Justin's retroactive build thread
- Strike2
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Re: Justin's retroactive build thread
Damn sorry to hear about the issue, were the heads redone before install, how long had it been sitting before firing it up?
- Justin
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Re: Justin's retroactive build thread
Heads were gone through (cleaned and new valve springs) by Scott at MPG heads and later machined by Western Engine. Engine sat for 12-18 months before being fired.
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- crawlercreations
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Re: Justin's retroactive build thread
I'd bet you lost a head gasket. I'm guessing Kirk might chime in but I sold him an engine many years ago that I knew nothing about besides it being a fresh build before sitting for about a year. He fought head gaskets on that thing for a while. Everything was new, it just ate the head gaskets for some reason.
There is a fine line between "hobby" and "mental illness"
- Justin
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Re: Justin's retroactive build thread
Thanks. I'm hopeful that's all it is. This is the first engine I've built and the first time installing head gaskets, so messing it up seems like a likely explanation. I've drained the coolant, hit the cylinder with compressed air and wd40. Anything else I can do to protect from rust?
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- Jesus_man
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Re: Justin's retroactive build thread
Doesnt seafoam protect from rust and might reach other areas that wd40 wont
1973 Bronco, 351 SEFI, Locked, discs, 35's ZF-5spd and Atlas 4spd. 235:1 Crawl Ratio. It may be ugly, but it's slow.
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- ZOSO
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Re: Justin's retroactive build thread
quick tear it down. I believe I have a set of standard head gaskets in the garage.
I sure hope you don't have the bronco curse.
I sure hope you don't have the bronco curse.
Rob
74 Ranger EFI351w, 4r70w, ARB 5.13 9in, ARB 5.13D44, and a bunch of other goodies. Best of all the family memories.
04 Mustang Cobra, KenneBell 2.2 feeding a lot of boost on E85. Tire shredding machine
New project: 77 Bronco Ranger, body work and more body work.
Very little left of a 72 durango tan explorer sport
74 Ranger EFI351w, 4r70w, ARB 5.13 9in, ARB 5.13D44, and a bunch of other goodies. Best of all the family memories.
04 Mustang Cobra, KenneBell 2.2 feeding a lot of boost on E85. Tire shredding machine
New project: 77 Bronco Ranger, body work and more body work.
Very little left of a 72 durango tan explorer sport
- crawlercreations
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Re: Justin's retroactive build thread
This is why I'll only use cometic head gaskets if they're made for the engine I'm building. No soft material to fail.
There is a fine line between "hobby" and "mental illness"
- Justin
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Re: Justin's retroactive build thread
Got the head taken off. Gasket was intact, but there was something that looked like scuffing on the underside of the #6 cylinder (the one that was barfing coolant). I managed to bang up the gasket during disassembly, so this could have been user error. Checked the flatness block with a straight edge and can see light under it. There appears to be a .002in dip in the block towards the top of the #6 cylinder, so I'm wondering if this is the source of my issues. The mating surface of the heads were milled, but the block wasn't. Pics of the block, gasket and head attached.
Anything else I can do or check before I put this back together and pray?
Anything else I can do or check before I put this back together and pray?
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- landshark
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Re: Justin's retroactive build thread
I think they make thicker head gaskets that you can try.
1976 Bronco "Green, Yellow, whatever", 1969 Bronco "Red", 1972 Bronco Stocker "Kind of Blue/Grayish"
- Justin
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Re: Justin's retroactive build thread
Got the engine back together with all new head gaskets. If I can get off work early enough the plan is to strap on my triple ply underpants and fire it. Really hoping it works this time. If anyone is in the neighborhood and wants to give it a look-see before I run it I'd be appreciative. Otherwise prayers to the diety of your choice are gratefully accepted.
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- Strike2
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Re: Justin's retroactive build thread
I know the feeling the first motor start up was gut wrenching. I will light a candle for you

- Justin
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Re: Justin's retroactive build thread
Proof of life. Finished the transmission mount today.
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- Rox Crusher
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Re: Justin's retroactive build thread
Justin wrote:Proof of life. Finished the transmission mount today.
Great to see you back at it...........how about the engine.............did you fire it up successfully?
1977 Sport, 351w OBDII EFI motor, 4R70W auto, 4:88 gears, ARB lockers, 3.5" suspension, 33" tires.
- Kinder
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Re: Justin's retroactive build thread
Justin wrote:Proof of life. Finished the transmission mount today.
Nice!
Best to Date MPG: 26.6
- Justin
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Re: Justin's retroactive build thread
Thanks! Engine fired, but I'm having issues with some cylinders running very lean. Lean enough that I've had some of the header primaries glowing just running it in the garage. Current best guess is that the heads were shaved too much for stock pushrods. Going to do a compression test and see where things land. Also looking at bad coil, clogged injector, etc. Props to Gary for much excellent tech support! Hoping to get a new battery in today so that I can get that done.
- Justin
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Re: Justin's retroactive build thread
Contracted some very local, very cheap labor and got the crossmember installed. Pretty happy with how it came out.
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- Justin
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Re: Justin's retroactive build thread
This weekend was exhausting (#intentionaldadjoke). As long as everything was apart, I took the time to re-lego the exhaust to behind the tire so that I don't go deaf every time I drive it.
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- Justin
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Re: Justin's retroactive build thread
Also, Gary came over today and made it run right. I'm doing a massive, full-on white guy happy dance. It's not pretty, so I'll share this video instead.
https://www.youtube.com/watch?v=6-7MXuQOyS4
Since I'm not smarter than phpBB you all get a link instead of an embedded video.
https://www.youtube.com/watch?v=6-7MXuQOyS4
Since I'm not smarter than phpBB you all get a link instead of an embedded video.
- phyler
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Re: Justin's retroactive build thread
Woot! Can't wait to see you driving it.
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1975 Ranger Edition that I've had longer than I've been without it.
OG
OG
- Jesus_man
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Re: Justin's retroactive build thread
Ahhh yeah!!!
1973 Bronco, 351 SEFI, Locked, discs, 35's ZF-5spd and Atlas 4spd. 235:1 Crawl Ratio. It may be ugly, but it's slow.
http://www.ucora.org
http://www.ucora.org
- Strike2
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Re: Justin's retroactive build thread
SWEET!! motor sounds great 
- Kinder
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Justin's retroactive build thread
Nice, IΓÇÖm a huge fan of running motors! Ha!
Best to Date MPG: 26.6
- Digger
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Re: Justin's retroactive build thread
Love the video!
Good to see it running!
Good to see it running!
Cummins R2.8 diesel, ZF5, AtlasII, HP44/BB9, ARBs, coiled / linked suspension, 37" KO2s, full cage, bumpers, etc.
Build Thread: http://www.coloradoclassicbroncos.com/viewtopic.php?f=3&t=5420
Average 23.5 mpg, Best tank: 26.3 mpg
Build Thread: http://www.coloradoclassicbroncos.com/viewtopic.php?f=3&t=5420
Average 23.5 mpg, Best tank: 26.3 mpg
- Justin
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Re: Justin's retroactive build thread
Thanks, guys! Here's the real reason my rig has been down so long. Bet the new Bronco won't have this feature. 

- Jesus_man
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Re: Justin's retroactive build thread
Auto pilot! Nice! Getting all tesla on us!
1973 Bronco, 351 SEFI, Locked, discs, 35's ZF-5spd and Atlas 4spd. 235:1 Crawl Ratio. It may be ugly, but it's slow.
http://www.ucora.org
http://www.ucora.org
- Justin
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Re: Justin's retroactive build thread
Didn't have enough speed holes on the Bronco, so I made a bracket.

- Jesus_man
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Re: Justin's retroactive build thread
Looks like a t-case mount? What is the going ratio of mph per hole these days?
1973 Bronco, 351 SEFI, Locked, discs, 35's ZF-5spd and Atlas 4spd. 235:1 Crawl Ratio. It may be ugly, but it's slow.
http://www.ucora.org
http://www.ucora.org
- Justin
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Re: Justin's retroactive build thread
Coil pack mount. Thats the cross bar running between the shock towers. I believe its 3mph per hole, 2mph per sticker.
- Strike2
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Re: Justin's retroactive build thread
Looks at those pretty welds !!
- Justin
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Re: Justin's retroactive build thread
Front end.....Monday?
