating cams, they don't get proper oil distrabution in the valley, you can either run a oiler line up into the valley or simply put molyslip into your motor. It is a oil additive that has molybdenum disulfide in it. The best antifriction lubricant known to man! I do torque tensioning at work with hydraulic wrenches and on my Engineering table of torque values for diffrent greases, moly is the first in line.
     
  6. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Yeah, numbers 7 and 8 cylinders are known as the bad ones. [​IMG]

    But, there is a solution to getting more lubrication to those back areas. Check out <a target="_blank" href=http://www.off-road.com/chevy/reviews/bbc_oiler/>http://www.off-road.com/chevy/reviews/bbc_oiler/</a>.


    <font color=red>I'm a "black top mudder"!!!</font color=red>

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>http://coloradok5.com/gallery/thatK30guy</a>
     
  7. muddin4fun

    muddin4fun 3/4 ton status

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    I was wondering if you could have a bad lifter (and might have caused a worn lobe)

    <font color=blue>Women should put pictures of missing men on beer cans...</font color=blue>
    Website link is in my profile [​IMG]
     
  8. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Sniffle... Sniffle... (CRYING)... [​IMG]
    Don't say a flat cam lobe... SOB! I guess I will be taking it apart right now, I stayed home from work to check it out.

    If its the cam lobe deal, I will have to retire the truck for a little while until I have the $$$ [​IMG] I have spent too much money on this damn thing in the last month.

    Rear disc, crossover steering, new bumpers, windsheild, on and on... and she still has enough nerve to blow the freaking cam! Can you believe that??!!!!

    <font color=red>Just give me a tank, and point me in the right direction!</font color=red>
    <font color=blue>DONT MESS WITH AMERICA!</font color=blue>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
     
  9. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Well, just be thankful it was not something worse, like a blown motor or tranny!! [​IMG]

    Just take your time fixing everything and do it right the first time. Pic the right cam this time that will make you happy. [​IMG]

    <font color=red>I'm a "black top mudder"!!!</font color=red>

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>http://coloradok5.com/gallery/thatK30guy</a>
     
  10. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Well the vavle covers are off, the rockers are off, the pushrods are straight as arrows... [​IMG][​IMG] I have pulled the fuel system, and the other side vavle train, and OF COURSE it starts to rain! I will have to drain some rad. fluid out, remove the ALT and the PS, balancer, blah blah blah... I will let everyone know what the cam looks like once it is removed...

    THIS SUCKS!

    Speaking of the "RIGHT" cam... would anyone like to tell me which cam I should buy this time? The last Compitition Cam's cam was not the "RIGHT" cam at all... I want MASSIVE off-idle torque, but still keeping as much HP as possible. I will answer any questions so I get the "RIGHT" cam this time around...

    <font color=red>Just give me a tank, and point me in the right direction!</font color=red>
    <font color=blue>DONT MESS WITH AMERICA!</font color=blue>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
     
  11. CaptCrunch

    CaptCrunch 1/2 ton status

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    Who recomended your comp cam size? I have had excellent luck in street applications w/ their tech assistance. My other personal favorite is Crower but they are pretty spendy. Lunati is another good company IMO but they do have less grinds them some other manufactures. How old is this motor? It might be worth ripping apart and doing some mods to the oiling system. There are numerous mods you can do to aid the oiling and/or add an aux. oiler. Also I would strongly suggest going to a roller cam. It will cost more but will live much longer.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  12. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Roller? Yeah - cost a LITTLE MORE... no way will I convince the wife to spend $400 vs $150... Good luck with that one!

    Anyhow - I still havn't gotten to the cam yet, the rain is still coming down and now THE WIFE is putting me to work in the house... Maybe tomorrow...

    <font color=red>Just give me a tank, and point me in the right direction!</font color=red>
    <font color=blue>DONT MESS WITH AMERICA!</font color=blue>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
     
  13. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Check out the Non forum...Solowookie posted a link to an engine analyzer program that will help you find the right cam for what you want that bad boy to do. It's not Desktop Dyno but it sems fairly accurate.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  14. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Dan, the right cam depends on what you want the motor to do.

    Let me tell you about the right cam in my opinion. [​IMG]

    Have you ever driven one of those "big boat" cars from the 70's? How about station wagons weighing around 6000 lbs.? I have owned a station wagon with a BBC, in stock form, and two other "big boat" cars, both with big blocks in them, but not Chevy's.

    Ok, now when you were driving one of these cars, did you ever notice how much power they had? Did you ever notice how easy they were to step on the gas and let off, repeatedly to watch and feel the front end of the car jump and bounce up and down? Did you ever notice how these heavy cars can fly down the highway, 100 mph or more, easily?

    Well, if you have ever experienced those cars, think about the cam in them stock motors. Yeah, stock!!! [​IMG]

    Now, think about one of those stock cams like in the 6000 lbs. car in your motor in the Blazer. Think about what your Blazer could do that the cars did. It would idle very smoothly, run great, have lots of power, go fast, and just about anything else many other "bigger, over-sized" cams cannot do.

    Thats what I would do and am going to do to the 454 in the K30 I got from Shawn. Basically make it a "sleeper" and blow everyone away!!! No doubt, this type of cam should be able to do the difficult tasks that I will throw at it!! [​IMG][​IMG]

    <font color=red>I'm a "black top mudder"!!!</font color=red>

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>http://coloradok5.com/gallery/thatK30guy</a>
     
  15. jimmyjack

    jimmyjack 1/2 ton status

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    If its a flat lobe I'd anticipate alot of debris in your oil pan and your bearing are probably pretty scored too. I always had good oil pressure but it would to around 10 lbs at idle when it warmed up after I burned my camshaft. Good luck. Hope everything works out!

    That jeep thing? Yah I understand it....... Like my Blazer? <a target="_blank" href=http://community.webshots.com/user/blazerk5>http://community.webshots.com/user/blazerk5</a>
    Jim
     
  16. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Thats the part I don't understand too... the oil pressure is ALWAYS above 40lbs. I don't know how the cam could have been under oiled except that it seems to be some sort of issue for BBC engines [​IMG].

    Wes - I hear that! I would like a cam that runs smooth, lotza power off idle, and decent top end. But nothing that winds up too high, 4500RPM max is fine by me. I think I may just call a few manufacturers of cams and see what they suggest for my beast.

    I hope it has not done too much damage internally [​IMG] I do not want to have to pull the damn engine to fix this problem. If I have to pull it - god only knows if I will have it back on the road for winter. [​IMG]

    I hope that I pull the intake and find a broken tappet. I really hope that I don't open the thing to find a mangled lifter bore and a crapped out rear cam bearing...

    Talking about the poor engine like this is annoying!

    <font color=red>Just give me a tank, and point me in the right direction!</font color=red>
    <font color=blue>DONT MESS WITH AMERICA!</font color=blue>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
     
  17. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Wes,

    My Comp Xtreme 4x4 makes insane amounts of torque which peaks at 3,000 RPM according to DD 2000. It has a rock solid idle and makes far more power than a stock engine. Your engine has to breathe. Stock cams come close on duration/overlap/LSA, but don't have the kind of valve lift that makes good power.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  18. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Whats the PN of your cam? I want to run its numbers thru this engine software. Thanks!

    <font color=red>Just give me a tank, and point me in the right direction!</font color=red>
    <font color=blue>DONT MESS WITH AMERICA!</font color=blue>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
     
  19. chvyhs

    chvyhs 1/2 ton status

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    Stay away from the solid lifter cams, I have one in my 396 Chevelle. I'm constantly having to adjust my valve lash. I had a knocking sound on the drivers side a while back but I haven't heard it in a while. I take that engine all the way up to 7200 rpm. I have a NOS cheater system I'm going to install by next year. Hopefully no new Knocks start up after that's installed. I would install a mild RV toque cam. Keep us posted, I found a 454 I might get for my K5. How much more does the big block drop the front of your K5? Good Luck.
     

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