Are they all the same?
Thread Starter
Racer
Joined: Feb 2005
Posts: 338
Likes: 49
From: Quincy,Illinois
Are they all the same?
Are L98 blocks the same as any other gen1 350 blocks?
I have heard that the iron in the vette blocks is a different alloy than a standard 350 block.
Also are all 87 and newer blocks made for roller cams even if they didn't come with one?
Was wondering if I need to stay with my vette block or if I can use a junkyard piece for a rebuild and have the same thing.
I have heard that the iron in the vette blocks is a different alloy than a standard 350 block.
Also are all 87 and newer blocks made for roller cams even if they didn't come with one?
Was wondering if I need to stay with my vette block or if I can use a junkyard piece for a rebuild and have the same thing.
Le Mans Master
Joined: Mar 2000
Posts: 8,950
Likes: 4
From: Lafayette LA
If you are going to go that route, get a vortec block from a 96-98 C/K Truck / 96-99 GM SUV / 96-02 GM Van.
Safety Car
Joined: Jan 2004
Posts: 3,556
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1 pce seal blocks are machined for the roller hardware whether roller cam was fitted or not
Many truck blocks are 4 bolt mains
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Thread Starter
Racer
Joined: Feb 2005
Posts: 338
Likes: 49
From: Quincy,Illinois
If you are going to go that route, get a vortec block from a 96-98 C/K Truck / 96-99 GM SUV / 96-02 GM Van.[/QUOTE]
Are these blocks 4 bolt? maybe a forged crank or a cast nodular like the l98?
Are these blocks 4 bolt? maybe a forged crank or a cast nodular like the l98?
Drifting
Joined: Aug 2006
Posts: 1,624
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From: Canandaigua New York
Originally Posted by IBVETN2
Are these blocks 4 bolt? maybe a forged crank or a cast nodular like the l98?
A lot of the truck and van engines are 4 bolt but that wouldn't make any difference since your corvette engine isn't.
All L98's are 2 bolt main.
Last edited by Keystring; Sep 26, 2010 at 06:22 PM.
Le Mans Master
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From: WV
WW
Last edited by WW7; Sep 26, 2010 at 06:45 PM.
Le Mans Master
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From: Australia
Last edited by rodj; Sep 26, 2010 at 08:47 PM.
Race Director
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From: Overland Park Kansas
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I considered that an upgrade from the factory 2-bolt block. Both blocks are 638 blocks with the same alloy.
Thread Starter
Racer
Joined: Feb 2005
Posts: 338
Likes: 49
From: Quincy,Illinois
Thread Starter
Racer
Joined: Feb 2005
Posts: 338
Likes: 49
From: Quincy,Illinois
is the 638 the last 3 digits of the casting number? Is there a different casting number for the 4 bolt blocks so you don't have to pull the pan to look?
Le Mans Master
Joined: Aug 2000
Posts: 8,838
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From: Australia
638 is same block casting on my '93 truck block and my '89 L98 .Both 2 bolt . You will find it listed as a early 1 pce seal block ('86 - '94 )
Vortec L31 4 bolt block for my 383 is 880 ; same as used for ZZ4 Crate engine ('96 -'00 )
Vortec L31 4 bolt block for my 383 is 880 ; same as used for ZZ4 Crate engine ('96 -'00 )
Last edited by rodj; Sep 27, 2010 at 12:08 AM.
Race Director
Joined: Nov 2003
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From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
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638 is just what's stamped on the block for 4-bolts and 2-bolt 1-pc RMS. As such, I'd think their metal content would be identical. That's the only reason I mentioned it (referring back to the OP question about alloy).
Thread Starter
Racer
Joined: Feb 2005
Posts: 338
Likes: 49
From: Quincy,Illinois
Does the L31 Vortec either 2 0r 4 bolt mains have powdered metal rods? Not sure what a powdered metal rod is. Are they better than the X rods that are in the L98?
Does the L31 have a better crank than an L98?
Does the L31 have a better crank than an L98?