4" crank in a 400 small block

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May 13, 2001 | 08:31 PM

StCr19

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Joined: Dec 2000

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From: Crawfordsville, IN

Car: 1991 Galant VR4

Engine: 2.0L 4G63 Turbo

Transmission: 5sp transaxle/transfer case

4" crank in a 400 small block

Can a stock, production 400 block be machined to accept a 3.875" or 4.000" stroke crankshaft? Also, what is this process called?

May 13, 2001 | 09:55 PM

406 S10 Man

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From: South of GR, MI USA

Car: 1971 Corvette

Engine: 6.0 LS1 L92 heads sheet metal etc.

Transmission: M21 4-speed

Axle/Gears: 3.36

yes. th process is called "get out your grinder". it is a major pita to grind the block for the crank to fit and that is just the beginning. do a search for 4" and you should find a few threads. we discussed this not too long ago.

------------------
88 S10
Dropped 3/4
18" Boyd Coddington Timeless 5s
406 balanced with 6" Eagle H-beam rods, 10.25:1 JE SRP pistons, Comp 284XE cam; 240/246 @.050, .507/.510, Dart 200cc Ironeagle heads, Victor Jr. intake, Holley 750 vac sec.
12.20 @ 115.25 mph