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LT4 LT1 and LT4 Comparison

1996 LT4 Topic

Rob

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1990 Corvette ZR-1
L

Louis Bartay

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LT4 and LT1 Comparison

Your spec's on the LT4 crankshaft shows that it is a cast steel crank. I think the LT4 has a FORGED steel crank that is much stronger than the cast poured crank. I will know for sure soon as I plan to replace with a FORGED 383 C.I. crank and rods. Many years ago I has a 1970 LT1 350 that had a FORGED crank( I had it balanced) L.G. Motoer sports in Dallas Tx. is the source of my information on the LT4 crank.
Best Regards, Louis Bartay
1996 LT4 Corvette coupe Tourch red
 

Hutch

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Nov 14, 2000
Messages
58
Location
Orlando, FL, USA
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Two 96 Grand Sports - coupe #633 & convert #707
Don't think so, Louis. The LT4 crank is a nodular iron unit with additional machining, but not forged. The one I chucked in the trash bin after spinning a bearing wasn't, anyway. ;)
 
L

Louis Bartay

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LT4 Crankshaft

Thank's for the information (Hutch). What brand crankshaft did you use in your LT4? Thanks' Louis
 

Hutch

Well-known member
Joined
Nov 14, 2000
Messages
58
Location
Orlando, FL, USA
Corvette
Two 96 Grand Sports - coupe #633 & convert #707
GM supplied me with a crate LT4 replacement under warranty so I'm using a stock (albeit new) crankshaft which really should be good for up to 500HP. The forged units just give you that much more margin of safety.

If I was stroking the engine or putting juice or a blower on it, I'd want a stronger bottom end but otherwise I think the stock crank is up to the task as long as you keep the RPM's at a reasonable level.

-Hutch-
 

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