Increase Font Size Option 6 Reset Font Size Option 6 Decrease Font Size Option 6
Home 49-54 Data General Chevy Data

Chevy Crankshaft Journal Sizes

Chevy V-8 Crankshaft Journal Sizes

There is a lot of misinformation on the internet about these numbers. We have taken the time to verify the data as much as possible. There still may be errors. Please lets us know if you find one.

Journal sizes are factory standard sizes. Your crankshaft journals may have been previously cut down by a machine shop. Make sure the crank you have is matched to your block. Blocks were made with specific journal sizes. Putting a small or medium journal, small-block crank into a medium or large journal, small-block block requires crank bearing spacers or special thick, aftermarket bearings

Chevy Small Block Journal Sizes

Gen. I, Small Journal

C.I.D. Main Rod
265 2.30 2.00
283 2.30 2.00
302 2.30 2.00
327 2.30 2.00

Gen. I, Medium Journal (Includes Vortec 305,350 to 1998.)

C.I.D. Main Rod
262 2.45 2.10
267 2.45 2.10
302 2.45 2.10
305 2.45 2.10
307 2.45 2.10
327 2.45 2.10
350 2.45 2.10

Gen. I, Large Journal

C.I.D. Main Rod
400 2.65 2.10

383, Gen. I, Non-Factory

Gen. I, 400 Crank in a Gen. I, 350 Block. Crank mains cut down.

C.I.D. Main Rod
383 2.45 2.10

377, Gen. I, Non-Factory

Gen. I, 350 Crank in a Gen. I, 400 Block. Spacer or Thick mains bearings.

C.I.D. Main Rod
377 2.10

Gen. II, Medium Journal

Includes: L99 265, LT1 350, LT4 350

C.I.D. Main Rod
265 2.45 2.10
305 2.45 2.10
350 2.45 2.10

302, Gen. II, Non-Factory

Gen. II, 265 L99 Crank in a Gen. II, 350 Block.

C.I.D. Main Rod
302 2.45 2.10

Gen. III

Includes: 1979-05 LS1 Corvette, Firebird, Camaro.

C.I.D. Main Rod
345 2.558 2.10

Corvette ZR1, LT5, DOHC.

Gen. II, 265 L99 Crank in a Gen. II, 350 Block.

C.I.D. Main Rod
350 2.76 2.10

Chevy Big Block Journal Sizes

T = Tall Deck

C.I.D. Main Rod
366T,396,402,427,427T,454,502 2.7488-2.7495 2.20

Chevy 348-409 W Journal Sizes

C.I.D. Main Rod
348,409,427 Z11 2.50 2.20
User Login

FREE Membership



Cruise with us.

Search
Online
We have 17 guests and 1 member online