Trying to find the size of a missing bolt?

I’m in the middle of swapping a B20B into my 1993 civic, and I had to buy (just about) every bolt / nut on the engine and transmission since I was missing so many. I also had the pleasure of tracking down all this information from various forums and sources. To try to help any others who are partaking in a similar project I’ve compiled a list of what I found below. I apologize if there are any errors, these specs are for a B20B with a B18B1 (ls) intake so in theory it should cover most B-Series stuff. It also applies to some D-Series stuff (throttle body, etc).

How to read the info:

  • The number in parenthesis is the quantity.
  • M8, M10, etc are the size of the bolt / washer / nut.
  • The middle number (1.00, 1.25, etc) is the thread pitch.
  • The last number is the length of the bolt.

Intake Manifold


Manifold:

  • (9) M8 x 1.25 x 30mm

MAP Sensor:

  • (2) M4 x 0.70 x 12mm

FITV:

  • (3) M6 x 1.00 x 38mm

Throttle Body:

  • (4) M8 x 1.25 x 25mm
  • (4) M8 Washers

IAT Sensor:

  • (2) M6 x 1.00 x 16mm

Fuel Pressure Regulator

  • (2) M6 x 1.00 x 16mm

Exhaust


Header:

  • (9) M8 x 1.25 x 30mm
  • (9) M8 Washers

Engine Head


Distributor:

  • (3) M8 x 1.25 x 28mm
  • (3) M8 Washers

Engine Block


(2 Bolt) Post Side Mount:

  • (2) M12 x 1.25 Nuts
  • (2) M12 Washers

Transmission


Bell Housing:

  • (5) M12 x 1.25 x 55mm
  • (5) M12 Washers

Starter:

  • (1) M10 x 1.25 x 110mm
  • (1) M10 x 1.25 x 45mm

Rear Bracket:

  • (2) M14 x 1.5 x 67mm
  • (2) M14 Washers

Rear Mount:

  • (3) M10 x 1.25 x 32mm
  • (3) M10 Washers
  • (1) M12 x 1.25 x 97mm

Top Mount:

  • (3) M12 x 1.25 x 20mm

Clutch Slave Cylinder:

  • (2) M8 x 1.25 x 25mm

Speed Sensor:

  • (1) M6 x 1.00 x 30mm

Torque Mount:

  • (3) M12 x 1.25 x 20mm

Ground:

  • (1) M8 x 1.25 x 16mm
My name's Eddie Abbondanzio, and I'm a full time Software Developer. Programming is my favorite hobby, and I love working on anything web related, and my own personal projects. If I'm not programming, then I'm likely working on one of my cars.