I need an old guy....
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
With the fake money I won on the 10:1 bet, I'll double it down on cam lobes. If you didn't lap the valves maybe something went wrong with the heads and valves while those holes weren't hitting right,but I'm goin' with the cam lobes.
EDIT. All the running problems these past months might have been the intake and/or it's gaskets the whole time. This might have leaned out the two cylinders in question burning the valves. CRAP. Current problem might be in the heads.
EDIT. All the running problems these past months might have been the intake and/or it's gaskets the whole time. This might have leaned out the two cylinders in question burning the valves. CRAP. Current problem might be in the heads.
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Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
Yea we will go through this motor again with a fine tooth comb.
Right now I'm prepping engine 3 for install. I decided that I don't want the fireball cam since it's a high performance street cam. Too high of rpm range and stuff. So I'm gonna quick switch it for my summit 5200 rv cam that I have. More suitable for my truck use.
I've got this weekend off work so this is what I'm doing.
Right now I'm prepping engine 3 for install. I decided that I don't want the fireball cam since it's a high performance street cam. Too high of rpm range and stuff. So I'm gonna quick switch it for my summit 5200 rv cam that I have. More suitable for my truck use.
I've got this weekend off work so this is what I'm doing.
Logistics Pro
Joined: Jun 2003
Posts: 3,921
Likes: 272
FWIW, a lean condition, lean enough to affect steel valves, would've toasted a cast aluminum piston long before the valves.
This issue could've been fixed LONG ago by taking it to a knowledgeable mechanic, instead of guessing and throwing parts at it.
If nothing else, I hope all that have been following this thread have learned a valuable lesson: When in doubt, take it to someone that knows what they're doing. It will save you money and headaches in the long run.
This issue could've been fixed LONG ago by taking it to a knowledgeable mechanic, instead of guessing and throwing parts at it.
If nothing else, I hope all that have been following this thread have learned a valuable lesson: When in doubt, take it to someone that knows what they're doing. It will save you money and headaches in the long run.
Laughing Gas
Joined: Jan 2013
Posts: 1,015
Likes: 4
From: Gulf Coast, MS
Im not going to go back to page 1 but didnt he have the same problem with multiple engines and the only things that were the same were the carb, intake, and truck? No doubt that low of compression is a issue but is that the root of the reason for the original post?
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Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
I don't know what the original problem was, but now that all has been rebuilt and replaced, the valves are now the problem.
Being on a short income, I was trying to save money everywhere I could. Lesson learned, don't try to save money when building an engine. Do EVERYTHING together and all at once!
I can't fathom now that when I swap to this next engine I will still have a problem. If I get this 3rd engine in, and it doesn't run, I'm gonna scrap the truck, because that is the only common factor.
Being on a short income, I was trying to save money everywhere I could. Lesson learned, don't try to save money when building an engine. Do EVERYTHING together and all at once!
I can't fathom now that when I swap to this next engine I will still have a problem. If I get this 3rd engine in, and it doesn't run, I'm gonna scrap the truck, because that is the only common factor.
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Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
Holy cow I'm kinda excited now! Turns out that my summit 5200 rv cam is the exact same specs as Edelbrock Performer-Plus cam! That means that I have a cam that will perfectly match my intake manifold and carburetor!
Plus I will have all 8 cylinders! So I'm gonna guess I'll have a solid 350HP pumping out? You guys think that's about right?
Plus I will have all 8 cylinders! So I'm gonna guess I'll have a solid 350HP pumping out? You guys think that's about right?
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Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
Well at about 3pm today I started working on pulling the engine out. By 6 I had it out and on the ground. Didn't take very long. But I wasn't watching the clock either.
So tomorrow I'll swap the couple of parts I need for to the other engine and I'll put it in.
So tomorrow I'll swap the couple of parts I need for to the other engine and I'll put it in.
Logistics Pro
Joined: May 2008
Posts: 3,670
Likes: 370
From: PHX AZ
Worst cylinders in leakdown test were what 28% leakage?
If there is in fact a burn valve or low compression now it has happened since Christmas time.
How do you know it has a burnt valve? did you pull head off and look?
Sounds more like you leaned it out with the Edel Carb and burned a piston instead. Or a vacuum leak on those two cylinders.
By the way I never saw you return with help or parts you borrowed ~ promised. .
45days or so now . .
Typical
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Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
Fear not randy, I shall return. And will bring back your parts. I'm sorry it has taken this long and now it seems it will take longer. I would have been back much sooner, but After Christmas I started working weekends a lot and the distance makes it even harder. But when I get this other motor in I will need to go for a drive to help with the break in. Perhaps I can head your way.
Yes I don't quite understand why a valve would have gone bad so suddenly, but with the exhaust being sucked back from the tailpipes and low compression, what else could it be besides a valve problem? Ignition and fuel haven't made a difference.
Yes I don't quite understand why a valve would have gone bad so suddenly, but with the exhaust being sucked back from the tailpipes and low compression, what else could it be besides a valve problem? Ignition and fuel haven't made a difference.
Logistics Pro
Joined: May 2008
Posts: 3,670
Likes: 370
From: PHX AZ
Fear not randy, I shall return. And will bring back your parts. I'm sorry it has taken this long and now it seems it will take longer. I would have been back much sooner, but After Christmas I started working weekends a lot and the distance makes it even harder. But when I get this other motor in I will need to go for a drive to help with the break in. Perhaps I can head your way.
Yes I don't quite understand why a valve would have gone bad so suddenly, but with the exhaust being sucked back from the tailpipes and low compression, what else could it be besides a valve problem? Ignition and fuel haven't made a difference.
Yes I don't quite understand why a valve would have gone bad so suddenly, but with the exhaust being sucked back from the tailpipes and low compression, what else could it be besides a valve problem? Ignition and fuel haven't made a difference.
If there was a Burned valve it would have showed up on our compression AND leakdown tests
Remember we even hit valve with hammer during our leakdown tests, checking to see if one was sticking
Absolutely IMPOSSIBLE there was a burned valve at time we messed with it. Piston~and or ring issue yes, burned valve no, at least not to point it mattered
Post Fiend
Joined: Sep 2006
Posts: 14,325
Likes: 14
From: Island Southeast Alaska
This is a strange one for sure. Or we may be missing something. Boss has been there, right?
The rest of us just have to go by what is posted on here.
It sure seems ya could get a better idea of what is wrong before pulling a head.
But I guess we are now down to that. I just don't see any way a valve can go south
in such a short run time as this has been.
Please get pic's and let us know as soon as ya pull her down.
I don't suppose ya know anyone with one of them camera's that
ya can stick in the plug hole and get a look see do Ya.
My bet is a hole in a piston. Either a valve somehow punched it or the lean
mix burnt a hole in it.
The rest of us just have to go by what is posted on here.
It sure seems ya could get a better idea of what is wrong before pulling a head.
But I guess we are now down to that. I just don't see any way a valve can go south
in such a short run time as this has been.
Please get pic's and let us know as soon as ya pull her down.
I don't suppose ya know anyone with one of them camera's that
ya can stick in the plug hole and get a look see do Ya.
My bet is a hole in a piston. Either a valve somehow punched it or the lean
mix burnt a hole in it.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
2X Bobby. SHOULD be the piston before a valve. I actually was thinking about a creaping valve seat. I don't know if hardened were installed. Or what brand of valves made out of what metal. There hasn't been anything normal about poor 351's engine(s) from the beginning.
2X Alex. I suppose it could be a pinhole in the piston but think not. Losing that much compression in less than 2 months?!? In what, probably 200 miles?
2X Alex. I suppose it could be a pinhole in the piston but think not. Losing that much compression in less than 2 months?!? In what, probably 200 miles?
Post Fiend
Joined: Sep 2006
Posts: 14,325
Likes: 14
From: Island Southeast Alaska
I have a good running FE if and when ya get yer fill of the small block.
Just sayin.
But it looks like ya about ready for a change. Just don't do a 350/350.
It's been done to death
Just sayin.
But it looks like ya about ready for a change. Just don't do a 350/350.
It's been done to death