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Yes the valves are slightly larger on the heads. 1.83" on intake (1.80" on L36) and 1.52" on the exhaust side was a change made in 2003 on the L36 and continued with the L26
NO the compression ratio is not higher in the L26 motor
The only changes from L36 that are in the L26 are:
Drive by wire Electronic throttle control
Returnless Fuel injection system
Aluminum Upper intake
Improved intake ports
Stronger forged connecting rods
Both the L36 and L26 have 9.4:1 compression
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1998 Grand Prix GT (Retired)
13.689@97.54 1.953 60' Naturally Aspirated
12.233@111.04 1.812 60' Nitrous
IS3 N/A Cam | IS3 Heads milled .060 | Ported LIM | SLP Headers | AL 103's | MSD Coils | Intense Race Trans | 3.69's | 4000 Stall ATI | HV3 | 1.7/1.8 RR's | Borla Cat-back | FWI | Electric WP |
2001 Grand Prix GTP
13.860@100.34 2.072 60'
SLP Headers | AL 104's | FWI | 180* | Borla Cat-back | PCM | 3.4 MPS |
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Linear Mode
