D series Head code's/Bore/Stroke/Deck Height/Rod Length/head and block compression combo's

Head code………..

D15B2
90 LX D15B2 5sp——-PM3-9 (9/0) stamped rs of code

D15B7
94 DX D15B7 5sp——-PMS-1
95 DX D15b7 5sp——-PM9-5

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

D16A6
88 RT D16A6 Auto——PM3-7

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

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

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
98 EX D16Y8 Auto—–P23-2
99 EX D16Y8 5sp——P2J-4
00 EX D16Y8 5sp——P2J-3 “99” stamped on right side

head and block compression combo's and compression

These are only combinations of 1.6L heads and pistons in 1.6L blocks.
The Y8 and Z6 have the same thickness head gasket.
The A6,A1, and ZC also have the same thickness.
Using either OEM head gasket thicknesses make very little difference in compression. These are only combinations of 1.6L heads and pistons in 1.6L blocks. Using either OEM head gasket thicknesses make very little difference in compression. Be sure to check ANY combination you try!

Head Pistons Compression
Z6 Z6 9.2
Z6 Y8 9.27
Z6 A6 9.7
Z6 ZC 11.58
Z6 86-87 A1 11.27
Z6 88-89 A1 11.58
Y8 Z6 9.51
Y8 Y8 9.6
Y8 A6 10.06
Y8 ZC 12.11
Y8 86-87 A1 11.77
Y8 88-89 A1 12.11
A6 Z6 8.66
A6 Y8 8.73
A6 A6 9.1
A6 ZC 10.7
A6 86-87 A1 10.44
A6 88-89 A1 10.7
A1 Z6 7.89
A1 Y8 7.94
A1 A6 8.24
A1 ZC 9.5
A1 86-87 A1 9.3
A1 88-89 A1 9.5
ZC Z6 7.89
ZC Y8 7.94
ZC A6 8.24
ZC ZC 9.5
ZC 86-87 A1 9.3
ZC 88-89 A1 9.5
All these comparisons are considering that all the stock clearances are retained and stock specs are used.

Now to explaain compression. So you say you heard that a 9.0:1 srp pison is a good rate for a d16 turbo right? But what does that really mean? Let me explain so you can have a better grip on the idea. When you piston stroke is at bottom dead center, let's say there is 90cc of compressed air in the cylinder(this is just an example figure). this is equal to the :1 in the figure. Now, when your motor starts compressing the air on the compression storke, once it reaches top dead center, all the air in the cylinder is now pressed into a volume area of 10cc(once again, just an example figure). you divide the 10cc of TDC into the 90cc of BDC, and there you go…9.0:1! hope this clears up the idea of compression rates on pistons. When you build a stroker motor, the piston's downward movement is increased, allowing more air to be pulled into the motor, which in turn allows for more air to be compressed, which would give you a higher compression rae than what the piston claims. Also, milling the head and decking the block change compression because it is making the “squish area” tighter. All said and done, you can create the compression rate ou want by trying different crank combinations, milling and decking clearences, and head gasket thicknesses. And there you have it, piston compression rates explained!

______Compression______HP___________TQ
D16A6…….9 to 1………..108@6000…….100@5000
D16Z6…….9.2 to 1……..125@6600…….106@5200
D16Y8…….9.6 to 1……..127@6600…….107@5500
Torque Specs
Camshaft Holder 8mm Bolts…..14-15ft lbs
Camshaft Holder 6mm Bolts…..104 inch lbs
Camshaft Pulley Bolt…….27ft lbs
AEM Cam Gear Adjustment Bolts(3 of them)….15ft lbs..apply Loctite “red” to the three retaining bolts
Connecting Rod Nut……..23ft lbs
Crankshaft Pulley Bolt…..119ft lbs(D16A6)…..134ft lbs(D16Z6)
Cylinder Head Bolts for D16A6
step 1…….22ft lbs
step 2…….48ft lbs
Cylinder Head Bolts for D16Z6
Step 1….22ft lbs
Step 2….53ft lbs
Cylinder Head Bolts for D16Y8
step 1(bolts 1-10)….15ft lbs
step 2(bolts 1-10)….36ft lbs
step 3(bolts 1-10)….49ft lbs
step 4(bolts 1 & 2)….49ft lbs
Cylinder Heads …All D ARP Studs
Step 1……15ft lbs
Step 2……30ft lbs
Step 3……62ft lbs
Distributor Mount Bolt….17-18ft lbs
Flywheel Bolt……..87ft lbs
Intake Manifold to Cylinder Head Nut..16ft lbs
Main Bearing Cap Bolt……..47ft lbs(D16A6)……….Step 1…18ft lbs(D16Z6 and Y
Step 2…38ft lbs(D16Z6 and Y
Rocker Arm..D16A6
End Rocker Arm Shaft Cap..9ft lbs
All Others and all D16Z and Y8s……….16ft lbs
Throttle Body Nut…….14-16ft lbs
Timing Belt Adjuster Bolt…..33ft lbs
Valve Adjustment Nut….10ft lbs(D16A6)….14-15ft lbs(D16Z6 and Y

Cylinder Head Specs
Valve Sizes D16A6 Intake……29mm Exhaust….25mm
D16Z6 and Y8 Intake…30mm Exhaust….26mm
Valve Clearance
Stock D16Z6 Cam
Intake…..007-.009
Exhaust…009-.011
Head Chamber Volume
D16A6………………….38cc
D16Z6 and D16Y7…..34.6cc
D16Y8………………….32.8cc

Camshaft Specs
D16A6 Cams
……………………Adv Dur..Dur@.050
…………………… Int/Exh…Int/Exh…Lobe Separation…Gross Lift
Stock D16A6…….222/224..194/196……..110…………….333/362
Crane#251-0010.226/228..200/202……..107…………….384/376
Crane#251-0012.232/234..206/208……..108…………….394/386
Crane#251-0014.232/228..206/202……..110…………….394/376
Crane#251-0016.242/244..216/218……..110…………… 425/416

D16Z6 Cams
Comp Cams and Zex #59100
Adv Duration Duration@.050
___Int/Exh__Int/Exh_Lobe Sep_Gross Lift
PRI..228……..186……..111……….285
SEC.232……..190……..115……….300
VT..256………215……..103……….440
EXH.252……..210……..111……….400
Comp Cams and Zex #59300
Adv Duration Duration@.050
___Int/Exh__Int/Exh_Lobe Sep_Gross Lift
PRI..232……..190……..111……….300
SEC.236……..194……..115……….310
VT…260……..220……..107……….455
EXH.268……..216……..111……….430

D16Y8 Cams
Stock D16Y8 Cam
Adv Duration Duration@.050
___Int/Exh__Int/Exh_Lobe Sep_Gross Lift
PRI..211……..183……..115……….300
SEC.215……..187……..113……….319
VT…247……..217……..114……….397
EXH.235……..204……..110……….370
Crane#252-0010
Adv Duration Duration @ .050
____Int/Exh__Int/Exh__Lobe Sep___Gross Lift
PR…..214………186………108………….319
SEC…218………190………106………….327
VT…..258………224………106………….423
EXH…238………210………114………….386
Crane#252-0012
Adv Duration Duration@.050
____Int/Exh__Int/Exh____Lobe Sep__Gross Lift
PRI…214………186…………..112………..3 19
SEC..218………190…………..110………..32 7
VT….266………232…………..110………..4 43
EXH..246………218…………..114………..40 6