This engine tune-up data reference provides a rigorous, factory-authenticated compendium of primary OE tune-up specifications for vintage and modern internal combustion engines. Designed for engine builders, tuners, and restoration mechanics requiring verified baseline data. All specifications – including spark plug gaps, initial ignition timing, point dwell angles, factory idle speeds, lifter architecture, and valve lash clearances – are sourced directly from primary OEM service manuals, factory technical bulletins, and recognized historical registries.
Ford – USA
Ford Flathead V8
221, 239, 255ci (Early & 8BA Late V8)
PLUG GAP: 0.025″ (Early) / 0.030″ (8BA)
INITIAL TIMING: 4° (Early) / 2° BTDC (8BA)
POINT DWELL: 36° (Dual) / 28° (8BA)
IDLE SPEED: 400 – 475 RPM
LIFTER TYPE: Solid (Non-Adj OE / Adj)
VALVE LASH: 0.012″-0.018″ (Cold)
SPEC: FACTORY OE
Ford Y-Block V8
239, 272, 292, 312 V8
PLUG GAP: 0.034″ – 0.035″
INITIAL TIMING: 3° (Man) / 6° BTDC (Auto)
POINT DWELL: 26° – 28°
IDLE SPEED: 475 – 500 RPM
LIFTER TYPE: Solid (Mechanical)
VALVE LASH: 0.019″ (Hot)
SPEC: FACTORY OE
Ford FE Big Block
352, 390, 427, 428 V8
PLUG GAP: 0.034″ – 0.035″
INITIAL TIMING: 6° BTDC (8°-10° on 427)
POINT DWELL: 27° – 33°
IDLE SPEED: 600 – 700 RPM
LIFTER TYPE: Hydraulic (Solid on 427)
VALVE LASH: Non-Adj (Hyd) / 0.025″ (427)
SPEC: FACTORY OE
Ford Inline-6
144, 170, 200, 250, 300 Big Six
PLUG GAP: 0.034″ – 0.036″
INITIAL TIMING: 6° (Man) / 10°-12° (Auto)
POINT DWELL: 37° – 39°
IDLE SPEED: 500 – 600 RPM
LIFTER TYPE: Hydraulic / Solid (Early)
VALVE LASH: Zero (Hyd) / 0.016″ Hot (Sol)
SPEC: FACTORY OE
Small Block Ford (Windsor)
221, 260, 289, 302 V8
PLUG GAP: 0.034″ – 0.035″
INITIAL TIMING: 6° – 10° BTDC
POINT DWELL: 27° – 31°
IDLE SPEED: 575 – 650 RPM
LIFTER TYPE: Hydraulic (Solid on 289 Hi-Po)
VALVE LASH: Zero + 3/4 Turn / Pos-Stop
SPEC: FACTORY OE
Ford 385 Series Big Block
429, 460 V8
PLUG GAP: 0.034″ (Pts) / 0.044″ (Elec)
INITIAL TIMING: 6° – 10° BTDC
POINT DWELL: 27° – 30° / DuraSpark
IDLE SPEED: 600 – 650 RPM
LIFTER TYPE: Hydraulic
VALVE LASH: Zero (Pos-Stop / Pedestal)
SPEC: FACTORY OE
Small Block Ford (351W / 5.0L HO)
351 Windsor, 5.0L High Output
PLUG GAP: 0.044″ (Carb) / 0.054″ (EFI)
INITIAL TIMING: 10° BTDC (SPOUT Out)
POINT DWELL: 27°-30° / DuraSpark / TFI
IDLE SPEED: 650 – 700 RPM
LIFTER TYPE: Hyd Flat-Tappet / Hyd Roller
VALVE LASH: Zero (Pos-Stop / Pedestal)
SPEC: FACTORY OE
Ford 351C / 351M / 400 V8
335-Series Cleveland & M-Block V8
PLUG GAP: 0.034″ (Pts) / 0.044″ (Elec)
INITIAL TIMING: 6° – 12° BTDC
POINT DWELL: 27°-29° (351C) / DuraSpark
IDLE SPEED: 600 – 650 RPM
LIFTER TYPE: Hydraulic
VALVE LASH: Zero (Pedestal Rockers)
SPEC: FACTORY OE
Ford Modular V8
4.6L / 5.4L (2V, 3V, 4V)
PLUG GAP: 0.054″ (2V/4V) / 0.045″ (3V)
INITIAL TIMING: 10° Base (PCM Controlled)
POINT DWELL: EDIS / COP Ignition
IDLE SPEED: 650 RPM (In Drive)
LIFTER TYPE: Hydraulic Lash Adjuster
VALVE LASH: Non-Adjustable (Hyd)
SPEC: FACTORY OE
Ford Coyote V8
5.0L DOHC Ti-VCT (Gen 1-4)
PLUG GAP: 0.049″ – 0.053″
INITIAL TIMING: Ti-VCT Mapped (PCM)
POINT DWELL: Smart Coil / PCM
IDLE SPEED: 600 – 650 RPM
LIFTER TYPE: Hyd Lash Adjuster / Follower
VALVE LASH: Non-Adjustable (Hyd)
SPEC: FACTORY OE
Ford Voodoo & Predator V8
5.2L Flat-Plane / Supercharged Cross-Plane
PLUG GAP: 0.035″ (GT350) / 0.037″ (GT500)
INITIAL TIMING: Mapped PCM Strategy
POINT DWELL: High-Output COP
IDLE SPEED: 700 – 750 RPM
LIFTER TYPE: Hyd Lash Adjuster / Follower
VALVE LASH: Non-Adjustable (Hyd)
SPEC: FACTORY OE
General Motors – USA
Chevy / GMC Inline-6
216, 235, 261 Stovebolt & 194, 230, 250, 292
PLUG GAP: 0.035″ (Pts) / 0.045″-0.060″ (HEI)
INITIAL TIMING: 0°-5° (216/235) / 4°-8° BTDC
POINT DWELL: 31° – 34° (38°-40° Early) / HEI
IDLE SPEED: 475 – 550 RPM (In Drive)
LIFTER TYPE: Solid (Early) / Hydraulic
VALVE LASH: 0.006″I/0.016″E / Zero + 1 Turn
SPEC: FACTORY OE
Oldsmobile V8
303, 324, 371, 394 & 330, 350, 400, 403, 425, 455
PLUG GAP: 0.030″-0.040″ (Pts) / 0.060″ (HEI)
INITIAL TIMING: 5° – 10° BTDC (12°-14° W-30)
POINT DWELL: 30° (28° – 32° Delco) / HEI
IDLE SPEED: 550 – 650 RPM (In Drive)
LIFTER TYPE: Hydraulic
VALVE LASH: Non-Adj (Shaft / Pedestal)
SPEC: FACTORY OE
Buick Nailhead V8
264, 322, 364, 401, 425 Vertical-Valve V8
PLUG GAP: 0.032″ – 0.035″
INITIAL TIMING: 2.5° – 5° (Early) / 12° BTDC (401/425)
POINT DWELL: 30° (28° – 32° Delco)
IDLE SPEED: 450 – 550 RPM (In Drive)
LIFTER TYPE: Hydraulic
VALVE LASH: Non-Adjustable (Shaft Rockers)
SPEC: FACTORY OE
Small Block Chevrolet (Gen I)
265, 283, 302, 305, 307, 327, 350, 400 V8
PLUG GAP: 0.035″ (Pts) / 0.045″ (HEI)
INITIAL TIMING: 4° – 8° BTDC (8°-12° SHP/LT-1)
POINT DWELL: 28° – 32° (30° Delco) / HEI
IDLE SPEED: 500 – 700 RPM (750-900 Solid)
LIFTER TYPE: Hydraulic (Solid on SHP / Z28 / LT-1)
VALVE LASH: Zero + 3/4 Turn (Hyd) / Per Cam
SPEC: FACTORY OE
Pontiac V8
287, 326, 350, 389, 400, 421, 428, 455 V8
PLUG GAP: 0.035″ (Pts) / 0.060″ (HEI)
INITIAL TIMING: 6° BTDC (9° – 12° Ram Air / HO)
POINT DWELL: 30° (28° – 32° Delco) / HEI
IDLE SPEED: 500 – 650 RPM (750-1000 RA)
LIFTER TYPE: Hydraulic (Solid on 421 SD)
VALVE LASH: 20 lb-ft Bottleneck Stud (Non-Adj)
SPEC: FACTORY OE
Big Block Chevrolet
348, 409 W-Series & 396, 402, 427, 454 Mark IV
PLUG GAP: 0.035″ (Pts / TI) / 0.045″ (HEI)
INITIAL TIMING: 4° – 8° BTDC (8°-12° L78/L72/LS6)
POINT DWELL: 28° – 32° (30°) / K66 TI / HEI
IDLE SPEED: 550 – 700 RPM (800-900 Solid)
LIFTER TYPE: Hydraulic (Solid on L78/L72/L88/LS6)
VALVE LASH: Zero + 3/4 Turn / 0.024″I-0.028″E
SPEC: FACTORY OE
Buick Small & Big Block V8
215, 300, 340, 350 & 400, 430, 455 V8
PLUG GAP: 0.030″-0.035″ (Pts) / 0.060″ (HEI)
INITIAL TIMING: 4° – 6° BTDC (10° Stage 1)
POINT DWELL: 30° (28° – 32° Delco) / HEI
IDLE SPEED: 550 – 650 RPM (In Drive)
LIFTER TYPE: Hydraulic
VALVE LASH: Non-Adjustable (Shaft Rockers)
SPEC: FACTORY OE
Cadillac 390 / 429 V8
390ci & 429ci Early OHV V8
PLUG GAP: 0.035″
INITIAL TIMING: 5° BTDC
POINT DWELL: 30° (28° – 32° Delco)
IDLE SPEED: 480 – 550 RPM (In Drive)
LIFTER TYPE: Hydraulic
VALVE LASH: Non-Adj (Shaft / Pedestal)
SPEC: FACTORY OE
Cadillac 368 / 425 / 472 / 500
Late Series Big Block Cadillac V8
PLUG GAP: 0.035″ (Pts) / 0.060″ (HEI)
INITIAL TIMING: 5° – 8° BTDC (6° on HEI)
POINT DWELL: 30° (28° – 32° Delco) / HEI
IDLE SPEED: 550 – 600 RPM (In Drive)
LIFTER TYPE: Hydraulic
VALVE LASH: Non-Adjustable (Pedestal)
SPEC: FACTORY OE
GM Gen III / IV “LS” V8
4.8L, 5.3L, 5.7L LS1/LS6, 6.0L, 6.2L LS3/LSA, 7.0L LS7
PLUG GAP: 0.040″ (NA) / 0.035″ (LSA/LS9)
INITIAL TIMING: PCM Mapped (24x / 58x CKP)
POINT DWELL: Coil-Near-Plug (CNP / PCM)
IDLE SPEED: 550 – 650 RPM (PCM Target)
LIFTER TYPE: Hydraulic Roller
VALVE LASH: Non-Adj (22 lb-ft @ Base Circle)
SPEC: FACTORY OE
GM Gen V “LT” V8
5.3L L83/L84, 6.2L LT1/LT2/L87, 6.2L LT4/LT5, 6.6L L8T
PLUG GAP: 0.040″ (NA) / 0.032″ (LT4/LT5)
INITIAL TIMING: ECM Mapped (DI + VVT)
POINT DWELL: Smart Coil-Near-Plug (CNP)
IDLE SPEED: 550 – 650 RPM (ECM Target)
LIFTER TYPE: Hydraulic Roller (Std / AFM)
VALVE LASH: Non-Adj (22 lb-ft Pedestal)
SPEC: FACTORY OE
Mopar & AMC – USA
Chrysler Flathead Inline-6
201, 218, 230, 251, 265 L-Head Six
PLUG GAP: 0.025″ (Early) / 0.035″ (1950+)
INITIAL TIMING: TDC – 2° BTDC
POINT DWELL: 35° – 38° (Early) / 36° – 42°
IDLE SPEED: 450 – 500 RPM
LIFTER TYPE: Solid (Adjustable Tappets)
VALVE LASH: 0.008″ In / 0.010″ Ex (Hot)
SPEC: FACTORY OE
Chrysler Early Hemi V8 (Gen I)
241, 270, 315, 325 Dodge / 276, 291, 330, 341 DeSoto / 331, 354, 392 Chrysler
PLUG GAP: 0.035″
INITIAL TIMING: TDC – 6° BTDC (6°-8° on 300)
POINT DWELL: 26°-28° (1-Pt) / 32°-39° (Dual)
IDLE SPEED: 450 – 500 RPM (650 on 300)
LIFTER TYPE: Hydraulic (Solid on 300 / D-500)
VALVE LASH: Zero (Hyd) / 0.015″I-0.024″E (Hot)
SPEC: FACTORY OE
Chrysler “A” Series Poly V8
277, 301, 313, 318, 326 Polyspherical V8
PLUG GAP: 0.035″
INITIAL TIMING: 5° (Man) / 10° BTDC (Auto)
POINT DWELL: 27° – 32°
IDLE SPEED: 500 RPM
LIFTER TYPE: Solid (Mechanical Shaft Rockers)
VALVE LASH: 0.010″-0.013″I / 0.018″-0.021″E (Hot)
SPEC: FACTORY OE
Chrysler B / RB Big Block V8
350, 361, 383, 400 Low-Deck & 413, 426W, 440 Raised-Block
PLUG GAP: 0.035″
INITIAL TIMING: 5° – 12.5° BTDC (TDC-5° CAP/CAS)
POINT DWELL: 28°-32° (1-Pt) / 37°-42° (Dual) / Elec
IDLE SPEED: 500 – 650 RPM (750 on 440-6)
LIFTER TYPE: Hydraulic (Solid on Max Wedge)
VALVE LASH: Non-Adj Shaft (Hyd) / 0.015″I-0.024″E
SPEC: FACTORY OE
Chrysler Slant-6 (G-Engine)
170, 198, 225 “Leaning Tower of Power”
PLUG GAP: 0.035″
INITIAL TIMING: 2.5° – 5° BTDC (TDC on CAP/CAS)
POINT DWELL: 40° – 45° (1960-72) / Electronic
IDLE SPEED: 500 – 550 RPM (650-700 CAP/CAS)
LIFTER TYPE: Solid (1960-80) / Hydraulic (1981+)
VALVE LASH: 0.010″ In / 0.020″ Ex (Hot) / Zero (81+)
SPEC: FACTORY OE
Chrysler LA & Magnum V8
273, 318, 340, 360 LA & 5.2L / 5.9L Magnum
PLUG GAP: 0.035″ (LA) / 0.035″-0.040″ (Magnum)
INITIAL TIMING: 5° – 10° BTDC (PCM on Magnum)
POINT DWELL: 28°-32° (37°-42° Dual) / Electronic
IDLE SPEED: 500 – 650 RPM (750-900 273/340)
LIFTER TYPE: Solid (273) / Hyd (LA) / Hyd Roller
VALVE LASH: 0.013″I-0.021″E (273) / Non-Adj Shaft
SPEC: FACTORY OE
AMC / Jeep Inline-6
199, 232, 258 & 4.0L High Output Six
PLUG GAP: 0.035″
INITIAL TIMING: 5° BTDC (3° Smog / PCM on 4.0L)
POINT DWELL: 31° – 34° (Delco) / BID / PCM
IDLE SPEED: 550 – 600 RPM (650-750 on 4.0L)
LIFTER TYPE: Hydraulic Flat-Tappet
VALVE LASH: Non-Adj (21 lb-ft Bridge / Pedestal)
SPEC: FACTORY OE
Chrysler 426 Street Hemi V8
426ci Gen II Dual-Quad Hemispherical V8
PLUG GAP: 0.035″ (Champion N-10Y)
INITIAL TIMING: 12.5° BTDC (’66-67) / TDC-5° (CAP/CAS)
POINT DWELL: 27°-32° (Each) / 37°-42° (Dual Total)
IDLE SPEED: 750 – 900 RPM
LIFTER TYPE: Solid (’66-69) / Hydraulic (’70-71)
VALVE LASH: 0.028″ In / 0.032″ Ex (Cold) / Zero (’70+)
SPEC: FACTORY OE
AMC Gen 2 & Gen 3 V8
290, 304, 343, 360, 390, 401 V8
PLUG GAP: 0.035″
INITIAL TIMING: 5° BTDC (TDC ’68-69 4BBL / 8°-10° Late)
POINT DWELL: 29° – 31° (Delco) / BID / DuraSpark
IDLE SPEED: 550 – 650 RPM (In Drive)
LIFTER TYPE: Hydraulic Flat-Tappet
VALVE LASH: Non-Adj (Stud Nut / 21 lb-ft Bridge)
SPEC: FACTORY OE
Dodge Viper V10
8.0L SR I/II, 8.3L ZB I, 8.4L ZB II Aluminum V10
PLUG GAP: 0.035″ (8.0L) / 0.040″ (8.3) / 0.050″ (8.4)
INITIAL TIMING: PCM Mapped (DIS / Coil-Pack)
POINT DWELL: Wasted-Spark DIS / Multi-Coil
IDLE SPEED: 600 – 680 RPM (PCM Target)
LIFTER TYPE: Hydraulic Roller
VALVE LASH: Non-Adjustable (Pedestal Rockers)
SPEC: FACTORY OE
Chrysler Gen III Hemi V8
5.7L Eagle, 6.1L SRT8, 6.4L 392 Apache, 6.2L Hellcat / Demon
PLUG GAP: 0.043″-0.045″ (NA) / 0.032″ (6.2L SC)
INITIAL TIMING: PCM Mapped (VVT / Knock Strategy)
POINT DWELL: Dual-Plug COP (16 Plugs Total)
IDLE SPEED: 550 – 650 RPM (700-750 on 6.2L)
LIFTER TYPE: Hydraulic Roller (Std / MDS Deact)
VALVE LASH: Non-Adjustable (Shaft Rockers)
SPEC: FACTORY OE
United Kingdom
Jaguar XK Inline-6
3.4L, 3.8L, 4.2L DOHC Six (XK120 to Series III XJ6)
PLUG GAP: 0.025″ (Pts) / 0.035″ (Elec)
INITIAL TIMING: 5° – 10° BTDC (Varies by CR)
POINT DWELL: 35° – 38° (Lucas 6-Lobe)
IDLE SPEED: 500 – 700 RPM (Dual/Triple SU)
LIFTER TYPE: Solid (Bucket over Shim)
VALVE LASH: 0.004″ In / 0.006″ Ex (Cold)
SPEC: FACTORY OE
BMC / Rover A-Series
848, 948, 1098, 1275cc (Mini, Sprite/Midget, Minor)
PLUG GAP: 0.025″ (Pts) / 0.035″ (Electronic)
INITIAL TIMING: 3° – 6° BTDC (Vacuum Disconnected)
POINT DWELL: 60° (Lucas 4-Lobe 25D/45D)
IDLE SPEED: 750 – 850 RPM
LIFTER TYPE: Solid Flat-Tappet
VALVE LASH: 0.012″ (Cold) / 0.015″ (Cooper S)
SPEC: FACTORY OE
Triumph Standard Inline-4
1991cc & 2138cc (Triumph TR2, TR3, TR4, TR4A)
PLUG GAP: 0.025″ (0.035″ w/ Elec Ignition)
INITIAL TIMING: 4° BTDC (Static)
POINT DWELL: 60° (Lucas 25D4 Distributor)
IDLE SPEED: 800 – 850 RPM (Dual SU / Zenith)
LIFTER TYPE: Solid Flat-Tappet
VALVE LASH: 0.010″ (Cold) / 0.012″ (High Lift)
SPEC: FACTORY OE
BMC B-Series
1489, 1588, 1622, 1798cc (MGA, MGB, Magnette)
PLUG GAP: 0.025″ (’62-74) / 0.035″ (’75+ Elec)
INITIAL TIMING: 10° – 14° BTDC (Varies by Year/Smog)
POINT DWELL: 60° (Lucas 25D / 45D)
IDLE SPEED: 800 – 850 RPM
LIFTER TYPE: Solid Flat-Tappet
VALVE LASH: 0.015″ (Hot or Cold per Leyland)
SPEC: FACTORY OE
Ford Kent & Crossflow
997, 1098, 1340, 1500, 1600cc (Cortina, Escort)
PLUG GAP: 0.025″ – 0.030″
INITIAL TIMING: 8° – 12° BTDC (Static)
POINT DWELL: 58° – 60° (Motorcraft / Lucas)
IDLE SPEED: 800 – 900 RPM
LIFTER TYPE: Solid Flat-Tappet
VALVE LASH: 0.010″ In / 0.014″ Ex (Kent)
SPEC: FACTORY OE
Lotus-Ford Twin Cam
1557cc DOHC (Elan, Cortina, Escort Twin Cam)
PLUG GAP: 0.025″ (Pts)
INITIAL TIMING: 10° – 12° BTDC (Static)
POINT DWELL: 60° (Lucas 23D / 25D)
IDLE SPEED: 900 – 1000 RPM (Weber/Dellorto)
LIFTER TYPE: Solid (Bucket over Shim)
VALVE LASH: 0.005″-0.007″ In / 0.009″-0.011″ Ex
SPEC: FACTORY OE
Rover V8
3.5L, 3.9L, 4.0L, 4.6L (SD1, Range Rover, Morgan)
PLUG GAP: 0.035″ (SU Carb/EFI) / 0.040″ (Thor)
INITIAL TIMING: 6° – 8° BTDC (EDIS on 4.0/4.6)
POINT DWELL: 26°-28° / Lucas 35D8 / GEMS
IDLE SPEED: 750 – 800 RPM
LIFTER TYPE: Hydraulic Flat-Tappet
VALVE LASH: Non-Adj (Shaft Rockers)
SPEC: FACTORY OE
Germany
VW Air-Cooled Flat-4
1192, 1300, 1500, 1600cc (Type 1, 2, 3)
PLUG GAP: 0.024″ – 0.028″ (0.6mm)
INITIAL TIMING: 7.5° BTDC (TDC on Dual Vacuum)
POINT DWELL: 44° – 50° (Bosch 009 / Vacuum)
IDLE SPEED: 800 – 850 RPM (900 on 34 PICT-3)
LIFTER TYPE: Solid Flat-Tappet
VALVE LASH: 0.006″ In / 0.006″ Ex (Cold)
SPEC: FACTORY OE
Porsche Air-Cooled Flat-6
2.0L, 2.2L, 2.4L, 2.7L, 3.0L, 3.2L (911)
PLUG GAP: 0.028″ (0.7mm)
INITIAL TIMING: 5° ATDC (Idle) / 35° BTDC @ 6000 RPM
POINT DWELL: 38° ± 3° (Bosch Distributor)
IDLE SPEED: 900 – 950 RPM
LIFTER TYPE: Solid (Rocker Arm with Swivel Foot)
VALVE LASH: 0.004″ (0.1mm) In/Ex (Cold)
SPEC: FACTORY OE
BMW M10 / M30 SOHC
1.6L-2.0L M10 Four & 2.5L-3.5L M30 Six (2002, E9, E28)
PLUG GAP: 0.024″ – 0.028″ (0.6mm – 0.7mm)
INITIAL TIMING: 25° BTDC @ 3000 RPM (Steel Ball Mark)
POINT DWELL: 59° – 65° (Bosch)
IDLE SPEED: 850 – 900 RPM
LIFTER TYPE: Solid (Eccentric Adjuster)
VALVE LASH: 0.006″ – 0.008″ (0.15 – 0.20mm) Cold
SPEC: FACTORY OE
Mercedes-Benz M117 V8
4.5L, 5.0L, 5.6L SOHC V8 (W108, W116, W126, R107)
PLUG GAP: 0.032″ (0.8mm)
INITIAL TIMING: TDC (Static) / EZL Mapped (Late 5.6L)
POINT DWELL: Transistorized Switchgear / EZL
IDLE SPEED: 650 – 750 RPM
LIFTER TYPE: Hydraulic (Solid on early 3.5/4.5)
VALVE LASH: Non-Adj (Hydraulic Compensators)
SPEC: FACTORY OE
VW / Audi EA888 (Gen 1-4)
1.8T & 2.0T TSI / TFSI (Golf, GTI, A3, A4)
PLUG GAP: 0.028″-0.032″ (0.024″ on Stage Tunes)
INITIAL TIMING: Motronic ECU Mapped (VVT)
POINT DWELL: Coil-on-Plug (Smart Coil)
IDLE SPEED: 750 – 800 RPM (ECU Target)
LIFTER TYPE: Hydraulic Roller Finger Follower
VALVE LASH: Non-Adjustable (Hyd Lash Adjuster)
SPEC: FACTORY OE
Italy
Ferrari Colombo V12
3.0L, 3.3L, 4.0L, 4.4L SOHC / DOHC (250, 275, 330, 365)
PLUG GAP: 0.022″ – 0.025″ (0.6mm)
INITIAL TIMING: 10° BTDC @ 1000 RPM (Static ~TDC)
POINT DWELL: 34° (Dual Point/Twin Marelli)
IDLE SPEED: 900 – 1000 RPM (Weber Triple/Six)
LIFTER TYPE: Solid (Roller Follower / Hairpin)
VALVE LASH: 0.008″ In / 0.010″ Ex (Cold)
SPEC: FACTORY OE
Alfa Romeo Bialbero
1300, 1600, 1750, 2000 DOHC (Giulia, Spider, GTV)
PLUG GAP: 0.025″ (Golden Lodge)
INITIAL TIMING: ‘F’ Mark @ Idle (Varies by Dist)
POINT DWELL: 60° (Marelli / Bosch)
IDLE SPEED: 800 – 900 RPM (Weber/SPICA)
LIFTER TYPE: Solid (Bucket over Shim)
VALVE LASH: 0.017″ In / 0.019″ Ex (Cold)
SPEC: FACTORY OE
Fiat Lampredi DOHC
1438, 1592, 1756, 1995cc Twin Cam (124 Spider, 131)
PLUG GAP: 0.027″ – 0.031″ (0.7-0.8mm)
INITIAL TIMING: 10° BTDC @ 800 RPM (Static)
POINT DWELL: 55° – 60° (Bosch / Marelli)
IDLE SPEED: 850 – 900 RPM
LIFTER TYPE: Solid (Bucket over Shim)
VALVE LASH: 0.016″ – 0.018″ In / 0.018″ – 0.020″ Ex
SPEC: FACTORY OE
Ferrari / Maserati F136 V8
4.2L, 4.3L, 4.5L, 4.7L DOHC (F430, 458, GranTurismo)
PLUG GAP: 0.024″ – 0.028″ (0.6 – 0.7mm)
INITIAL TIMING: Bosch Motronic Mapped (VVT)
POINT DWELL: Coil-on-Plug (Smart Coil)
IDLE SPEED: 800 – 850 RPM (ECU Target)
LIFTER TYPE: Hydraulic Roller Finger Follower
VALVE LASH: Non-Adjustable (Hyd Lash Adjuster)
SPEC: FACTORY OE
Sweden
Volvo B18 / B20 OHV
1.8L & 2.0L Pushrod Inline-4 (Amazon, P1800, 140)
PLUG GAP: 0.028″ – 0.032″ (0.7-0.8mm)
INITIAL TIMING: 10° – 12° BTDC @ 1500 RPM (Vac Off)
POINT DWELL: 59° – 65° (Bosch / 62° Ideal)
IDLE SPEED: 700 – 800 RPM
LIFTER TYPE: Solid Flat-Tappet (OHV)
VALVE LASH: 0.016″ – 0.018″ (0.40 – 0.45mm) Cold
SPEC: FACTORY OE
Volvo “Redblock” OHC
B21, B23, B230 8-Valve (240, 740, 940)
PLUG GAP: 0.028″ – 0.032″ (0.7-0.8mm)
INITIAL TIMING: 12° BTDC @ 750 RPM (EZK / LH-Jet)
POINT DWELL: Electronic (Bosch Breakerless / EZK)
IDLE SPEED: 750 ± 50 RPM
LIFTER TYPE: Solid (Bucket over Shim)
VALVE LASH: 0.014″ – 0.016″ (0.35 – 0.40mm) Cold
SPEC: FACTORY OE
Volvo “Whiteblock” Inline-5
2.3L, 2.4L, 2.5L DOHC (850, S70, V70, S60)
PLUG GAP: 0.028″ (Turbo) / 0.032″ (NA)
INITIAL TIMING: Motronic Mapped (VVT on later RN)
POINT DWELL: Coil-on-Plug (Motronic ME7)
IDLE SPEED: 850 RPM (ECU Target)
LIFTER TYPE: Hydraulic (’93-’98) / Solid Tappet (’99+)
VALVE LASH: Non-Adj (Early) / Selective Bucket (Late)
SPEC: FACTORY OE
Saab H-Engine (B201 / B202)
2.0L 8V & 16V Turbo (Classic 900)
PLUG GAP: 0.024″ – 0.028″ (NGK BCP7EV)
INITIAL TIMING: 16° BTDC @ 850 RPM (w/ Vac Adv Off)
POINT DWELL: Bosch Hall Effect / EZK
IDLE SPEED: 850 ± 50 RPM (AIC Controlled)
LIFTER TYPE: Solid (8V) / Hydraulic (16V B202)
VALVE LASH: 0.008″ In/Ex (8V) / Non-Adj (16V)
SPEC: FACTORY OE
Saab Trionic B204 / B234
2.0L & 2.3L DOHC 16V (9000, NG900, 9-3)
PLUG GAP: 0.035″ – 0.039″ (1.0mm – Trionic Sens.)
INITIAL TIMING: Trionic Mapped (Ion-Sensing)
POINT DWELL: Direct Ignition Cassette (DIC)
IDLE SPEED: 800 – 850 RPM
LIFTER TYPE: Hydraulic Flat-Tappet
VALVE LASH: Non-Adjustable (Hyd Lash Adjuster)
SPEC: FACTORY OE
Japan
Datsun / Nissan L-Series
L16, L18, L20B Four & L24, L26, L28 Six (510, 240Z-280Z)
PLUG GAP: 0.031″ – 0.035″ (0.8mm)
INITIAL TIMING: 10° BTDC (Varies 7°-10° by Emissions)
POINT DWELL: 35° – 40° (Pts) / Transistorized
IDLE SPEED: 700 – 800 RPM
LIFTER TYPE: Solid (Rocker Arm / Lash Pad)
VALVE LASH: 0.010″ In / 0.012″ Ex (Hot)
SPEC: FACTORY OE
Toyota R-Series
20R, 22R, 22R-E 2.4L SOHC (Hilux, Pickup, Celica)
PLUG GAP: 0.031″ (0.8mm)
INITIAL TIMING: 5° BTDC (w/ TE1-E1 Diagnostic Jumped)
POINT DWELL: Electronic / Toyota Igniter
IDLE SPEED: 750 – 800 RPM
LIFTER TYPE: Solid (Adjustable Rockers)
VALVE LASH: 0.008″ In / 0.012″ Ex (Hot)
SPEC: FACTORY OE
Mazda Wankel Rotary
12A, 13B, 13B-REW (RX-2, RX-3, RX-7)
PLUG GAP: 0.040″ (Trailing) / 0.040″ (Leading)
INITIAL TIMING: 5° ATDC (Lead Yellow) / 20° ATDC (Trail Red)
POINT DWELL: Electronic / Dual Igniter
IDLE SPEED: 750 – 800 RPM
VALVETRAIN: N/A (Rotary Port Induction)
VALVE LASH: N/A (No Valves)
SPEC: FACTORY OE
Honda B-Series DOHC VTEC
B16A, B18C1, B18C5 (Civic Si, Integra GS-R / Type R)
PLUG GAP: 0.040″ – 0.044″ (1.1mm)
INITIAL TIMING: 16° ± 2° BTDC (Service Jumper Connected)
POINT DWELL: ICM Module / Distributor
IDLE SPEED: 750 ± 50 RPM
LIFTER TYPE: Solid (VTEC Rocker Arm / LMA)
VALVE LASH: 0.006″-0.007″ In / 0.007″-0.008″ Ex (Cold)
SPEC: FACTORY OE
Toyota JZ Series Inline-6
1JZ-GTE (2.5L) & 2JZ-GE / 2JZ-GTE (3.0L) (Supra, IS300)
PLUG GAP: 0.043″ (NA) / 0.031″ (Turbo)
INITIAL TIMING: 10° BTDC (TE1-E1 Jumper Installed)
POINT DWELL: Wasted Spark / Coil-on-Plug
IDLE SPEED: 650 – 750 RPM
LIFTER TYPE: Solid (Bucket over Shim)
VALVE LASH: 0.006″-0.010″ In / 0.010″-0.014″ Ex (Cold)
SPEC: FACTORY OE
Nissan RB Series Inline-6
RB20, RB25DET, RB26DETT (Skyline GTS-T / GT-R)
PLUG GAP: 0.031″ (0.8mm for Boost)
INITIAL TIMING: 20° BTDC ± 2° (Adjustable CAS)
POINT DWELL: PTU / Coil-on-Plug
IDLE SPEED: 900 – 950 RPM
LIFTER TYPE: Solid (Bucket over Shim)
VALVE LASH: 0.014″ – 0.015″ (0.37mm) In/Ex (Cold)
SPEC: FACTORY OE
Subaru EJ Series Flat-4
EJ205, EJ255, EJ257 (Impreza WRX / STI)
PLUG GAP: 0.028″ – 0.031″ (0.7-0.8mm)
INITIAL TIMING: ECU Mapped (AVCS Controlled)
POINT DWELL: Coil-on-Plug (Smart Coil)
IDLE SPEED: 700 – 750 RPM
LIFTER TYPE: Solid (Shimless Bucket / Early Shim)
VALVE LASH: 0.008″ In / 0.014″ Ex (Cold)
SPEC: FACTORY OE
Additional regional accordion modules (European, UK, Asian, and Australian engine families) are in development. All baseline specifications reflect stock factory OE configuration unless otherwise noted via primary technical bulletins.