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| Matatk | Give me your opinion on this ebay motor | ||
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Still looking for a block to rebuild, found this on one ebay. Guy says two spark plugs exploded in the cylinder, scratching the walls. Any way to "guess" if the damage is repairable without seeing it?
http://cgi.ebay.com/ebaymotors/GM-Sma ... 22a&_trksid=p4506.c0.m245 Matthew |
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Posted on: 2009/9/12 15:18
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| Matatk | Re: Give me your opinion on this ebay motor | ||
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Oh yeah, here are his Q&As
Q: How deep are groves? If it was bored 30 or 40 over would they come out? Thanks Sep-11-09 A: I can't measure, but they are difficult to feel unless you run your fingernail across them. I think that they would come out if bored out that much, but can't guarantee. Q: Did the cylinder heads experience any damage? Sep-10-09 A: I don't know. Cylinders #3 and #4 had zero compression. I suppose that could be caused by the cylinder wall damage or valve/head damage. They should be professionally checked and may need rebuilt as well. |
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Posted on: 2009/9/12 15:20
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| anesthes | Re: Give me your opinion on this ebay motor | ||
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For $100, it might be worth having the machine shop inspect it.
#3 and #4 are always the ones to go from detonation. It detonated, broke the plug tips off, and mashed the shit out of the cylinders. Heads are junk I'm sure, seats are probably destroyed. Cylinder walls are probably fine, I had this same explosion with similar description (caught a nail) and it just needed to go .010 more over. It WILL have to be bored, but the block is probably ok. Pistons are probably dinged up really good. -- Joe |
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Posted on: 2009/9/12 15:31
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'79 Z28. 412 CID, NP 833 transmission, 3.73 10.5" rear end. |
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| Durango_Boy | Re: Give me your opinion on this ebay motor | ||
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I would be careful. Marine engines tend to be run hard and at very high RPMs for long periods of time. The few I have looked at were egged out and would need a large bore to repair to be rebuilt.
Depending on the price that it actually sells for though it could be worth it for all that machine work. |
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Posted on: 2009/9/12 15:33
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| Matatk | Re: Give me your opinion on this ebay motor | ||
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Thanks guys. I figured if I could get it cheap it's only about an hour away to pick up. I'd be going with .30 over pistons anyway and using the edelbrock heads I bought. I just want the block, crank, and rods as of now. Heads can be scrap metal for all I care. I was just concerned of how much damage a broken plug can do to the cylinder walls. I'll be watching it and see how cheap it goes.
Matthew |
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Posted on: 2009/9/12 15:36
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| Aboatguy | Re: Give me your opinion on this ebay motor | ||
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You may be good to go a few years ago I broke a valve. and even though the piston was trashed, forged steel rod turned into the letter S and cylinder head turned into scrap aluminum, the cylinder cleaned up without a rebore (I was willing/expecting the bill for a rebore but however, the machinist was able to clean it up with a hone and did not rebore it and reinstalled the same PN piston as the shredded one.
So it could be A OTAY or a boat anchor. [IMG]http://i14.photobucket.com/albums/a342/aboatguy/DSC01272.jpg[/IMG] |
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Posted on: 2009/9/12 17:13
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| bogus | Re: Give me your opinion on this ebay motor | ||
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Grand Imperial Pooh-Bah
 
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Don't the Vortec engines have a different head bolt pattern?
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Posted on: 2009/9/12 17:13
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| Aboatguy | Re: Give me your opinion on this ebay motor | ||
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I believe the heads are interchangeable its the intake manifold thats different. The heads are supposed to be good, basically LT1 heads converted to Gen 1 cooling. |
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Posted on: 2009/9/12 17:22
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| Durango_Boy | Re: Give me your opinion on this ebay motor | ||
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The heads are supposed to be good, basically LT1 heads converted to Gen 1 cooling. Vortec heads are very good...well they are a good platform anyway, but I was under the impression that LT1 heads were a similar design to the TPI and TBI swirl port heads and the Vortec head was a design unique to itself. I do know the Vortec heads flow better then LT1 heads based on a few articles I read over the years when I was learning everything I could on Vortec heads. |
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Posted on: 2009/9/12 19:06
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| Touringmike | Re: Give me your opinion on this ebay motor | ||
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I may be wrong here (most likely), but isn't the Vortec a 60 degree block, compared to the 45 degree 350 SB? That would lead me to believe a smaller cross-width head pattern. |
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Posted on: 2009/9/12 21:07
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| anesthes | Re: Give me your opinion on this ebay motor | ||
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Master Guru
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Quote:
No, everyone and their grandmother on the fbody forums put vortec heads on their stock L98s, however the INTAKE side bolt pattern is different, and the ports are taller and narrow so you need a Vortec TPI baseplate, Vortec HSR, or Vortec CARB intake. The vortec heads, with small chamber, bump compression up. With a cam swap it will turn a slow heavy fbody into a low 13 second car. Most Corvette guys don't like them however, because they are Iron so they assume they are off the bat not as good as their L98 '113' casting heads, however if you low at flowbench and velocity comparisons they spank the 113 heads all day long. Google "L31" heads for more info. -- Joe |
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Posted on: 2009/9/12 21:55
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| anesthes | Re: Give me your opinion on this ebay motor | ||
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Quote:
No. -- Joe |
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Posted on: 2009/9/12 21:56
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| rklessdriver | Re: Give me your opinion on this ebay motor | ||
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I may be wrong here (most likely), but isn't the Vortec a 60 degree block, compared to the 45 degree 350 SB? Your wrong. :tongue:  There is no difference in 5.7L Vortec and a L98 (or any post 86 SBC) short block wise. The difference is the cyl heads. The Vortec cyl head has slightly raised intake runners, a high swirl combustion chamber and an odd (SIMILAR to LTX) intake flange bolt pattern. Back in the day we would drill and tap the intake pattern to the std SBC bolt pattern so we could use the Vortec heads on our limited class oval track engines.Matatk - Ask the guy to remove the head gasket and take a pic of the deck surface.... That engine detonated it self to death. Looks like they ran it until it broke the rings on those 2 pistons and it then blew the head gasket between those 2 cyls. I also see water intrusion from the blown head gasket, which may equal bent rod(s). The cyl walls will probally clean up at .030 but if the deck surface is burned/scored between the 2 cyls (and it is very common) there is no fixing the block. I think he is trying to hide the damaged/non repairable deck surface by not removing the head gasket for the pics.... Will |
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Posted on: 2009/9/12 22:09
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1984 Corvette. 434 SBC with a Powerglide. Best pass - 8.48@160MPH 1.23 60ft on MT 275/60R15 Radials. 1972 Corvette. LS5 454 BBC with M20 4 speed. Best Pass - Doing good to just pass a gas station. |
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| bogus | Re: Give me your opinion on this ebay motor | ||
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Grand Imperial Pooh-Bah
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That clears that up... About an hour after I posted that question, I realized that I had the wrong bit - meaning head vs intake.
Thanks! |
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Posted on: 2009/9/13 0:58
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| vetteoz | Re: Give me your opinion on this ebay motor | ||
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Senior Guru
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Quote:
Vortec head with std intake [IMG]http://i171.photobucket.com/albums/u309/vetteoz/vortec1.jpg[/IMG] |
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Posted on: 2009/9/13 0:59
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| bogus | Re: Give me your opinion on this ebay motor | ||
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Grand Imperial Pooh-Bah
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raised port is a good thing. It's where the LT4 got some of its power from.
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Posted on: 2009/9/13 3:27
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| Durango_Boy | Re: Give me your opinion on this ebay motor | ||
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Elite Guru
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If that auction goes sky high, let me know. I actually have a '96 Vortec block in need of a good bore, a virgin crank, and rods. I'd give them to you at a low price and I'd make you come pick them up so I could take you out for a cold beer of five. |
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Posted on: 2009/9/13 12:41
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| Matatk | Re: Give me your opinion on this ebay motor | ||
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Thanks for the offer, DB. Everything is up in the air right now. I think my time is near as far as the head gasket in the vette right now (90,000 miles). I wanted to have an extra block to just build and drop in to make it easy.
I did ask the ebay guy to take some more photos underneath the head gasket. I don't know if he will or not. Another guy on craigslist has an L98 block for sale with iron heads from a 1991 formula that has 120,000 miles on it. Only wants $200, it's a little more than an hour away. Not sure what to do. Matthew |
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Posted on: 2009/9/13 13:35
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| Matatk | Re: Give me your opinion on this ebay motor | ||
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Well, I asked the guy to photograph under the burnt portion of the head gasket and he replied:
"Sorry, I don't think I'm going to have time to remove the heads (they were re-assembled) and clean off the head gasket before the auction ends. Please bid based on what you see since I just want it out of my garage!" Maybe I'll bid $.01. Lol. Matthew |
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Posted on: 2009/9/15 4:45
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| Durango_Boy | Re: Give me your opinion on this ebay motor | ||
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Elite Guru
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Stay away.
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Posted on: 2009/9/15 9:24
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