The B20 does have a larger bore, but effectivly it has a thinner sleeve because of this. it also does NOT have a closed deck
i beg to differ th B20Z or whatever has a closed deck design the wwater jackets DO NOT havean upper openeing around the Cyl walls. he B18 Series does The design was due to the larger bore and thiner walls as you said ! take a B20 apart and look again your thinking of closed deck by deck heighth definition ! Im a honda tech dont correct me lol jk a zero clearence head has no valve clearance only by recess's in the piston dome ! The Larger B20 would be better for a turbo setup 2.0liters are one of the best displacments for this why do you think every turbo car made by every car company is a two liter !! Nissan Silivia 2.0, 4G63 2.0L Chevy ecotec turbo 2.0L.
But the 1.8 liter is also good like i said before its your wallets desicion ! If it was my engine id go with what i said before.
Sleeving a block can be costly and if they screw up your screwed and there is no way to tell who messed up !! a Block guard IS good for low boost apps it just strengthens the upper cylinder wall where THE COMBUSTION AND PRESSURE tale place a sleeve only covers half a cylinder for that reason !! i wouldnt sleeve unless im boring it ! There are many ways to set this up ! its really up to you how far and which way you wanna do it !.
VTEC shit.. man oh man !!!
I agree with the KEEP IT AT THE REDLINE THE HEAD IS DESIGNED FOR UNLESS !!!!! you rebuild it for more !! Sometimes on larger turbos you need more RPM's a GSR turns what like 7500 rpm turbos balanced engines and high rev cams will take you to 9K and make good power !!
But im gonna say this again ! YOUR WALLET WILL DECIDE !!! and to make everything work it has to be tuned properly to take full advantage of everything !!
But im talking about a bad ass fully built balls to the wall 20psi 9krpm engine !! You can effectivly use ALL stock parts and pump 12psi and push 290whp whcih is more than enough for street use !! thats good 11's !! I have an article on a B20 with type R head all stock internals with a greddy Turbo and has like 290+whp and runs 11's all day long with a HKS ECM and lil crappy bolt on !! it all depends on you !! and your wallet