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Old 01-30-2019, 03:18 PM   #1
pcampbell
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Default Newb question on built vs IAG

Need some newb advise on what machining costs on a running EJ 25 motor? Trying to understand cost differences between building a SB with to be decided $400 rods and $600 pistons versus a $3500 IAG Block rated for 625 chp.

By the time I get a spare block on top of rods, pistons and bearings Iím around $1500+. How much machine work would I expect on a used but not damaged ej25 block? Thinking this would end up at least $2000 total- about $500 machine work?
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Old 01-30-2019, 03:53 PM   #2
Waddlz
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Depends on how damaged the block is

I had my 53k miles EJ257 case halves line honed, cleaned, decked and a broken bolt removed/helicoled for $175.

Manley 99.5mm Graded AA/BB pistons
Eagle H-beams
King Rod/main
Reused my Sti crank

Total cost was $~1180 for parts + labor.

but then I scratched cylinder wall really bad when a ring popped out upon assembly and went and bought new case halves for $1000.

Still cheaper than IAG stage 2. but you get that peace of mind that someone who's done thousands of engines and knows what they are doing. Whether or not that is worth it to you, is up to you
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Old 01-30-2019, 04:01 PM   #3
BlueSTI4Me
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Gotta add all the costs. I don't see a gasket kit included. Machining costs can vary widely across towns, cities, states. That $175 quoted above to line hone, deck and clean a block can't be matched in my area (more like $4-$500). If torque plate used to hone cylinders for proper piston fit, that $$$ needs to be added.
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Old 01-30-2019, 04:55 PM   #4
gabo_s13
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My shortblock costs ended up being around $2,600 after all was said and done for parts and machining.

-Hot-tanked/Honed (w/torque plate)/decked seasoned block
-Manley pistons
-Manley H-Tuff rods
-New OEM STI nitrided crank
-ACL Race bearings
-New OEM case bolts

Obviously, this depends on location. I went this route because it made more sense to me than buying an IAG stg 2 SB.
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Old 01-31-2019, 11:46 AM   #5
Drac9
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Building your own shortblock will typically end up around $500-700 less than an IAG block, if you have it professionally machined and assembled. However, there are some caveats to consider.

First, your current block may be no good. Perhaps the cylinders are extremely worn, the main journals are out of whack, etc. The crank will at least need a polish. Replacing components quickly eats into the savings.

Second, the familiarity of the machine shop with Subaru engines and the proper equipment. Most general machine shops will not have Subaru specific torque plates, they may not have built many Subaru engines, etc. IAG has literally built over 4000 Subaru engines. There is not another company other than Subaru themselves that have built more.

Third, the timeline. Many machine shops will take 6+ months to build you an engine with used components.

Finally, the warranty. IAG offers a 12 month, 12,000 mile warranty on their blocks. Most machine shops will not offer any warranty on a "race" engine.
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Old 01-31-2019, 04:42 PM   #6
pcampbell
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Default Newb question on built vs IAG

Thanks for the input. This is the kind of thing I wanted to hear. $500 savings isnít worth it IMO for a bunch of effort that may or may not come out perfectly! $1500 savings is more motivating though.

Last edited by pcampbell; 02-01-2019 at 06:56 AM.
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Old 02-02-2019, 04:25 PM   #7
subaru_gc8
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Quote:
Originally Posted by pcampbell View Post
Need some newb advise on what machining costs on a running EJ 25 motor? Trying to understand cost differences between building a SB with to be decided $400 rods and $600 pistons versus a $3500 IAG Block rated for 625 chp.

By the time I get a spare block on top of rods, pistons and bearings I’m around $1500+. How much machine work would I expect on a used but not damaged ej25 block? Thinking this would end up at least $2000 total- about $500 machine work?
somewhere,around the 500 point, maybe a little less. If you want to know the difference, the difference is a warranty compared to your on your own.
as far as getting the machining done, it all depends daily even with the best machine shops, it all depends on the time they decide to do it or how fatiged the guy that is doing the work is.
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Old 02-02-2019, 11:38 PM   #8
DansharSti04
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Quote:
Originally Posted by pcampbell View Post
Need some newb advise on what machining costs on a running EJ 25 motor? Trying to understand cost differences between building a SB with to be decided $400 rods and $600 pistons versus a $3500 IAG Block rated for 625 chp.

By the time I get a spare block on top of rods, pistons and bearings I’m around $1500+. How much machine work would I expect on a used but not damaged ej25 block? Thinking this would end up at least $2000 total- about $500 machine work?
Check out Revworks and compare. They have their RW750 shortblock rated at 750 chp for $3250.

Last edited by DansharSti04; 02-03-2019 at 07:41 PM.
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Old 02-05-2019, 10:04 AM   #9
Cpsti21
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Quote:
Originally Posted by DansharSti04 View Post
Check out Revworks and compare. They have their RW750 shortblock rated at 750 chp for $3250.
What state is that in?
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Old 02-05-2019, 02:23 PM   #10
1qukSti07
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Quote:
Originally Posted by Cpsti21 View Post
What state is that in?
Florida. https://www.revworksinc.com/

I have not worked with them directly, I was going to get my tune done by them a few years back (they are local to me), but they would not answer my questions and just wanted me to bring the car in. That doesn't work for me- I built the whole car myself (including the short block), I want to know the tuner and such, I'm very involved with my car.

My buddy has had his car sit at their shop for the last 6 months waiting on a rebuild...

Their short blocks are solid, service is not.
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Old 02-13-2019, 10:50 AM   #11
rexmix_svx
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Default Why IAG

I know the stage 1 and 1 plus IAG built shorblocks come with a full instruction manual specific to the level of the parts, it comes with a warranty for up to somewhere around 500chp for I think one year. They tell you every detail about the parts and what to expect while running the motor, yes there are cheaper alternatives that could work just as well, but with IAG you get a peace of mind that your motor wont blow because of a wrist pin clip coming out.
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Old 02-13-2019, 04:31 PM   #12
pcampbell
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Most likely will eventually go with IAG. Thanks all.
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