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Guest Message by DevFuse

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what ej heads can be swapped

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3 replies to this topic

#1 LPGsuperchargedBrumby


    Fully retarded and low on compression

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  • Dunedin, NZ

Posted 01 September 2005 - 02:22 AM

like the title says,im wanting to know what heads will swap with what...am i right in thinking all sohc heads will swap with all other sohc heads and that its the same with dohc heads...but that sohc and dohc won't interchange with each other.

i more interested in sohc stuff but it would be nice to know if i could slot sohc heads on a dohc block, as the dohc blocks a way easy'r to get hold of

#2 offroadsubaruguy


    Subaru Nut

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  • arvada, colorado

Posted 01 September 2005 - 05:49 AM

subaru's are like legos. you can interchange just about everything. all sohc heads can interchange with each other, and all dohc heads can interchange with each other, you can even swap a sohc setup for a dohc setup. every single one of the ej motors is the same block, just different amounts of bore and stroke make up the larger motors...

#3 Legacy777



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Posted 01 September 2005 - 12:06 PM

Before anyone says anything will swap with anything.....what year/model engine do you have, and what are you looking to swap.

Whether the engine is n/a or turbo brings in complexities, as well as what phase it is, exhaust port (single or dual port), intake manifold fitment, etc.

#4 blitz



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Posted 01 September 2005 - 08:55 PM

You'll need to be concerned with the resulting compression ratio because the larger displacement motors have greater combustion chamber volume.

I think that if you swap a set of 2.5 heads onto a 2.2 you'll drop the compression and up the flow - great for a F/I buildup, but not good for a N/A buildup.

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