4 bolt L48??????
Drifting
Joined: May 2006
Posts: 1,544
Likes: 0
From: Youngstown Ohio
There are a couple ways to convert 2 bolt to 4 bolt, rumor has it that coversion is stronger than original 4bolt. Someone will have an answer or a thread search will turn up some recent discussions
Pro
Joined: Feb 2004
Posts: 564
Likes: 0
From: Pittsburgh PA
Originally Posted by 73-84 IMSA Widebody
There are a couple ways to convert 2 bolt to 4 bolt, rumor has it that coversion is stronger than original 4bolt. Someone will have an answer or a thread search will turn up some recent discussions
There are a variety of kits to convert a 2-bolt to a 4-bolt main.
The factory 4-bolt setup had the outer and inner bolts running parallel to each other, while many of the conversion kits actually splay the outer bolts, so they're angled away from the inner bolts. From what I understand, the added strength of this one operation is significant (but how much, I don't know).
Retrofitting a seasoned block for this, should make it a pretty stout basis for a high-performance application.
Race Director
Joined: Sep 2002
Posts: 10,362
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From: San Diego - Deep Within The State of CONFUSION!
Originally Posted by pdege
Is it possible to have a 4 bolt main L48? I thought only L82s had 4 bolt mains. A gentleman said he had his L48 rebuilt and they put a 4 bolt main in it. How?
Team Owner
Joined: Feb 2005
Posts: 32,519
Likes: 1
From: central America
St. Jude Donor '08-'09
I think the question here is if you can have a base model vette (L48) and still have a 4 bolt main motor. The answer is yes, though it is rare. A small block is a small block (for the most part) and if you were building so many corvettes and needed a block, then you got whatever you had around (GM is renowned for this). Some L48 cars ended up with 010 blocks (according to the books I've read). When I rebuilt my 72 L48, it had an 014 block, and even some of those had 4 bolt mains in them (though mine did not).
Chances are the guy is not lying. Or he might have had the type of conversion that breathial suggested.
Chances are the guy is not lying. Or he might have had the type of conversion that breathial suggested.
Racer
Joined: Sep 2004
Posts: 482
Likes: 1
From: Brandon Manitoba
I have a 1980 L-48 matching numbers block with 4 bolt mains. It does happen. A forum member said he used to work on the line and if they ran out of 2 bolt blocks for the L-48 they would grab a 4 bolt to keep the line moving. Brent
Race Director
Joined: May 2005
Posts: 10,674
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From: Millington Illinois
St. Jude Donor '08-'09
Originally Posted by bams12
I have a 1980 L-48 matching numbers block with 4 bolt mains. It does happen. A forum member said he used to work on the line and if they ran out of 2 bolt blocks for the L-48 they would grab a 4 bolt to keep the line moving. Brent
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Melting Slicks
Joined: Mar 2006
Posts: 3,342
Likes: 7
From: Connecticut
Originally Posted by Trent Mayo
I just pulled the motor out of my 75 L-48 last weekend to start on my rebuild and was surprised to find that it was a 010 - 4-bolt main too.
Of course I could never be that lucky
So, the L-48 and L-82 were both 010 blocks but there was no external marking that designates 2 or 4 bolt main?
Team Owner
Joined: Feb 2005
Posts: 32,519
Likes: 1
From: central America
St. Jude Donor '08-'09
Originally Posted by Bob Onit
So, the L-48 and L-82 were both 010 blocks but there was no external marking that designates 2 or 4 bolt main?
trw
Melting Slicks
Joined: Mar 2006
Posts: 3,342
Likes: 7
From: Connecticut
Originally Posted by mvftw
I thought that the '010' block meant it had 10% nickel and the '020' blocks (rare) had 20% nickel...or something like that...
http://www.mortec.com/castnum.htm
Team Owner
Joined: Sep 2003
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From: eville in
