Re: If you like destruction -
I feel your pain, I'm in the same boat!!! Fresh BB427, bored, Kieth Black Pistons, Trick Flow alum heads, roller cam, Air Gap intake, etc, etc. Long story short, 515 miles metallic sheen in oil and 9 pounds oil pressure at idle:devil:
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Well, I got the heads off, and I'm actually pretty surprised. The #1 intake snapped off and holed the piston, and slaughtered the cylinder. I can't believe the shortblock held together. I was wrong, and kinda happy about it. Cam, lifters, rockers, springs, retainers, etc are all cherry. Thank goodness, since I had quite a few $ tied up in it. Crank & rods and 7 pistons may be salvageable, but its no big deal either way. The cylinder head on the drivers (odd) side is toast. Some metal from #1 made it to #7 and cracked the head.
I'm open to any ideas or experiences with a valve breaking off like this. Enjoy the pics of carnage. I'll also include the pics from my earlier post that I couldn't get the upload last night. First up the Derale junk... And no, nothing ever hit the fans. They cracked right on the parting line in the plastic where the braces make a twist to meet the hub. Looks like a design issue. |
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When I saw this, I really thought it was the piston that came unhooked and smoked the valve.
Latched on to her, (pucker!!!), and she's out. |
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Now for the destruction!
#1 chamber and cylinder |
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#7 chamber and cylinder. Was full of bits from #1.
Impression on the cylinder head and piston match that big chunk of valve laying in the bore. |
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Shop looks like a bomb went off. I guess it kinda did...
Truck looks pretty sad with no 'motor'vation. Me next to my fresh 'kill' with my weapon of choice - Matco 3/8" drive mini impact gun - the lil dude has been with me for over 16 years and still works like new. If he can't get it, my Ingersoll Rand 'Titanium' 1/2" drive will definitely do it. |
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May have missed it somewhere - perhaps another thread. Are these stock valves? Stock valves are two piece. The head is force welded to the stem. Right about where that gave way. Which is why I have always been a big advocate for quality one piece valves. Especially in a performance build. Relying on stock units with countless cycles on them is asking for trouble. |
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The heads are Edelbrock RPM Marine oval ports - the valves are 'stock' to them. 2.25" one pc stainless intakes, 1.89" one pc Inconel exhausts.
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I see. Do those valve guides have c-clips on top? If so how does it look in the bad cylinder?
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Same failure I had in my story d**t was kind enough to replace one head when the m****y valve did that.
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Oh man. What a mess. Such a small part causing so much carnage. I'm worried your crank/bearings might be damaged from being beat up by the stresses of that event or even the metal bits. Check it for scuffing. I definitely wouldn't trust the connecting rod or pin in that cylinder. But the more you can salvage the better I guess.
As for the fan, yeah, welcome to the world of plastic junk these days. Even GM factory fans have been bitten by this. The Pontiac G8 and Chevy Caprice PPV fans have a tendency to fail like that, eventually shattering the blade and throwing bits into the radiator, poking a hole in it! People talk about it on the forums (and I can't remember if there is a TSB for it). I'll take the old fashioned bulletproof metal factory fans any day for the few HP the electric fans save. I've had too many failures like yours and burned up wiring harnesses, failed relays, etc. Factory clutch fan goes back on my builds. Then again, I don't have any high-rev applications either. |
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Hey Adam, your probably not going to need that serpentine front runner system now are you!!!! LOL It sucks to have all the time and $$$$ invested in a motor and have this happen, I'm still back and forth with my BB or go Ls
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btw you took the engine out incorrectly. do a search on this site and you will see that you have to take all the sheet metal off first :-)
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Now it's just a waiting game until my 532 is finished, probably 8-10 weeks. I'll be back to burning rubber and banging gears this summer. I did call Derale about the fan issue and as expected, they 'have never heard of or seen this before', so I offered to send the guy the pics, of course he declined my offer, but was happy to give me the part number so I could buy a $130 replacement fan... |
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i don't pull the hood and i don't scratch anything :-)
i would if i pulled the sheet metal |
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As soon as the ball really starts rolling on the 532 that I'm having built, I'll post up pics and detailed info. All the short block stuff has been ordered, so I'll start a new thread with the engine/powertrain changes - I'll be using a RAM 'Force' 10.5" dual disc clutch with a modified TKO-600. Also, I don't know if there is any chance the driver's side head from the 468" can be repaired? Does anyone have any experience with an aluminum head getting clobbered like that and having it fixed? |
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The head can be fixed. A good machine shop that knows how to weld can fix it. The heads are Edelbrock? Did you bolt them on right out of the box? They are notorious for having tight guides, valves assembled with no oil on them, and installed spring heights way off. Looking at your picture of the valve stem stuck in the guide, it looks like the stem is blue from heat. Again that is just from the picture. If that is true then that would tell me that the valve was starting to gall from that above reasons. If this is true I think it hung a valve open and smacked a piston. the 2 piece valve snapped off and left you with the mess you have there. Thats what I see from the pictures.
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Yes, they are Edelbrock RPM oval port Marine heads, but not quite bolted on out of the box though. The marine heads don't come with valve springs. They had been ported, put on a flowbench (so I could get the cam spec'd to the heads) reassembled with Crower hardware (spings, retainers, locks) but re used the valves that came with the heads. The work on the heads was done at a shop, so I did not personally check the valves/guides. Once I get some more time, I'll disassemble the heads and try get a better look at the valve and the guide.
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Well that is a good thing then. That means that they were looked at and assembled with care (we hope). You made a good choice going that route.
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