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Which is better? 4340 or 5140

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Old 12-10-2002, 08:33 PM
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Car: 83 Z-28
Engine: 406
Transmission: TH350
Axle/Gears: 3.70
Which is better? 4340 or 5140
Which is the better metal for a crank? 4340 or 5140
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Old 12-10-2002, 08:41 PM
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Car: 89rs
Engine: 400Sb
Transmission: Tremec 3550
4340 steel is the best
everything else is less than perfect. 4130s then 5140 is the quality of steel.
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Old 12-10-2002, 08:45 PM
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Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
4340 is the best.

Both are a Chrome Moly steel.
4340 is lighter
5140 has better corrosion resistance

http://www.scatcrankshafts.com/newslawone02.html
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Old 12-10-2002, 10:02 PM
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Car: 83 Z-28
Engine: 406
Transmission: TH350
Axle/Gears: 3.70
Thanks guys. Great link Stephen 87 IROC! Very informative.
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Old 12-10-2002, 10:37 PM
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Car: 83 Z-28
Engine: 406
Transmission: TH350
Axle/Gears: 3.70
O.K. I have another question. How much power can a nodular iron crank handle?
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Old 12-10-2002, 11:05 PM
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Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
I'm assuming this is in a SBC.

A stock cast crank can easily take over 550 HP. There are a few prepped stock cranks that reach 700 hp. A nodular crank is stronger and can survive most buildups.

I've run a stock cast crank in my engine for the last few years. I just upgraded to a 4340 crank to reduce some weight.
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