I need an old guy....
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Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
Seems like you have checked everything. There are things that only show up after things get a little warm. Did you Magnaflux block and heads? Sometimes a crack in cylinder wall, head, or intake will only show up after a little heat. Not by just spinning things over and checking compression. And could be valve seat, or valve guide might be a little off, or valve slightly bent. I only say this because it seems you have done a pretty through check of things.
Laughing Gas
Joined: Jan 2013
Posts: 1,015
Likes: 4
From: Gulf Coast, MS
I have been reading your thread just cause other peoples problems may help out in the future and like the previous poster said it seems like you have been over everything. As you have stated you have been through 2 engines in this truck basically but other than the truck there is something that has been fhe same this whole time, something that has been re used and looked over....or you have gremlins. I hope you get it figured out
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Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
Even if that doesn't make a difference, I'll be a step closer to my desired finish line for the truck.
Logistics Pro
Joined: May 2008
Posts: 3,670
Likes: 370
From: PHX AZ
We did more than what I typed.
We also had piston on TDC comp stroke with valve covers off and tapped on rockers with Rubber hammer while doing a leakdown test.
All indications to me were any leakage was getting past the rings and not a valve issue.
Did not pull plugs again after we ran it, Its not really a intermittent issue but does fade some around 2700 rpm.
Vacuum leak on intake seems the culprit . . . . Or the small % the dist. Intake or gasket mismatch is another guess.
I watched rockers and valve action on passenger side no wiped cam . .
We also had piston on TDC comp stroke with valve covers off and tapped on rockers with Rubber hammer while doing a leakdown test.
All indications to me were any leakage was getting past the rings and not a valve issue.
Did not pull plugs again after we ran it, Its not really a intermittent issue but does fade some around 2700 rpm.
Vacuum leak on intake seems the culprit . . . . Or the small % the dist. Intake or gasket mismatch is another guess.
I watched rockers and valve action on passenger side no wiped cam . .
Lead Driver
Joined: Aug 2003
Posts: 7,592
Likes: 10
From: **** hole San Jose ca.
If those heads have been milled a lot or shaved a number of times you may be fighting some what of to much manifold mating surface angle. Like what happens too the FE's motors when head are cut over 0.20ths+ Then intake manifold needs to be shaved some to match your angle for gaskets to make a good seal...orich
Senior User
Joined: Jul 2006
Posts: 409
Likes: 1
Grounding gremlins........ You must be frustrated to no end. With everything you have done and everything you have replaced I can't imagine your problem is fuel or ignition related at this point. The only thing that you haven't replaced is the truck itself so maybe this is where we should look. Your ground to the body is in the correct location and I am sure that you took steps to make sure that it was a good clean connection. However 40 something years of rust and corrosion will reduce the ability for the current to go from the cab back to the chassis to complete the circuit. This has sent me, more then once I might add, on a wild goose chase dumping large amounts of time and money before I figured this was the problem. Try running a grounding strap from the firewall to the frame to eliminate this as being the cause.
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New User
Joined: Dec 2013
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WOW I feel for ya man. Really reaching here but one thing has not been discussed. Cam bearing in block turned or moved (or moving) affecting oil flow to top or cam movement......never heard of this happening, but hey yours is a strange case too.
Lifter or lifters pumping up or not pumping up (Piece of foreign material floating in lifter).
Might need to install surveillance camera and catch gremlin.
Lifter or lifters pumping up or not pumping up (Piece of foreign material floating in lifter).
Might need to install surveillance camera and catch gremlin.
New User
Joined: Dec 2013
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Ok, but I can't figure out how that will help. Best of my knowledge his problems are isolated to a couple of cylinders. Intake would have to be damaged to cause a problem, leaking,cracked, or miss aligned port. I presume intake is a duel plane,and not a single plane Cant see how carb would effect only couple cylinders
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
Ok, but I can't figure out how that will help. Best of my knowledge his problems are isolated to a couple of cylinders. Intake would have to be damaged to cause a problem, leaking,cracked, or miss aligned port. I presume intake is a duel plane,and not a single plane Cant see how carb would effect only couple cylinders
New User
Joined: Dec 2013
Posts: 19
Likes: 0
This poor young man has had multiple threads going back darn near a year with this engine not running right. Only the intake and the truck it's self have not been changed. It's got to be cracked/warped intake or port match gasket problem. A few things in the past headed me towards the carb (s) not running right or jeted wrong. I'd like to see him put his hyper cam back in it after the intake and carb solves the issue (s).
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
I will tonight also at 10:00. Both you and I at the same time together, as it says in the Bible, when 2 or more believers pray together......................