Engine Build Questions

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Apr 5, 2008 | 04:53 PM

frankzappa

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Cruising

Joined: Feb 2008

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Engine Build Questions

some info please.
Im going to replace the short block on my 94. Going to a 383 W forged crank and pistons.
On stock Gm lt-1 are the pistons and cranks forged?

Apr 5, 2008 | 05:24 PM

CFI-EFI

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Joined: Sep 2000

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From: The Top of Utah

After 1985, the pistons are cast not forged. I know that through 1991, the end of the L98s, the cranks were all cast. I don't know about the LTx engines, but I suspect they were cast, also.

RACE ON!!!

Apr 5, 2008 | 05:44 PM

FICINJECTORS

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From: Cumming Ga

Quote:

Originally Posted by frankzappa

some info please.
Im going to replace the short block on my 94. Going to a 383 W forged crank and pistons.
On stock Gm lt-1 are the pistons and cranks forged?

I believe the pistons are HYPEREUTECTIC which has about a 12.5% silicon base in the alloy.. Detonation is a killer.

Apr 5, 2008 | 06:00 PM

CFI-EFI

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Joined: Sep 2000

Posts: 17,298

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From: The Top of Utah

Quote:

Originally Posted by FICINJECTORS

I believe the pistons are HYPEREUTECTIC which has about a 12.5% silicon base in the alloy.. Detonation is a killer.

Correct, but as you note, hypereutectic is the term for an alloy that is super saturated with silicon. It is a term used to describe the metallurgy. It is what they are are made OF, not HOW they are made. The manufacturing process for hypereutectic pistons is they are cast, not forged.

RACE ON!!!

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