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Old 11-15-2001, 08:53 AM   #12
Richard L.
Scooby Specialist
Member#: 8465
Join Date: Jul 2001
Chapter/Region: NWIC
Location: Puget Sound, WA
'00 2.5RS Coupe, AW
'93 GMC Typhoon AWD


Originally posted by bsquare
Changing the heads on the EJ25 doesn't change the compression ratio. You'll still be at 9.7:1.
Actually, changing the heads could change the compression ratio. Compression ratio is a function of cylinder bore, stroke length, cylinder head volume, deck height, head gasket thickness.

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