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Spool sell CP pistons for RB30/25 or26 in 8.2 or 9.0:1 compression - you want the 9.0:1

Just look through the RB30 Hybrid Upgrade thread. the last one is mine -only 312 AWKW with a stock (low compression) bottom end c/w this example from Proengines 364KW -similar build to mine but with cams and 9:1 pistons:

  • RB30 bottom end
  • Spool Rods
  • Wiseco pistons 9:1
  • ACL race series bearings
  • crank collar, RB25 pump
  • Cometic 1.3mm gasket
  • head ported, std valves
  • vvt removed, Tomei 256 intake cam, HKS 264 exhaust cam
  • fabricated exh manifold, GT35/40 .7 front, .82 rear
  • front facing plenum, std TB

Engine is on boost by 3000, very driveable.
post-8303-1203330564_thumb.jpg

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https://www.sau.com.au/forums/topic/429590-rb2630/page/2/#findComment-6955436
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