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Old 05-29-2009, 04:59 PM   #1
OjackNjackE
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Impreza GC8 What do you think...

I have a 2000 2.5rs with an EJ251 and was just wondering how much it would cost really for STI internals for block and if it is worth it to run the stock head with maybe a street cam because it is a SOHC and all.

thanks
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Old 05-31-2009, 10:15 AM   #2
Odyknuck
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Quote:
Originally Posted by OjackNjackE View Post
I have a 2000 2.5rs with an EJ251 and was just wondering how much it would cost really for STI internals for block and if it is worth it to run the stock head with maybe a street cam because it is a SOHC and all.

thanks
I have seen used STI short blocks on ebay for 500 to 900. I also seen a brand new one for 1800.00
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Old 06-05-2009, 08:18 AM   #3
OjackNjackE
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Quote:
Originally Posted by Odyknuck View Post
I have seen used STI short blocks on ebay for 500 to 900. I also seen a brand new one for 1800.00
And that would pretty much bolt right up to my stock heads? And all else I would have to change out is my intake manifold, fuel system (injectors, rail(s) and stuff like that), the obvious transmission modifications and exhaust setup?
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Old 06-05-2009, 09:12 AM   #4
bape-ape
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They will bolt up. The rest of the parts depend on what kind of power you want to make. Any EJ block will bolt to any EJ heads.
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Old 06-05-2009, 09:18 AM   #5
OjackNjackE
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Quote:
Originally Posted by bape-ape View Post
They will bolt up. The rest of the parts depend on what kind of power you want to make. Any EJ block will bolt to any EJ heads.
Sweetness thanks for the chime in here. Are there any other parts I would be missing on this overhaul that are not directly related to the block or head?

Thanks
-Jack
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Old 06-05-2009, 01:32 PM   #6
IllNastyImpreza
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the sti block will bolt right onto your stock heads no problem. its a great way to go actually. As far as your heads are concerned, its the biggest place for power gains, but also the biggest way to kill reliability of your engine. As soon as you start upgrading head internals you put alot of stress on all the other stock parts. IE high lift/duration cams put more stress on your springs which WILL wear them out FAST! Then once you start upgrading to stiffer springs your buckets are subjected to a GREATLY increased workload, they will be MUCH more prone to breaking. Basicly, once you touch the head internals its a BIG project that never ends. I know Cunningham chooses to run stock valve springs due to reliablity and just replaces them every 15k miles IIRC. A nice set of cams will give you some SERIOUS HP. But other people choose to just run a bigger turbo... IE zephyr with the slingshot was makin like 500 HP WAY back in the day on a basicly stock ej22t block on an otherwise completely STOCK engine. I think he's running the sti block now.

Just remember you're going to need to upgrade your drivetrain as well, it simply can not handle the shock from launches. You can find a good 05 LGT 5MT for less than 1,000 bucks. I am running one in my RS. I have NOT heard of ANYONE breaking one yet. These use the same gears that the 08+ wrx uses, and they have the upgraded double cone syncros for better meshing.

Last edited by IllNastyImpreza; 06-05-2009 at 01:39 PM.
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Old 06-05-2009, 08:26 PM   #7
Forester_007
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Quote:
Originally Posted by IllNastyImpreza View Post
the sti block will bolt right onto your stock heads no problem. its a great way to go actually. As far as your heads are concerned, its the biggest place for power gains, but also the biggest way to kill reliability of your engine. As soon as you start upgrading head internals you put alot of stress on all the other stock parts. IE high lift/duration cams put more stress on your springs which WILL wear them out FAST! Then once you start upgrading to stiffer springs your buckets are subjected to a GREATLY increased workload, they will be MUCH more prone to breaking. Basicly, once you touch the head internals its a BIG project that never ends. I know Cunningham chooses to run stock valve springs due to reliablity and just replaces them every 15k miles IIRC. A nice set of cams will give you some SERIOUS HP. But other people choose to just run a bigger turbo... IE zephyr with the slingshot was makin like 500 HP WAY back in the day on a basicly stock ej22t block on an otherwise completely STOCK engine. I think he's running the sti block now.

Just remember you're going to need to upgrade your drivetrain as well, it simply can not handle the shock from launches. You can find a good 05 LGT 5MT for less than 1,000 bucks. I am running one in my RS. I have NOT heard of ANYONE breaking one yet. These use the same gears that the 08+ wrx uses, and they have the upgraded double cone syncros for better meshing.
SOHC got buckets? I think not, also upgrading your valvetrain is a good thing, how could upgrading valvetrain affect reliabity in a negative way on a SOHC? Is better getting STI shortblock with your SOHC heads, thats what I am doing with my SOHC worked heads with upgraded valvetrain + STI block. Pretty reliable setup , no need for a full swap.
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Old 06-05-2009, 08:34 PM   #8
OjackNjackE
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Impreza GC8

Quote:
Originally Posted by IllNastyImpreza View Post
the sti block will bolt right onto your stock heads no problem. its a great way to go actually. As far as your heads are concerned, its the biggest place for power gains, but also the biggest way to kill reliability of your engine. As soon as you start upgrading head internals you put alot of stress on all the other stock parts. IE high lift/duration cams put more stress on your springs which WILL wear them out FAST! Then once you start upgrading to stiffer springs your buckets are subjected to a GREATLY increased workload, they will be MUCH more prone to breaking. Basicly, once you touch the head internals its a BIG project that never ends. I know Cunningham chooses to run stock valve springs due to reliablity and just replaces them every 15k miles IIRC. A nice set of cams will give you some SERIOUS HP. But other people choose to just run a bigger turbo... IE zephyr with the slingshot was makin like 500 HP WAY back in the day on a basicly stock ej22t block on an otherwise completely STOCK engine. I think he's running the sti block now.

Just remember you're going to need to upgrade your drivetrain as well, it simply can not handle the shock from launches. You can find a good 05 LGT 5MT for less than 1,000 bucks. I am running one in my RS. I have NOT heard of ANYONE breaking one yet. These use the same gears that the 08+ wrx uses, and they have the upgraded double cone syncros for better meshing.
So if I would do the cams I'm basically looking into replacing the springs, buckets and values at least. Now would USDM STI parts fit into my head even if my car is SOHC and that is DOHC? It seems there are just too many options here sometimes originally I didn't want to upgrade to a larger tubro and just use an STI stock fuel system and stock block with stock internals and a stock tubro (or something similiar) and try to get something like 350 WHP by upgrading other parts like exhaust, intake, FMIC and the cam.

As for the drivetrain I was looking into an RA gear swap with a stage 1 or 2 clutch do to cost, but the 05 LGT 5sp sounds like a lot of fun for >$1,000
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Old 06-05-2009, 08:37 PM   #9
OjackNjackE
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Quote:
Originally Posted by Forester_007 View Post
SOHC got buckets? I think not, also upgrading your valvetrain is a good thing, how could upgrading valvetrain affect reliabity in a negative way on a SOHC? Is better getting STI shortblock with your SOHC heads, thats what I am doing with my SOHC worked heads with upgraded valvetrain + STI block. Pretty reliable setup , no need for a full swap.
What all did you replace in your SOHC heads and about how much did it run you? If you don't mind me asking?
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