awesome cheers for ya help bud

Closed deck



Semi-closed deck



See how the closed deck has lots of materials around the bores, where as the semi-closed deck just has reinforcement ribs? That is the difference.

An open deck block is as below



No reinforcement ribs or closed decking around the tops of the bores.

It doesnt matter what you've got, unless your making ridiculous power and running HEAPS of boost (30 psi and above) in a race application, where some sort of reinforcement will help in preventing bore shift.

Hahah beat u to it joe :P Google actually answers some questions

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- White 'Bug Eye' STi -

No, Google only provides the pictures...I answer the questions

Yummy!

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MY09 Evo X - 1.6bar@3500rpm - got lag?
Barbagallo - 56.03 (S); 1:08.09 (L)
Collie - 50.77
Possibly the most under-driven Evo X in the world??

damn... there is a fair amount of difference there... is there a thread on all this i am guessing there is?

i want to know which wrx has which deck?

Fairly simple answer to that.

Liberty RS = closed deck
MY94-MY05 WRX = open deck
MY06 WRX = semi closed deck
MY02 onwards STi = semi closed deck

As for the Jap models, I know some of the early RAs had closed deck but I couldn't tell you which ones.

liberty RS - closed deck
STI V2, V3 - closed deck
All WRX - open deck (cept the 2.5's- who cares!)
STI V4,5,6- open deck
STI V7,8,9 - semi closed

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Long live the WRC

therefore why is everyone a fan of the 02STI onwards engine when a closed deck has more reinforcement?

finding a closed deck in good condition is difficult, plus 02 sti comes with factory forged pistons.
prior to this, they were ceramic (telfon) coated only.

semi-closed deck still takes over 30psi without issue.

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Long live the WRC