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05-01-2015, 04:18 PM | #1 |
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Re: 1971 C-10 knocking sound and not reving past 3000 RPM
If you get lucky and it's just the lifter, it is my understanding you should replace all of the lifters. There's also a school of thought that you must put in a new cam along with the new lifters. Pull the rocker arm off the bad lifter and pull out the push rod to see if it is bent.
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1970 C10 Short Stepper with 71/72 front clip. |
05-01-2015, 11:55 PM | #2 | |
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Re: 1971 C-10 knocking sound and not reving past 3000 RPM
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05-01-2015, 02:59 PM | #3 | ||
"I ain't nobody, dork."
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Location: Whidbey Island, Washington
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Re: 1971 C-10 knocking sound and not reving past 3000 RPM
Like Bugz said... check to make sure it's not a "collapsed" lifter. You can just pull it out of it's bore. But if you pull it and the bottom is eaten away like this:
Then you have worn cam lobes and there will be lots of trash in the oil. Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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05-01-2015, 03:30 PM | #4 |
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Re: 1971 C-10 knocking sound and not reving past 3000 RPM
You need to remove the intake manifold to get to the lifters on a small block , check to see if the pushrod is bent or the rocker stud is lose first , either can cause this
not changing the oil will cause flat cam lobes
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68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive |
05-01-2015, 03:32 PM | #5 |
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Re: 1971 C-10 knocking sound and not reving past 3000 RPM
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05-01-2015, 05:46 PM | #6 |
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Location: Boulder, CO
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Re: 1971 C-10 knocking sound and not reving past 3000 RPM
it sounds like it's 'time' to look at the innards. A 40+ year old truck probably needs some sort of attention, more involved than plugs and an oil change. Unless I have definite history on a vehicle, I assume the worst possible maintainence has been done, and inspect accordingly. If the 'worst case scenario' doesn't present itself, I am one happy SOB. If you don't think you're up to the challenge, there's plenty of help, here on the board. There is probably no situation that some one of us hasn't dealt with, and overcome, usually successfully!
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05-05-2015, 08:29 AM | #7 |
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Re: 1971 C-10 knocking sound and not reving past 3000 RPM
I, too, have decided- no more carburettors, unless it's a vintage motorcycle. The '69 GMC is getting a TPI SBC, the '71 Cheyenne is getting an LS and the jury's still out on the '70 C10. I love the 'old stuff', but I am not a stranger to technology. For a truck that's going to see regular/daily driver use, an LS conversion makes sense, the expense is going to be there, either way- and the 'old tech' stuff has maintainence costs that the 'new tech' stuff doesn't. I vote- LS! I was fortunate (or cursed) to have been in the auto service biz from the time of points and drum brakes and carburettors to all this high- tech (and reliable) stuff. And I am grateful for that.
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05-05-2015, 09:09 AM | #8 |
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Re: 1971 C-10 knocking sound and not reving past 3000 RPM
Hey now fellers, carbs go with manual brakes and manual steering! OLD SCHOOL ALL THE WAY!!!
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Thanks, Joe.. 1969 C/10, 348 C.I., 3X2 bbl. V8, 2004r , LWB. |
05-05-2015, 02:58 PM | #9 |
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Re: 1971 C-10 knocking sound and not reving past 3000 RPM
Old skool is nice, I've got a '35 Plymouth PJ than is all original except paint colour. Daily driver- no. My '72 Triumph Bonneville is 'old skool', except for the transitorised ignition, gel battery and resleeved Amal carbs. I'm not going to go across country on it, though. The trucks will get used regularly, and so, concessions to modernity will be made. That's how I roll. Or eye roll, 😈
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