Chevy Casting Numbers Chevy V8 Casting Numbers Mechanics Forum

Chevy V8 Crankshaft Journal Sizes

Here's a list of Chevy V-8 crankshaft journal sizes. All journal sizes are given in "STANDARD" sizes. Your crankshaft may have been cut down in size previously by a machine shop. Make sure your crank will work in the block you have. Blocks were made for each crank main journal size. If you are putting a "small" or "medium" journal smallblock crank into a "medium" or "large" journal smallblock block you will need crank bearing "spacers" or use special "thick" bearings available from aftermarket suppliers.

Chevy Smallblock V8 Crankshaft Journal Sizes

Gen.I, "Small Journal"

265...Mains-2.30"-Rods-2.00" 283...Mains-2.30"-Rods-2.00" 302...Mains-2.30"-Rods-2.00" 327...Mains-2.30"-Rods-2.00"

Gen.I, "Medium Journal", includes "Vortec" 305 and 350 thru '98 262...Mains-2.45"-Rods-2.10" 267...Mains-2.45"-Rods-2.10" 302...Mains-2.45"-Rods-2.10" 305...Mains-2.45"-Rods-2.10" 307...Mains-2.45"-Rods-2.10" 327...Mains-2.45"-Rods-2.10" 350...Mains-2.45"-Rods-2.10"

Gen.I, "Large Journal" 400...Mains-2.65"-rods-2.10"

Non-production Gen.I combination, using Gen.I 400 crank in Gen.I 350 block 383...400 crank, Mains cut to 2.45"-Rods-2.10"

Non-production Gen.I combination, using Gen.I 350 crank in Gen.I 400 block 377..."Spacer" or "thick" main bearings with 350 crank-Rods-2.10"

Gen.II, "Medium Journal", includes "L-99" 265, "LT-1" 350, "LT-4" 350 265...Mains-2.45"-rods-2.10" 305...Mains-2.45"-Rods-2.10" 350...Mains-2.45"-Rods-2.10"

Non-production Gen.II combination, using Gen.II 265 "L-99" crank in Gen.II 350 block 302...Mains-2.45"-Rods-2.10"

Gen.III, includes '97-2005 "LS-1" Corvette, Firebird, Camaro 345...Mains-2.558"-Rods-2.10"

Corvette "ZR-1", DOHC, "LT-5" 350...Mains-2.76"-Rods-2.10"

Chevy Big Block V8 Crankshaft Journal Sizes


ALL Chevy big blocks used...Mains-2.7488"-2.7495"---Rods-2.20"

Chevy 348-409 "W" Motor V8 Crankshaft Journal Sizes

427 "Z-11"

ALL "W" family motors used...Mains-2.50"-Rods-2.20"

Don't forget to bookmark this page or add it to favorites. We appreciate the support and encouragement we have received from our visitors around the world. If you are running a website, please link to us. And if you find our site helpful, please like us on Facebook!

Chevy V8 Casting Number Locations
Chevy V8 SBC Block and Head Casting Numbers
Chevy V8 BBC Block and Head Casting Numbers
Chevy V8 "W" Motor 348-409 Casting Numbers
Chevy V8 Crankshaft Casting Numbers
Chevy V8 Crankshaft Journal Sizes
Chevy V8 Bore and Stroke List
Chevy V8 Notes
SBC Crate Motors
BBC Crate Motors
SBC Cylinder Heads
Holley Carb Information
Holley Tuning Tips
Chevy engines and parts on eBay
Other links

Got a question? Ask in our Car Mechanic Forums!