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Old 11-15-2001, 11:19 AM   #14
mrbell
Scooby Specialist
 
Member#: 1871
Join Date: Jul 2000
Location: Salt Lake City, UT
Vehicle:
2000 Impreza 2.5RS
Blue Ridge Pearl

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I believe the heads do affect the compression ratio. 98's and 99's(all 99's, that I am aware of) are both labeled as 9.7:1 compression. and since the block changed mid-99, but the compression did not, it is not something to do w/ bore or stroke. The only other option is the pistons themselves, which did get redesigned, but the heads were a more significant change...
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