I'm hoping someone can point me in right direction. I've got a few questions in regards to an H22 'closed-deck' block and cylinder head. I'm wondering if the factory service manual for the H22a 'open-deck' block has the same specifications (clearances) as the closed-deck one? I ask because I have the USDM manual only.

I'm not concerned about piston related info as this block has been sleaved (89mm) and a set of Wiseco 8.5:1 pistons are going in. P/W clearance is .0035 and I'm going to set the ring end-gaps file-to-fit. The stock crank and the Eagle rods are all balanced and retain standard size journals (un cut).

Most importanly, I need to know if there are any differences between open vs closed deck:

1.) rod and crank journal clearances, and
2.) cam journal clerances
3.) valve lash

My second question concerns the cylinder head. It's got Crower Stage 2 cams along with dual springs and retainers that are going in. It's been slightly decked and has a port job. Will the camshafts or dual springs require any special attention concerning setting the lash? Anything else that might be helpful.

Any help is appreciated

 

h22a1 IS closed deck.

 

Ahhh, looks like there was a USDM H22a closed deck (a1 model) and an open one (a model). I know the later model ones were open. If this is the case then the FSM should be dead on. I was told that the block was a JDM version though hence the reason for the questions. I'm not sure if the source knew for certain but that's what he thought he was getting. I've built several Subaru motors so I'm not as up on my Honda nomenclature

 

USDM H22A1 = Closed Deck
JDM H22A = Closed Deck
USDM H22A4 = Open Deck