D series spec sheet
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
STEP4......80ft 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 D16A6,D16Z6 and D16Y8 Cams
Intake.....007-.009" (.17-.22mm)
Exhaust...009-.011" (.22-.27mm)
Head Chamber Volume
D16A6......................38cc
D16Z6 and D16Y7.....34.6cc
D16Y8......................32.8cc
Throttle Body Sizes
D16A6..... 55mm
D16Z6......56mm
D16Y7......56mm
D16Y8..... 56mm
MAIN- ROD BEARING Clearances
On N/a engines that i build I spec to .0015" on all mains and rods
On boosted engines that I build I spec a little looser about .0017-.0022 depending on application, the build, how much boost,etc..
Piston to wall clearances;
3 thousands / Cast piston boosted app
5 thousands / Forged piston boosted app
Camshaft Specs
Special Note:You can use a D16Z Cam in a D16Y Head but you have to use the Cam Gear from a D16Z because it'll be a 1/2 timing tooth off..same goes for D16Y cam in D16Z Head,just use Cam Gear for a D16Y..Do NOT buy any aftermarket Cam Gear for a D16Y from a company if they only have one Cam Gear available for the 88 thru 00 Ds.I recommend and use a AEM Gear,they have the right Cam Gears for 88-95s and 96-00s
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
How to Adjust D16 Valve Clearance
CAUTION: Always rotate engine in direction of normal rotation(counterclockwise as viewed from front of engine). Reverse rotation may cause timing belt to jump time. Rocker Arms are made of aluminum and can be damaged if lock nuts are over tightened so be careful.
Note: Valves should only be adjusted when engine is cold with temp of it less than 100 degrees F.
Step 1...Remove Valve Cover. Remove Upper Timing Belt Cover. Rotate Crankshaft counterclockwise until No. 1 piston is at TDC of the compression stroke. Up mark on camshaft pulley should be on top, TDC marks should align with cylinder head upper surface or TDC groove should align with pointer on back cover. see pic below
Step 2..Loosen adjusting screw lock nut on cylinder No. 1.Adjust valve clearance to spec on all valves for No. 1 cylinder. Turn Adjustment screw until a feeler gauge slides back and forth with a slight drag. Tighten lock nut to spec and recheck valve adjustment. Cylinder No.1 is done
Step 3 Rotate crankshaft counterclockwise 180 degrees(camshaft pulley rotates 90 degrees) Up mark on camshaft pulley should be on the exhaust side. Adjust all valves for Cylinder No.3
Step 4 Rotate crankshaft counterclockwise 180 degrees(camshaft pulley rotates 90 degrees) Up mark on camshaft pulley should be down(both TDC grooves will be visible again).Adjust all valves for Cylinder No.4
Step 5 Rotate crankshaft counterclockwise 180 degrees(camshaft pulley rotates 90 degrees) Up mark on camshaft pulley should be on the intake side. Adjust all valves for Cylinder No.2
Step 6 ..Ensure crankshaft pulley bolt is tightened to spec