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Old 05-31-2007, 06:38 PM   #1
Jeremy@Cobb
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News NEW Subaru EJ257 "703" engine casting.

Out with the old, in with the new!

Here is a comparrision of the New EJ257 Subaru cylinder block castings vs. the previous 702 EJ257 cylinder block casting.
The casting quality difference is night and day!
(703) Casting is the new latest and greatest cylinder block casting.
(700- 702) Castings were used for previous model years.

All internals appear to remain the same.






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Last edited by Jeremy@Cobb; 05-31-2007 at 07:34 PM.
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Old 05-31-2007, 07:03 PM   #2
kaos200
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whats the difference?
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Old 05-31-2007, 07:03 PM   #3
kaos200
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Quote:
Originally Posted by Jeremy@Cobb View Post
Out with the old, in with the new!

Here is a comparrision of the New EJ257 Subaru cylinder block castings vs. the previous 702 EJ257 cylinder block casting.
The casting differences are night and day!
(703) Casting is the new latest and greatest cylinder block casting.
(700- 702) Castings were used for previous model years.

All internals appear to remain the same.







is it just me or do those two look like the same block?
the coloring on the pan seal matches, but there are a couple scratches on the "older" block.
AHHH AM I GOING BLIND AND CANT TELL THE DIFF!?!?
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Old 05-31-2007, 07:07 PM   #4
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Casting quality, very evident between the 2nd and 3rd picture.

- J.
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Old 05-31-2007, 07:17 PM   #5
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Any change in the thickness of the cylinder liners?
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Old 05-31-2007, 07:28 PM   #6
rlavalle
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When Jeremy said 'surface finish', I think he meant the surface of the various portions inside the block, not the pan to block mounting surface. Look at the areas between the pistons that connect the 2 halves together... Much smoother and nicer on the new block vs. the many imperfections in the old one.

Russ
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Old 05-31-2007, 07:37 PM   #7
MJU1983
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Looks nicer, I remember seeing some of the old ones and just thinking to myself "wow."
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Old 05-31-2007, 07:53 PM   #8
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cliff's notes...
the 703 casing is prettier





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Old 05-31-2007, 08:13 PM   #9
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Cleaner casting means less chance for hotspots?(I am take a big guess here)
Or are their other technical advantages that are naked to the human eye?
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Old 05-31-2007, 09:29 PM   #10
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You have to be kidding
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Old 05-31-2007, 10:03 PM   #11
rlavalle
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Just seems to me that a cleaner casting means it's going through a higher quality, more precise process.
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Old 05-31-2007, 11:48 PM   #12
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Soo.... the short block (703) is the same price right??
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Old 06-01-2007, 12:41 AM   #13
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I would definitely say that casting is cleaner than the 702, which I just received:

top, you can see all that casting flash everywhere in comparison to the new 703 casting:


oil pan area, again rougher than the 703:




As long as they are both functionally identical, I'm happy.

-JT
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Old 06-01-2007, 01:24 AM   #14
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it would be nice to know if there are any other differences besides the visual smoothness.

Im impressed by the new casting.
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Old 06-01-2007, 01:29 AM   #15
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Basically the new casting makes the older one look like a Made in China version.
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Old 06-01-2007, 01:33 AM   #16
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Quote:
Originally Posted by kaos200 View Post
whats the difference?
1-2or 3
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Old 06-01-2007, 01:34 AM   #17
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They just got a new die. It's a lot nicer though. The other one looks nasty compared to the new one.. I work with die cast, to the trained eye you can see a huge differance.
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Old 06-01-2007, 02:34 AM   #18
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Meh, if it does the job the same, it's fine by me. Although I WILL agree it looks smoother, thats not SUCH a big deal. Ah well.
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Old 06-01-2007, 02:47 AM   #19
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SO is this going to make me faster? I was hoping for better pistons or something good
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Old 06-01-2007, 03:22 AM   #20
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isn't this going to be covered up by intake/exhaust manifolds and crossover pipes anyways? it's not like somebody is going to go poking around to see if you have a rough surface on your block. so, i agree that it isn't a big deal as long as it doesn't affect reliability, etc...right? unless of course, they used a slightly different alloy or something for the 703 blocks.
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Old 06-01-2007, 03:32 AM   #21
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I can't believe they sold me that crappy BLOCK!!

The new one looks great...Very Smooth!!!!
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Old 06-01-2007, 03:35 AM   #22
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Friggin 702 crap!!!

I want a smooth 703~!!!
The bumpy metal hurts my hands...lol

Stupid 702!!
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Old 06-01-2007, 01:44 PM   #23
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don't forget that casting flash creates stress risers which induce cracking. Not a whole lot of block halves cracking, but this smoother finish technically creates a stronger block half.

edit: thanks for the info jeremy. good find.

Last edited by wrxhard; 06-01-2007 at 01:57 PM.
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Old 06-01-2007, 02:14 PM   #24
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Jeremy,

Have you built any blocks with this new casting yet? The reason I ask is I ordered a tuner stge.2 block about a month ago and am wondering if it is 702 or 703. Thanks.

edit -It is at the shop and I can't look right now to see.
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Old 06-02-2007, 01:43 PM   #25
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doh... I bet there are now alot of pissed off people who bought older blocks
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