Quote:
Originally Posted by Nigelr32
No way. I have no idea when the change was made, I just noticed the difference on a rebuild of my 2012 engine. I believe there were issues with the cam timing? This may be something to do with it??
I have a 2012 and a 2014, this is how I found the difference. The earlier engines have a different part no for left and right rocker posts, later they're the same.
Heres a pic of the left and right next to each other.. |
Good catch.
A few tidbits here as we're tearing down into a 3rd FA20 just in the last 4 weeks...
2014/07 appears to be the cutoff for when subaru had a field day and made some major changes to the FA20. Valves, valve stem seals, rocker oilers, rockers all appear to have changes right around there (though could have been in steps). We still have to measure the 3rd fa20 (15 wrx) to see where they left off there, but clearly subaru had enough reason to change around the whole head specification. While we can't speculate exactly what the reasons may be, I think it is fair to say that the later motors have had some additional input in regards to what the engineers think is a better approach.
FYI for those doing this themselves, the VIN based parts lookup is not accurate here. Valve lenghts, stem seal bore, and rocker specs need to be measured.