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By dropped 57 - 14 Years Ago
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I just finished tearing down my motor (it was the topic of a thread in classifieds "292 in oregon"or some such B.S." a few months ago. Anyway, there were a few bets on what it would really turn out to be, 239, 272 etc. So it's a '55 272, with 5257-113 heads and a weird two barrel tea pot/governed carb, with a 4 speed of some sort...Anyway, to the point. Upon removal, all of the mains have wear only near the clamping point where the two halfs meet. It seems odd to me, how about you?...
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By Ted - 14 Years Ago
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Do all five of the main bearing sets show this particular wear pattern or is it just one or two? You did say 'all' but just verifying. Is the wear pattern evident on just one side of the bearing or on both sides? Got any pictures?
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By Hoosier Hurricane - 14 Years Ago
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My first thought is that the main caps are installed backwards. The bearing lock tangs should both be on the same side of the bearing bore.
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By dropped 57 - 14 Years Ago
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there we are! it is very similar on both sides of the caps 
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By Richard Head - 14 Years Ago
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dropped 57 (7/25/2011)
Upon removal, all of the mains have wear only near the clamping point where the two halfs meet. It seems odd to me, how about you?...
Looks to me like you have wear everywhere BUT where the two halfs meet? Which looks pretty normal to me. It's worn all the way threw the bearing material down to the copper.  Got your money out of those Bad Dogs.
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By oldcarmark - 14 Years Ago
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Looks normal to me.Same as mine were when I disassembled.Interestingly my crank was STILL within specs and needed a light polish only and new standard size bearings to reuse as is.My motor was just a stock rebuild.
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By dropped 57 - 14 Years Ago
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I've been found out! this is my 1st rebuild... Here is my plan, I'm putting together a new drivetrain for my one and only, a '57 f100 with a 223/fordomatic. The block is being mag'd as I write... ]Question: Is a sonic test essential prior to boring a 272 block to 292 dimensions?
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By oldcarmark - 14 Years Ago
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Dont hesitate to ask questions.No question is dumb if you dont know the answer.Lots of experience available.Just ask!
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By dropped 57 - 14 Years Ago
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Thanks, I just don't want to waste anybodys time. So, I am planning on the 292 bore, if the block is sound. Then, have the 113 heads that came on it mag'd, next will be the crankshaft tolerences. Then, if everything is cool I think a "hot rod y in a box" is about the best way to go, for what I hope to achieve, and my wallet! . This is where I'm starting...I've got a 3" axle from sid's under it, and I still need to flip the rear end and put the monoleaf springs on the 4 corners
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By lowrider - 14 Years Ago
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You can always get good information here. Ask away. Like everyone mentioned, it looks like normal wear on the mains. The way my old man explained to me the force of the engine running would put the wear on the bottom half of the main bearings. Uppers would always look like your in most cases. Nice truck!
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By dropped 57 - 14 Years Ago
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Thanks,The rotational forces up, and down kinda' fits what my logical sense was telling me. What about the sonic testing issue prior to going ahead with boring the 272 to to 292 dimentions?
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By yblockpinto312 - 14 Years Ago
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Sonic testing is always wise when boring that far. It`s better now than find out you should have. Better to know than assume. We all Know what happens when we assume.
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By dropped 57 - 14 Years Ago
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So, the shop that's magnifluxing my block doesn't have sonic capability, I'm in portland oregon...Any suggestions?
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By Ted - 14 Years Ago
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First ask the guys at the shop that has your block if they have someone they can recommend for the sonic testing. If they can’t help, then check out some of the other shops in the area and especially any that do racing or high performance work. One of those should have sonic testing capability. Although ‘most’ 272’s will bore out safely to the 292 bore size, there are just enough of those blocks out there with core shift issues that makes sonic testing a prerequisite. You have to remember that you're wanting to bore the block 0.125” over the stock bore size and that’s a push in the best of circumstances. As a for instance, I sonic tested an EDB 292 block yesterday that I simply wanted to bore 0.080” over but that particular block ends up only being a candidate for being bored 0.050” over. Core shift in that particular block was quite severe. Without sonic testing, that would not have been known.
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By dropped 57 - 14 Years Ago
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Thanks Ted, The shop that has my block says that they have lots of experience with the Y, but they don't have sonic equipment nor could they recommend anyone close that did...I'm sure that there is someone in the Portland, Or. area... AND I WILL FIND 'EM. I am going to build a Y block...The only other choices for me are the stock 223 (I got beat on an ebay bid for a fenton split exhaust for the 223, the winner paid nearly $2000!) or a flathead, would a flathead be practical in my truck as my one & only daily??? I dunno.  
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By 46yblock - 14 Years Ago
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A flathead in your nice truck would be underpowered, and give poor gas mileage. If we have a sonic testing facility down here in little Grants Pass, OR, Portland definitely does also. In the small chance that there isnt someone, try Salem.
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By dropped 57 - 14 Years Ago
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I know the flathead is'nt the way to go for my truck, but it would look sooo nice way down in that big 'ol engine bay fully dressed...Kind'a like a painted up whore in a one room schoolhouse, um no, make that a whore in the church confessional!. Or some such poop. Thanks for the suggestions re. sonic testing, I'm sure there's one around here somewhere. Maybe out by the race track or... done wasting space for awhile...
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