EQ head problems
#2677220
07/13/19 11:27 PM
07/13/19 11:27 PM
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Joined: Jan 2008
Posts: 2,240 ILLINOIS
volaredon
OP
top fuel
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OP
top fuel
Joined: Jan 2008
Posts: 2,240
ILLINOIS
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This is on a 360 magnum in a Durango. Stock size engine,. stock rebuild. 30 over, only deviation. That and a set of out of the box assembled EQ heads. Had a couple of hours on the rebuild and less than 10 miles. Tried to drive, wouldn't even hit 60 mph, acted like it was running out of fuel. Died once, fired right up. Died again a mile away in the middle of a left turn, wouldn't restart. Brand New fuel pump, new cat at time of the rebuild. When it wouldn't restart I got out and saw the exhaust was glowing cherry red. Melted down the brand new cat. Computer to find out #4 exhaust pushrod was bent, and the valve is bent, it hit the Piston. These heads are at the machine shop as we speak, they tell me that all of the guides are too tight.basically gonna need a whole valve job to correct. Another$200 on too of the $700 I paid for the heads in the 1st damn place. Any one else have issues with EQ heads? I did this overhaul in October and November 2016, truck has been sitting ever since in the garage. I am just now getting back into it. Anyone else ever heard of this before with these heads? Injectors on time back then/ once I did get it to run once I got it close to home the injectors were showing 17 milli seconds on time instead of the 3.some that it should have been. The short block is junk, needs another rebuild. I have another to put in, but I wanted to get the 2nd replacement engine in but wanted to reuse the EQ heads on this block. Is the sticky valves the extent of the problems or does the computer system come into play? Would sticky valves cause the injectors to stay open longer than expected?
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Re: EQ head problems
[Re: rbkt65]
#2677278
07/14/19 09:57 AM
07/14/19 09:57 AM
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Joined: Jan 2003
Posts: 14,499 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,499
So. Burlington, Vt.
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Pretty common with those heads actually.
That’s a head where it’s really worth the extra expense up front to have them set up by a compitent machine shop.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: EQ head problems
[Re: rbkt65]
#2677310
07/14/19 11:59 AM
07/14/19 11:59 AM
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Joined: May 2019
Posts: 6,262 nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,262
nowhere
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best friend had same thing happen twice. he bought heads bare, did own assembly with new valves. saved 250.00 dollars. bent some valves and pushrods. do over. happened again. he called the magnum guy he got bare heads from and he told him that the guides needed opened up. he did what he was told and now has 10k on eng. runs like a dream. i think it was guy on west coast that had to quit because of health problems. he spent another 800 to save 250.00. sorry for your loss. That would be your friend's fault there, both times no less. You always check clearances when you built something from parts sourced from multiple places. Heck, I check my machine shops work when I build my engines. Yeah I trust them, but I verify.
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Re: EQ head problems
[Re: Sniper]
#2677316
07/14/19 12:51 PM
07/14/19 12:51 PM
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Joined: Jan 2003
Posts: 14,499 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,499
So. Burlington, Vt.
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I had someone send me a used set of those heads last year. About 2000 miles on them. No sticking valves, but it appeared someone had made an attempt at addressing that potential problem. This set of heads had the valve to guide clearance set up pretty loose...... and it looked the the method of choice was to run a dull wobbly reamer through the guides. After the heads had been thoroughly cleaned, you could look through the guides and see the undulations down the length of the guide, and the hit or miss shiny spots where the valve stems were actually making contact with the guide bore. The measured clearance was a variable and notchy feeling .003-.0035+.
I installed bronze liners in them.
If the factory bored finish was fairly smooth and straight, you should be able to hone the guides to the correct clearance and not have any issues running them like that. Since there have been multiple reports of sticking valves in these heads, I’d avoid running the clearance anywhere near the min end of the clearance spec.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: EQ head problems
[Re: 65rbdodge]
#2677377
07/14/19 06:24 PM
07/14/19 06:24 PM
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Joined: May 2015
Posts: 1,134 Lost in Time
Iowan
super stock
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super stock
Joined: May 2015
Posts: 1,134
Lost in Time
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It's all over the internet about new aluminum heads, go look on utube, you should not install them out of the box. Bad valves, seats and guides. It doesn't matter what brand your working with.
Have a great day Iowan
"obsolete is neat"
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Re: EQ head problems
[Re: Neil]
#2677705
07/15/19 04:51 PM
07/15/19 04:51 PM
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Joined: Jan 2008
Posts: 2,240 ILLINOIS
volaredon
OP
top fuel
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OP
top fuel
Joined: Jan 2008
Posts: 2,240
ILLINOIS
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It's not unheard of to end up with tight guides on rebuilt heads. Some machinists are too _____ lazy and never check this stuff. Same with cleaning oil passages etc. They'll charge you for it, but did they really do it?
My brother ported a set of Pro Comp(?) heads for a small block Mopar a few months back and several of the guides were so tight there was no way the oil would ever be able to get in there and do it's job. People get angry when they find out their new parts need work, but it is what it is. But that's just it. These weren't new as in "fresh rebuilt"/ these were new as in BRAND new, never having been previously bolted to an engine-- ever--- when I took them out of the box, and bolted them on. On the bronze guides I have heard that that brings up it's own potential set of issues. But yeah I've had heads redone that way before too.
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Re: EQ head problems
[Re: Neil]
#2677790
07/15/19 09:10 PM
07/15/19 09:10 PM
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Joined: Jan 2003
Posts: 14,499 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,499
So. Burlington, Vt.
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There are “known good” parts and there are “new” parts....... and they aren’t always the same thing.
I never just assume new will be good.
With something like an assembled head, there are a lot of different pieces that all have to fit together in a certain way to not have problems with it. It’s no different than buying a computer or a washing machine. Just go on line and read the reviews for just about any item you can think of and you’ll find a pretty large number of defective units.
Auto parts are no different.
One of the differences between a head and a microwave is ...... you can bring the head to a shop and have it checked out before spending a bunch of time and $$$ on other items that are needed to complete the job.......so that you don’t end up with a defective unit leaving you on the side of the road........100 miles from nowhere .......at 3am. When the microwave dies, you just bring it back to Walmart....... no biggie.
When you have a new head gone through by a qualified shop, and get it back with a clean bill of health..... then you have “known good”, and “new”.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: EQ head problems
[Re: slantzilla]
#2677856
07/16/19 08:36 AM
07/16/19 08:36 AM
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Joined: Jan 2008
Posts: 2,240 ILLINOIS
volaredon
OP
top fuel
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OP
top fuel
Joined: Jan 2008
Posts: 2,240
ILLINOIS
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My shop is 10 miles south of there in Milford. You still got that? I haven't been on the /6 site in a while. Been wanting to get down there and see your buddy Pat. Was in PF yesterday. Mother in law's yard needed mowed
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Re: EQ head problems
[Re: volaredon]
#2678105
07/16/19 10:25 PM
07/16/19 10:25 PM
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Joined: Jan 2008
Posts: 2,240 ILLINOIS
volaredon
OP
top fuel
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OP
top fuel
Joined: Jan 2008
Posts: 2,240
ILLINOIS
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ok// back to the drawing board. need someone who knows more about the fuel injection setup, to jump in here and advise me on the pig rich running/ and whether the sticky valves might somehow draw that response from the computer...… I had the computer rebuilt shortly before the overhaul, chasing a #6 misfire before the bottom end of the original engine started showing its age.... and I took the fuel rail off, took it in, had the injectors overhauled, flushed and screens replaced also about 1000 miles before the original engine came out, and they were given a clean bill of health, by the fuel injection place. could they have a problem that the injection place missed or maybe caused for that part of the problem? engine was rebuilt 100% stock, except for these heads and a 30-over bore job. original injectors. No tune. no cam. no 1.7 rocker arms. some of which I want to add, once I get it running again as it should in stock form. I have never really liked computer control.
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Re: EQ head problems
[Re: volaredon]
#2678264
07/17/19 11:44 AM
07/17/19 11:44 AM
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Joined: Jan 2003
Posts: 14,499 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,499
So. Burlington, Vt.
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I wonder how many people who would be willing to help with an auto computer problem are going to respond to a thread entitled “EQ head problems”. If only there were a way to have the title and thread pertain to that line of questions.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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