Does anyone here know if a D16 Head will fit on a D15 Block? I was told it would but im not sure if I belive it or not. Someone confirm the truth

What year, which D15/D16? For example, the D16a1, D16A6, and D16Y8 motors all have different heads.

The only other head that will fit on the 84-87 D15A3/EW motor is a DOHC D16A1 head which is called a Hydra swap. You will however have to construct your own bracket for the timing belt tensioner pulley. This swap is for people who are up to a challenge and don't want to bother swapping the whole D16A1 motor. NO OTHER D-SERIES HEAD WILL FIT ON THE 84-87 D15/EW MOTOR!

What year, which D15/D16? For example, the D16a1, D16A6, and D16Y8 motors all have different heads.

The only other head that will fit on the 84-87 D15A3/EW motor is a DOHC D16A1 head which is called a Hydra swap. You will however have to construct your own bracket for the timing belt tensioner pulley. This swap is for people who are up to a challenge and don't want to bother swapping the whole D16A1 motor. NO OTHER D-SERIES HEAD WILL FIT ON THE 84-87 D15/EW MOTOR!


I have the 87 D15A1 FI I have the SI CRX so is that different from the D15/EW

The Engine is a D15A1 In the Si Model

Where does it say D15A1? The '87 SI came with a D15A3. Either way, except for the 1300cc, the stock engine blocks for any 84-87 Civic/CRX are all the same. The EWx designation was changed to D15xx in '87, the Honda D-series motor changed completely in '88, and Acura changed from D-series to B-series in '90.

Basically what this means is that if you've got the stock SI motor in your car, no '88+ Honda D-series head will fit on your motor.

what is the difference between the d15a3 head and the d16a1 head?

what is the difference between the d15a3 head and the d16a1 head?
The D16A1 is a DOHC motor. The head will fit on a 84-87 EW/D15 motor, but there is some fabrication to get it to work. IMO, it's better to just swap the whole D16A1!