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Old 02-12-2019, 03:02 PM   #1
Alejandro_okc
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Default 2005 Sti 182,000 Mile upgrade

Is it extremely difficult to replace a head gasket? I have a couple more things I need to check on my 2005 sti but Iím pretty sure the issue is itís got a blown head gasket. Iíve replaced head gaskets before and have a lot of mechanical experience with Ls and Ford motors. My main question being is it a good idea to do it yourself? I have all the tools and motor stands I would need. Just donít know how hard it is and never been inside of a EJ. Any help and advice would be appreciated. Also what else should I replace while the engineís open? Everyone is saying that while itís open to go ahead and drop Pistons, rods , bearings, and arp hardware. If I were to do that how should I go about it ? Some in my local group say to buy drop in pistons and just get the heads resurfaced and do the pistons and rods yourself and some say to send it to a shop and get it bored to 99.75mm and honed and get built and assembled there? The main thing being that I love learning and want to do as much as I can myself as I SHOULD. Any help and advice will be greatly appreciated.
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Old 02-12-2019, 04:13 PM   #2
Awd.Son
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If you have a lot of mechanical experience you should be able to do anything mechanical. There are plenty of write ups on head gasket issues and how to replace them.
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Old 02-12-2019, 04:16 PM   #3
raisingAnarchy
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CBS

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Check out this video from speed academy. It's not a turbo motor, but the principle is the same I believe.

Speed academy also has videos of splitting and reassembling an EJ207's case halves. There's an older channel called Frugal Garage where a guy plastigauges his EJ257 while reassembling case halves.

Maybe before making a decision and starting a teardown, do a compression and leakdown test to evaluate the health of the pistons and headgaskets. If your pistons are healthy, think about your power goals. Why drop in forged pistons if your stock ones have held up for 185k miles, unless you're about ready to crank up the boost? Also, aren't the 2004-5 factory pistons more robust than later years anyway?
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Old 02-12-2019, 06:14 PM   #4
mrsaturn7085
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+1 to the video above - most head gasket repair 'how-to' videos do not explain the necessity of machine work on the heads. This is 100% a MUST-DO part of the repair on any aluminum head motor.
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Old 02-12-2019, 07:43 PM   #5
Alejandro_okc
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Goal for the car is high 4ís low 5ís.
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