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#26 |
Registered User
Join Date: Feb 2007
Location: knoxville tn
Posts: 1,013
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Re: camshaft won't last wtf !!!!!
Ok so your saying that they checked the retainer to valve guide clearance
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nickle and dime |
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#27 |
Registered User
Join Date: Mar 2007
Location: st louis,mo
Posts: 313
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Re: camshaft won't last wtf !!!!!
Here is some more reading on oil. http://www.lnengineering.com/oil.html
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'79' shortbed |
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#28 |
Registered User
Join Date: Aug 2003
Location: southeast missouri
Posts: 74
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Re: camshaft won't last wtf !!!!!
Well after the machinist has checked everything from top to bottom on the heads and after careful inspection of the lifter bore, I swapped sides of the engine with the heads and got a used cam and lifter set with 5000 miles on it from a good friend, installed the cam and lifters ( matched to the lobes that they came from) with LUCAS cam lube and Valeline 20w-50w oil. When the engine fired up it started poping through the exhaust again so I shut it down waited a few minutes and fired it up again and the popping was not as bad but still there. Shut it down again, then fired it up after about 10 mins. and the popping was gone and the engine is running great. So I have not found out a damn thing, but my engine is running good with no issues. The used cam is a Lunati voodoo series and I got it CHEAP. Anyways I'm going to the track to see how it runs and will check back later. Thanks for everyones help and opinions as they are greatly appreciated, Later Kirk...
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Kirk Myers 68 chevy swb owned since 87, under the knife 71 skylark 9.20's @ 76mph 1/8 mile |
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#29 |
Built 4 Speed
Join Date: May 2008
Location: Geneva FL
Posts: 619
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Re: camshaft won't last wtf !!!!!
good luck.
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1969 C/10 Short Box: 496/T-56 in worx. ![]() "To Be Old And Wise, First You Must Be Young And Stupid" |
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#30 |
Registered User
Join Date: Aug 2003
Location: southeast missouri
Posts: 74
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Re: camshaft won't last wtf !!!!!
The old '68 was running good last week, but I started it this morning and what do you know, it started popping thru the exhaust and then started backfiring thru the carb. I don't know what else to do other than swapping heads. The heads that are on the truck have bronze valve guide sleeves. They are not the all bronze guides. Could these be giving me this problem. Later Kirk
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Kirk Myers 68 chevy swb owned since 87, under the knife 71 skylark 9.20's @ 76mph 1/8 mile |
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#31 |
Registered User
![]() Join Date: Oct 2006
Location: Southern Kalifornia
Posts: 3,066
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Re: camshaft won't last wtf !!!!!
do your valves look scorched on the stems? if so they could be starting to seize on the stem/guide liner. Good Luck
-Lance
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------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT |
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#32 |
KOFFIN DRAGGER
Join Date: Jan 2008
Location: st.anthony Idaho
Posts: 864
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Re: camshaft won't last wtf !!!!!
The problem is the valve spring, I had the same problem. I had one spring that was alot stiffer than the others, I wiped 13 cams out and CRANE bought all 13 till the problem was solved with a new set of CRANE springs they bought. Mine would only last about 250 miles each before it was flat. on the #6 exhaust valve. I would have the machine shop, or you if you have a spring rate gauge tool, and check all they springs. I belive they should all be really close to the same, I dont recall the specs on mine. That truck has long since been sold, but still a daily driver on the same engine. Good luck and I hope this helps.
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If the life I live dont kill me, then I guess I'll never die! New updated stuff at www.kdrodworks.com My site still needs help, web guys and gals pm me. the best guys in the whole world: sweet70beast, jonzcustomshop, runninlow, captainfab, and the one I havent met yet, joe231 |
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#33 |
Registered User
Join Date: Aug 2003
Location: southeast missouri
Posts: 74
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Re: camshaft won't last wtf !!!!!
Well Summit warantied the cam and lifters and sent me a new cam kit. The valve stems and guides looked ok when at the machine shop. Its goning to be a while before I can get back to the ol' 68 do to lots of overtime on night shift, so I'll update in a couple of months. Later Kirk
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Kirk Myers 68 chevy swb owned since 87, under the knife 71 skylark 9.20's @ 76mph 1/8 mile |
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#34 |
Registered User
Join Date: Dec 2006
Location: POWNAL VERMONT
Posts: 343
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Re: camshaft won't last wtf !!!!!
after reading all the post my 2 cent's would be the spring's are bad.iwould try a new set i've seen this problem a few time's with what they call z28 spring's buy the complete set of (cam, lifter's, spring's) and see what that doe's
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1972 c-20 chevy 500 caddy/4.10posi / 1972 3/4 ton gmc 350 4x4/4.10posi front&rear ![]() ![]() ![]() |
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#35 |
Registered User
![]() Join Date: Jul 2008
Location: Olive Branch,Mississippi
Posts: 347
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Re: camshaft won't last wtf !!!!!
I ate two cams and two sets of lifters in the past 1 1/2 months and it was popping like you said yours is and found out the lifter pockets are not working correctly and ate up 4 and 5 cylinders both times
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#36 |
Registered User
Join Date: Feb 2001
Location: Wetumpka, Al, U.S.
Posts: 8,891
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Re: camshaft won't last wtf !!!!!
What's a lifter pocket
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Kevin Special Thanks to All who have helped on the TRUCK! My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4 So Far my best Times are: Motor only: 6.44 1/8 @ 104.13 10.39 1/4 @ 125.83 Nitrous Times: 5.785 1/8 @ 118.65 with a 1.336 60ft 9.168 1/4 @ 142.58 with a 250 shot dead out of the hole! |
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#37 |
Built 4 Speed
Join Date: May 2008
Location: Geneva FL
Posts: 619
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Re: camshaft won't last wtf !!!!!
^
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1969 C/10 Short Box: 496/T-56 in worx. ![]() "To Be Old And Wise, First You Must Be Young And Stupid" |
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#38 |
Registered User
Join Date: Jul 2008
Location: Orange,Texas
Posts: 99
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Re: camshaft won't last wtf !!!!!
I had a similar problem years ago with the valve guides being to tight on one cylinder. It ended up with both valves seized in the open position, wiping out the cam, both lifters, both push rods, the piston, con rod, crank, pretty much went from the burn out box to the tree and locked up. Anyway, the machine shop bought everything but the block. Dart makes a killer block. Make sure you research your local machine shop before you give them all those expensive parts.
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#39 |
Registered User
![]() Join Date: Jul 2008
Location: Olive Branch,Mississippi
Posts: 347
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Re: camshaft won't last wtf !!!!!
Block problems,where do they go?My borrowed block did not work right,I'm giving it back ,mines in the machine shop, don't like 60 over but go or blow,
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Built chevy tuff! ![]() Last edited by Rodms; 10-08-2008 at 10:18 PM. |
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#40 |
Registered User
Join Date: Jul 2005
Location: Saskatchewan
Posts: 189
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Re: camshaft won't last wtf !!!!!
Had the same problem with my 355. When I installed the freeze plug in the back of the block (the one by the last cam journal) I drove it in too far preventing the cam from going far enough back in the block.
I killed 2 cams before getting frustrated enough to get a second opinion. Pulled the motor, took it to the shop I bought my parts from and they diagnosed it.
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Stu- 1981 GMC Sierra Classic LWB 355- original 2 bolt block, 10.2:1, vortec heads, Comp XE268 cam, built by self in 1992 700R4-2000 stall with lockup, shift kit, Corvette servo 3.07 open diff- I need a 3.73 posi! 2nd owner since 1986 - 388,000 km and counting. 100k by the first owner and the rest by me. |
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#41 |
Registered User
Join Date: Mar 2007
Location: Connecticut
Posts: 581
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Re: camshaft won't last wtf !!!!!
Any updates?
kamkam I would carfully examine the rocker arm slot, make sure it has enough travel without binding. Rocker stud bent? Check the rocker ball under the nut, how is the mating surface? Maybe the lifter bore needs honing?
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"I'll Procrastinate Tomorrow" quote by LEEVON 71 K10 long fleet (sons truck) new 370hp 355, sm465 np205, 3.73's 33's 70 K20 long fleet 98 G3500 work van |
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#42 |
Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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Re: camshaft won't last wtf !!!!!
What about break-in rocker arms?
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#43 |
Registered User
Join Date: Jul 2006
Location: the netherlands europe
Posts: 4,335
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Re: camshaft won't last wtf !!!!!
just keep the parts together the ball part to the dish part of the rocker , should be ok oh keep the pushrod and everything below it to the same rocker as whell , its a little extra work keeping it at the spot you take the part out of but its a little extra insurance at no extra costs
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i got a job again and having fun at it too idea's for the trucks and the order of things to do are taking shape and get closer to being realized , a few more months and i be able to start building for real i complete 2 of the trucks intoo running fashion one custom and one basicly stock the thirth will be sacrificed for parts |
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#44 |
Registered User
Join Date: Nov 2008
Location: Ponder, Texas
Posts: 94
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Re: camshaft won't last wtf !!!!!
Check out Brad Penn 1 racing oil. Good Luck
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#45 |
Senior Member
Join Date: Jul 2006
Location: Blountville, Tn.
Posts: 3,904
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Re: camshaft won't last wtf !!!!!
Did you ever get this problem fixed? What type of valves are you using? If your using stainless steel valves with out bronze valve guides. It is possible the two metals are fighting each other and binding up as it gets hot. Stainless doesn't like regular valve guides.
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*We could learn a lot from crayons... Some are sharp; some are pretty;and some are dull. Some have weird names; and all are different colours;but they all have to live in the same box. * You may be only one person in the world, But you may also be the world to one person. * Some mistakes are too much fun to only make once. Two rules in life. 1. Never sweat the small stuff! 2. Everything is small stuff! Last edited by BarryB; 11-21-2008 at 05:10 PM. |
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#46 |
Registered User
Join Date: Aug 2003
Location: southeast missouri
Posts: 74
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Re: camshaft won't last wtf !!!!!
Well it’s been 11 years, but I finally figured it out. I put 1.6 rockers on exhaust valves, which caused coil bind. #7 and #4 exhaust valves have shims under springs and that compounds the problems. Cam lift was to close to spring lift max, so the 1.6 rocker caused the coil bind. Thank you everyone..
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Kirk Myers 68 chevy swb owned since 87, under the knife 71 skylark 9.20's @ 76mph 1/8 mile |
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#47 |
Senior Member
![]() Join Date: Jan 2011
Location: Hayes Va
Posts: 4,569
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Re: camshaft won't last wtf !!!!!
This is what I use on a non roller engine. Get it from my race engine builder. He uses it to break in all the flat tappet race engines. Works great and you really need to follow the instructions.
Jimmy https://performancebyie.com/blogs/ie...eak-in-oil-faq
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60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
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#48 | |
Registered User
Join Date: Nov 2011
Location: Omaha, Nebraska
Posts: 437
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Re: camshaft won't last wtf !!!!!
Quote:
I guess the take away is calculate total lift (I.e., cam lift + rocker lift), and see if you are close to the max lift for your springs. Finding you are close, (<.05?) measure everything precisely. How’d you figure it out?
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Travis' Tribute Truck - 65 C10 Frame Up Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=495073 |
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#49 | |
Registered User
Join Date: Nov 2011
Location: Omaha, Nebraska
Posts: 437
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Re: camshaft won't last wtf !!!!!
Quote:
I guess the take away is calculate total lift (I.e., cam lift + rocker lift), and see if you are close to the max lift for your springs. Finding you are close, (<.05?) measure everything precisely. How’d you figure it out?
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Travis' Tribute Truck - 65 C10 Frame Up Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=495073 |
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#50 |
Registered User
Join Date: Aug 2003
Location: southeast missouri
Posts: 74
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Re: camshaft won't last wtf !!!!!
Scottofksu, I was talking to one of my friends at work and he was telling me how much he liked big block chevys. We were just talking and I was telling him how good my small block ran and I mentioned the 2 cams wiping out the same lobes. We were discussing how it was built and when I mentioned the 1.6 rockers on the exhaust valves, it hit me, I never done the math to see if my springs would allow enough lift...
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Kirk Myers 68 chevy swb owned since 87, under the knife 71 skylark 9.20's @ 76mph 1/8 mile |
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