Wild Bill Robinson, who may have enough stealth equipment to be considered a
risk to national security wrote; "I know that my son's heads say "NA" on
them, which I would interpret as standing for "naturally aspirated" i.e.
non-turbo." (Can someone confirm this for Bill? Are we ruling out NA for
North America?)
Then he asks; "Does anyone know for sure how the WRX solid lifter equipped
quad cam heads differ from their NA counterparts?"
I like this question because a few days ago I asked for feedback on the
potential for a WRX 2.0 head swap vs. a 2.5 swap onto our United States
version 2.2 Turbo Legacy blocks. This is while making the assumption that the
2.0 efficiency should be comparable or better than the 2.5 since the 2.0 WRX
engines were probably designed as recently as the 2.5 engines plus they were
designed with performance in mind rather than shuttling the family to church.
It may also help to know if there are any differences in head configuration
amongst the various WRX versions or at least whether they are all
interchangeable.
Anybody with a pipeline to the braintrust at Subaru (or anywhere) please
inquire.
Meanwhile I will copy this to Cobb Tuning, MRT Performance, Byron Leggett,
Steve Powell, Matt Walters, Matt Scicchitano, and Simon Sirin. Can any (or
all) of you gurus help with the above questions for us please? Us being
members of a Turbo Legacy/Liberty enthusiasts web list, found at:
http://groups.yahoo.com/group/BC-BFLegacyWorks,
with email to and from, BC-BFLegacyWorks@yahoogroups.com
We invite you all to join
Larry Witherspoon
ssspoon@aol.com
92 Legacy Turbo Sedan
Torrance (Los Angeles) California
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swapping heads
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