Hello. I was wondering if the DOHC heads off my outback will fit a 2.5 block that originally was SOHC? Thanks for your time.
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Guest Message by DevFuse
EJ25 DOHC Heads on SOHC block?
Started by
[HTi]Johnson
, May 23 2007 02:30 PM
4 replies to this topic
#2
ShawnW
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- Administrator
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- 12,955 posts
Subaru Master Technician
- Denver, Colorado
Posted 24 May 2007 - 10:03 PM
Yes. Direct swap no problem.
#3
86BRATMAN
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- Members
- 3,963 posts
Elite Master of the Subaru
- Tazewell Virginia
Posted 24 May 2007 - 10:07 PM
I think the combustion chamber is smaller on the dohc, so you'd have somewhat higher compression ratio after the swap.
#4
ShawnW
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- Administrator
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Subaru Master Technician
- Denver, Colorado
Posted 24 May 2007 - 11:57 PM
Nope just a difference in the pistons themselves but compatible all the same. SOHC pistons are higher compression.
#5
Aspen
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- Members
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- 31 posts
USMB Regular
- Ontario
Posted 25 May 2007 - 12:39 PM
Your new compression ratio will depend on the gasket you use. I suggest a cometic 60 thousands. Should be around 10.6:1. should be good on 89 octane.
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