I have an 89 Crx HF, and I was wondering if I could put a d16a6 head on my d15a6 block? I've found an a6 head for dirt cheap. Is it possible? If so what do I need to do?

 

You can swap the head onto your B6 but you'll need to make sure you have the 16 valve pistons (PM3) installed first.

 

I realize thread is old, but would I be correct in assuming same is true for z6 head, or any 16v head for that matter?

 

Yes.

 

Don't want to start a new thread for this so i just bought a d15b6 motor and its got a d16a6 head on it but they didn't swap the pistons over. So i want to know would this cause immediate damage upon start up or something that would take time to happen.

 

Immediate. Think about it, if the piston only accomodates 2/4 valves, would do you think will happen to the 2 valves that don't have relief cuts in the piston?

 

That's what i thought but apparently this guy has been driving this car around for least a year like this. So idk

 

You sure? Maybe you might wanna verify things for yourself. Or maybe we're all wrong and it's fine to use 8 valve pistons.

 

Yeah i took a look at the pistons and there stock. I even heard the car start before i bought it and it sounded fine so didn't think anything of it till i took a closer look but **** i guess if it ran fine I'll just run it as is and see what happens. I'll Also check what the compression is at when i start it up.

 

So the pistons only had two valve reliefs each? And he had the head seperated to show you? And you saw 16 valves? And you saw him reassemble and fire the car up?

 

Yes only 2 relief valves and no he didn't take it apart and show me he just started it. I took a look at all that when i got back and that's when i realized the pistons were stock and yeah theres 16 valves.

 

So you took it apart then after you got home?

 

Yes

 

Well maybe you just proved you don't need to swap pistons? Any chance you can take pictures and post them? Any evidence that the pistons are coming into contact with the valves at all?