==== 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 @ 45mm'' |

=== 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)'' |
|Fuel rail to Intake|''M6x1 nut (4) and stud'' |
|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)'' |
|Starter solenoid enable nut|M5x0.8 nut|

=== 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 [[http://www.pontiacbonnevilleclub.com/forum/viewtopic.php?f=8&t=44480&view=previous|Mattstrike's post on PBC]]