3800 wiki

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3800 Series 2/3 engine bolt sizes

Block and Timing Cover

Location	Thread Size, Length, and count
Main bearing cross-bolts	`M8x1.25 @ 50mm (6x)`
Oil pan to block	`1/4-20 @ 1“ (20x)`
Timing cover to block bolts	`5/16-18 @ 3.125” (6) - - @1.5“ (4)`
A/C bracket and RWD Motor mount bolts	`M12x1.75 @ 35mm (3)`
Starter motor	`M10x1.5 @ 50mm (1) - - @ 115mm (1)`
Battery cable to block	`M10x1.5 @ 20mm (1)`
EGR to block	`3/8-16 @ 1” (2)`
Engine bracket to block	`M10x1.5 @ 70mm (1) - - @ 75mm (1) - - M12x1.75 @ 130mm (1)`
Power steering to block (bracket)	`M8x1.25 @ 75mm (2)`
Power bracket to block ('00+)	`M8x1.25 @ 80mm (1) - - @ 25mm (2)`
Oil filter bracket to timing cover	`5/16-18 @ 1.5“ (4)`
water pump bolts	`1/4-20 @ 1.125” (4) - - 5/16-18 @ 3“ (4)`
Cam sensor bolt	`1/4-20 @ 5/8” (1)`
Flexplate to crank (auto trans cars)	`5/16-18 @ (1/2“?, 5/8”?, or 3/4“?) (8)`
Flywheel to crank (manual trans only)	`5/16-18 @ 7/8” (8)`
Pressure plate to Flywheel (manual trans only)	`M8x1.25 @ 22mm (6)`
Oil level sensor thread size	`M20x1.5`
Bellhousing bolts	`M12x1.75 @ ??`

Heads

Location	Thread Size, Length, and count
Valve cover bolts	`1/4-20 @ 5/16“x5/8” shoulder (12)`
Header to head bolts	`5/16-18 @ 1“ (9x) - - @ 1.5” (3x)`
engine lift bracket to block	`5/16-18 @ 5/8“ (2)`
Intake manifold to head bolts	`5/16-18 @ 1.125” (12)`
EGR to manifolds	`M6x1 @ 25mm (2)`

Intake/Supercharger

Location	Thread Size, Length, and count
Supercharger to LIM	`M8x1.25 @ 40mm (9) - - @ 60mm (1) - - @ 80mm (1)`
SC snout to SC	`M8x1.25 @ 50mm (9)`
Bracket to TB	`M6x1 @ 20mm (2)`
PCV Cover to SC	`M6x1 @ 16mm (2)`
Vac port to SC	`M6x1 @ 20mm (2)`
SC bypass valve to SC	`M6x1 @ 16mm (2)`
Vac Tee to SC	`M8x1.25 @ 20mm (2)`
Fuel rail to SC	`M8x1.25 @ 10mm (1)`
Thermostat cover	`M8x1.25 @ 30mm (2)`

Sensors and Electronics

Location	Thread Size, Length, and count
Sensors to throttle body	`M4x0.7 @ 12mm (2) - - @16mm (4)`
Ignition coil to control module	`M5x0.8 @ 45mm (6)`
Cam sensor bolt	`1/4-20 @ 5/8“ (1)`
MAP sensor	`M5x0.8 @ 30mm (2 or 4)`

Other Accessories

Location	Thread Size, Length, and count
A/C bracket	`3/8-16 @ 2” (1)`
Water pump pulley	`M6x1 @ 12mm (4)`
LIM water cover	`M6x1 @ 20mm (2)`
PCV cover	`M8x1.25 @ 16mm (2)`
Heater hose elbow brackets	`M6x1 @ 16mm (2)`
Evap Sensor bracket	`M6x1 @ 16mm (1)`
EGR heat shield	`M6x1 @ 16mm (1)`
Supercharger tensioner bracket	`3/8-16 @ 1.5“ (1) - - @ 2” (1) - - @ 2.5“ (1)`
Main belt tensioner bracket	`3/8-16 @ 2.5” (3)`
Passenger Side trans bracket	`3/8-16 @ 3/4“ (2)`
Altenator	`M10x1.5 @ 60mm (2)`
A/C compressor to bracket	`M10x1.5 @ 60mm (3)`
Lower SC idler pulley	`M10x1.5 @ 25mm (1)`

Most, if not all of this information has been gathered from Mattstrike's post on PBC