[IISaiNtII]

I've seen this asked a couple times, once more recently, so I brought this post over from sohchonda, who got it and added to it from atlhonda.

D14A1 (EDM)
1989 Civic GL HB twin carb 5spd ------PM2/E1

D14A3 (EDM)
1997 1.4i HB 5spd-------------------P2A-9
Euro spec D14A3 pre 1988 head code: P2A-9------1500cc GT 3rd gen

D15B1
1990 Std D15B1 4sp--------------PM9-5
1991 Std D15B1 4sp--------------PM9-3

D15B2
88 ?? Hatch Auto------------------PM3-8
90 LX D15B2 5sp------------------PM3-9 (9/0) stamped rs of code
91 CRX DX D15b2 5sp------------PM8-12
93 Civic Eg4 (EDM) D15B2 5sp---PM3-8 (9/4)



D15B6
89 crx hf 5 spd--------------------pm8-2 located above #4 exh runner

D15B7
94 DX D15B7 5sp-----------------PMS-1
95 DX D15b7 5sp-----------------PM9-5
95 LX Sedan 5sp------------------PM9-2

D15B8
92 Civic CX 5sp-------------------PM8-1
D15B8
92 Civic CX H/B manual transmission-------PM8-

D15B (JDM)
92 VTi D15B Auto---------------- P08-1 (9/1)<-- RS of Code

D15B SOHC VTEC 3 STAGE
96 ?? -----------------P2J (9/5) manifold code P2J

D15Z1
92 VX D15Z1 5sp-----------------P07-1

D16A6
88 RT D16A6 Auto----------------PM3-7
90 Si D16A6 5sp------------------PM3-4
90 civic si 5spd-------------------pm3-1


D16Z6
92 Si D16Z6 5sp----------------- P08-2 (9/2) stamped on RS of code.
93 Si D16Z6 5sp------------------P08-4 (9/3) stamped on rs of head
93 EX D16Z6 5spd--------------- P08-4
93 EX D16Z6 5sp-----------------P08-3
94 EX D16z6 5 spd-------------- PO8-2
94 Si D16z6 5sp----------------- P08-3
94 EX D16Z6 5sp-----------------P08-4
94 SI D16z6 5sp ----------------P08-5
95 EX D16Z6 Auto----------------P08-2

D16Y4
96 GLi D16Y4 5sp-----------------P2A-2 "96" stamped on right

D16Y7
97 LX D16Y7 5sp-----------------P2F-HA-2
97 LX D16Y7 Auto----------------P2F-HA-4 also had USA and (9/6) stamped on it
98 DX D16Y7 5sp----------------P2F-HA-3 also has USA and (9/7) stamped on it
00 DX D16Y7 Auto --------------P2F-HA-7


D16Y8
96 EX D16Y8 Auto------P2J-2 stamped 95 on rs of head
97 EX D16y8 5spd-----P2J-4 --- "97" stamped on the right
97 EX D16Y8 Auto-----P2J-6 "97" stamped on rs of head
97 EX D16Y8 Auto-----P2J-7
97 EX D16Y8 5sp-----P2J-6 "96" stamped on right side
97 EX D16Y8 5pd-----P2J-4 (95 stamped on rs)
98 EX D16Y8 Auto-----P23-2
98 EX D16Y8 Auto-----P2J-5 (98 stamped on rs)
99 EX D16Y8 5sp------P2J-4
99 EX D16Y8 5spd-----P2J-7 (99 stamped on rs)
00 EX D16Y8 5sp------P2J-3 "99" stamped on right side
D15b6
89 crx hf 5 spd-------pm8-2 located above #4 exh runner

JDM

THE OBD-II 3 stage VTEC D15B 96^
(2) VTEC solenoids
Head Code "P2J"
year Code "95"
intake mani also stamped "P2J" on the back

OBD-1 SOHC ZC VTEC
Head Code "P08-3"
1996 ^ SOHC ZC NON VTEC
Head Code "P2A-10"
Year Code "98"
several of these with years varying from 96-00
All with head codes from P2A-8, 9 and 10


it should stand to reason that the first three characters (for example, P2A) are primarily the head designation code, and the following letters i assume either deal with date/location the head was made.

if anyone has anything to add, please do so.