L48 vs. L82
Drifting
Joined: Feb 2005
Posts: 1,738
Likes: 2
From: San diego ca
http://earchitect.50megs.com/corvette/vspecs.html
L-82 heads are large valve heads, not that they flow significantly better for it though...the bottom end of a 78 L-82 is for all intents and purposes the same as the LT-1 of yore...the cam being different and the compression being lower...a stellar starting point for a build up.
all that said, a L-48 will respond to all the mods a L-82 will and you will need to do the same mods to both anyway so starting with a L-48 is just fine.
L-82 heads are large valve heads, not that they flow significantly better for it though...the bottom end of a 78 L-82 is for all intents and purposes the same as the LT-1 of yore...the cam being different and the compression being lower...a stellar starting point for a build up.
all that said, a L-48 will respond to all the mods a L-82 will and you will need to do the same mods to both anyway so starting with a L-48 is just fine.
Pro
Joined: Jul 2005
Posts: 517
Likes: 7
From: Peoria IL
http://earchitect.50megs.com/corvette/vspecs.html
L-82 heads are large valve heads, not that they flow significantly better for it though...the bottom end of a 78 L-82 is for all intents and purposes the same as the LT-1 of yore...the cam being different and the compression being lower...a stellar starting point for a build up.
all that said, a L-48 will respond to all the mods a L-82 will and you will need to do the same mods to both anyway so starting with a L-48 is just fine.
L-82 heads are large valve heads, not that they flow significantly better for it though...the bottom end of a 78 L-82 is for all intents and purposes the same as the LT-1 of yore...the cam being different and the compression being lower...a stellar starting point for a build up.
all that said, a L-48 will respond to all the mods a L-82 will and you will need to do the same mods to both anyway so starting with a L-48 is just fine.
Instructor
Joined: Jan 2007
Posts: 231
Likes: 41
From: Simpsonville SC
Here's a good link that shows the differences between L48 vs. L82.
http://www.vettefinders.com/78Registry/1978spec.html
http://www.vettefinders.com/78Registry/1978spec.html
Drifting
Joined: Feb 2005
Posts: 1,738
Likes: 2
From: San diego ca
Here's a good link that shows the differences between L48 vs. L82.
http://www.vettefinders.com/78Registry/1978spec.html
http://www.vettefinders.com/78Registry/1978spec.html
Instructor
Joined: Dec 2007
Posts: 246
Likes: 2
From: colonia New jeresy
Instructor
Joined: Dec 2004
Posts: 236
Likes: 0
From: Clearwater Florida
Go to NHRA.com.
Click on the Rules tab.
Then click on the Stock Car Classifications tab.
Then click on the Engine Blueprint menu.
They have all the specifications for every production engine made.
The chevy section goes back every year to 1955.
Its an xcel spreadsheet you can download.
Click on the Rules tab.
Then click on the Stock Car Classifications tab.
Then click on the Engine Blueprint menu.
They have all the specifications for every production engine made.
The chevy section goes back every year to 1955.
Its an xcel spreadsheet you can download.
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Pro
Joined: Jul 2005
Posts: 517
Likes: 7
From: Peoria IL
Go to NHRA.com.
Click on the Rules tab.
Then click on the Stock Car Classifications tab.
Then click on the Engine Blueprint menu.
They have all the specifications for every production engine made.
The chevy section goes back every year to 1955.
Its an xcel spreadsheet you can download.
Click on the Rules tab.
Then click on the Stock Car Classifications tab.
Then click on the Engine Blueprint menu.
They have all the specifications for every production engine made.
The chevy section goes back every year to 1955.
Its an xcel spreadsheet you can download.
Doesn't it seem odd that it lists all 350's as 10.2:1 or 10.3:1 compression???
It does give the stock L48 piston "sump" size though- 9.92cc's. I've been looking for that for months!
Racer
Joined: Mar 2007
Posts: 306
Likes: 0
From: New Hampshire
The block casting numbers are the same for L-48 andL-82, Head casting nubers are the same also. L-82 does have different pistons, larger valves, forged crank, 4 bolt mains and better cam but physically, they are the same. As for 2 bolt vs. 4 bolt not that much difference, even Callaway used 2 bolt blocks when he frst started. You can take an L-48, changed cams and you wont even notice the difference. 2.02 valve vs. 1.94 will be marginal on the street. BUT, that siad, I'd get another block and build it up, save the original engine.
