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By randyh - 6 Years Ago
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I know the 312 ECZ-6015C blocks are very difficult to find in good, uncracked, usable condition but thought I would ask if anyone has one for sale. I finished restoration of my father's supercharged Custom last summer and used the only good 312 block that I could find, a B9AE block. I had five ECZ 312 blocks but all were cracked at the main bearings. Correctness of the car is very important to me so, if anyone has or knows of a block for sale that has passed a magnaflux test please let me know by a PM. Thanks, Randy
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By Butch Lawson - 6 Years Ago
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Where are you located?
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By randyh - 6 Years Ago
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Pittsburgh, PA
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By hjh - 6 Years Ago
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Randy If you don`t have any luck in finding one I may be able to help you out , call me Harry Hutten 513-868-3311 S/W Ohio Cinci.
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By PF Arcand - 6 Years Ago
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This crack issue brings up a question.. For say street use only & assuming the block isn't badly damaged, is there any reasonable way to repair one?
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By Hoosier Hurricane - 6 Years Ago
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For street use, and also for my supercharged '57 drag car, I have drilled and tapped the hole deeper and used a longer bolt. Be careful that the bolt isn't too long and blocks the side oil passage. And don't torque to 140 ft. lbs. like the factory did in '56. Use 90-100 pounds.
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By PF Arcand - 6 Years Ago
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John: Wow! Just drilled & threaded for a longer main cap bolt. No attempt to weld the block or plate the crack area ?. And used in a race car. It would seem those blocks are just as tough as I've suspected..
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By 1960fordf350 - 6 Years Ago
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I have a 312 I just bought last week. Can you magnaflux-or die test the block while its still assembled? I hate to knock it apart if the bottom end is actually good. It's been bored to ,0425 by a rebuilder. You can still see the crosshatch marks in the bores.
Interesting about tapping the holes deeper, how deep can you go?
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By PF Arcand - 6 Years Ago
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Unfortunately you didn't contact this site before you bought the engine.. All supposed 312 blocks should be inspected one way or the other before purchase, especially 1956 engines, partly because of the issue of cracks & also because they are difficult to check out when assembled as to what they actually are. As some one once commented, there are more 312 engines (particularly 1956's) advertised for sale then were originally built!.. Not quite true, but often what is advertised as a 312 is actually a 292 or even a 272 engine.! Casting letters/numbers on Y-Blocks don't necessarily differentiate between the displacements..You need to see the crankshaft & Con rods for the ECZ markings to confirm an original 312 engine.. Good luck with your buy..
P.S.- maybe I'm missing something, but and I'm not understanding the overbore numbers you posted?..
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By randyh - 6 Years Ago
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Ted, If I understand your post, you have successfully used blocks with cracked main webs by tapping the bolt holes deeper? Two engine builders in my area, granted neither with much y-block experience, strongly recommended not to use these blocks even with studs installed in deeper holes. If some of the cracked 312 blocks can be used that would be good news.
Randy
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By 1960fordf350 - 6 Years Ago
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Paul, its funny that an ad for an engine has turned into a discussion! LOL I actually thought I was buying a 292. I was planning to have it bored. I never looked at any numbers on it, and the bell and flywheel were still on it. So I didn't see 312 till I took the flywheel off. The .0425 is the number on the rebuilders tag, and is also stamped in the top of the pistons.
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By Ted - 6 Years Ago
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1960fordf350 (1/27/2018)
.....The .0425 is the number on the rebuilders tag, and is also stamped in the top of the pistons.
The Ford rebuilders used 0.0425” oversize quite a bit back in the day. Hard to say why unless too many blocks simply didn’t clean up at 0.040” but did at 0.0425”. I’ve pulled down a number of ‘Fred Jones’ rebuilt 292’s that had 0.0425” oversize pistons in them.
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By Ted - 6 Years Ago
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randyh (1/27/2018)
Ted, If I understand your post, you have successfully used blocks with cracked main webs by tapping the bolt holes deeper? Two engine builders in my area, granted neither with much y-block experience, strongly recommended not to use these blocks even with studs installed in deeper holes. If some of the cracked 312 blocks can be used that would be good news.
Randy
This is surely addressed to the other ‘Ted’ on the site as I junk out blocks with problems less than cracked main webs. If the blocks are cracked in the main webbing area, they are simply put into the scrap pile. On my end I simply cannot warranty the fix. Many of those blocks with cracked main webs are also cracked into the oil galley which makes them doubly hard to repair. I have seen attempts to repair blocks with cracked main webbing and none made it far down the road.
John’s suggestion of tapping the main holes deeper and using a longer bolt does allow the stress on the main bolt threads to be spread out deeper within the block instead of right at the journal bore. This is performed to a block that’s not cracked to prevent a future crack. As John mentions, the main bolt torque on the 312’s is important. To date, all the 312’s I’ve seen with cracked main webbing have been previously rebuilt which points to improper or excessive main bolt torque. I’ve yet to see a factory assembled 312 with a cracked main web.
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By 1960fordf350 - 6 Years Ago
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Can those rings still be bought? I guess I'll have to tear down this block to find out if its cracked.
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By randyh - 6 Years Ago
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Sorry Ted, I was responding to John’s post but mistakely put your name in.
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By Hoosier Hurricane - 6 Years Ago
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Randy, yes I have successfully used blocks repaired this way, if there is only a crack from the bolt hole to the edge of the web. That bolt only carries 1/10 th of the total crankshaft load. Ted and other professional engine builders will not do this because they have to guarantee their work, so any questionable part won't be used. I have done this only on my own engines. I usually drill all the main holes deeper, cracked or not. Puts the load a little deeper into the block. I use grade 8 bolts.
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By rwatts - 6 Years Ago
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I have a complete engine and trans sitting in a 1956 customeline that runs. not going to magflux to sell. If interested email
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By Ted - 6 Years Ago
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rwatts (1/28/2018)
I have a complete engine and trans sitting in a 1956 customeline that runs. not going to magflux to sell. If interested email
You’ll have much better luck in selling parts in a post specific to what you’re selling. Posting to someone else’s ad will keep potential buyers from seeing it. Be sure to make it a new post and not add it to a post already in progress. Also include specific details along with price and location and/or general area.
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By slumlord444 - 6 Years Ago
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On the .0425 rings. I had the same problem a couple of years back when I rebuilt mine. A friend in the Ford parts business got me the pistons from Ford back in 1968. I finaly called Grant Piston rings directly and told their guy in the plant what i needed. He put together a set from a couple of different applications and shipped them to me. Working fine. Cost was a little higher than an off the shelf set but not much.
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By 314 - 6 Years Ago
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i had a set of those years ago.i ended up using .040 rings.cant remember the gap but i dont think it was to bad.
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