L48 vs. L82
09-25-2008, 01:42 PM
#22
Drifting
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.
09-25-2008, 01:51 PM
#23
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.
09-25-2008, 04:14 PM
#25
Drifting
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
09-30-2008, 08:42 PM
#27
Instructor
10-01-2008, 08:24 PM
#28
Instructor
Member Since: Dec 2004
Location: Clearwater Florida
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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.
10-01-2008, 09:02 PM
#29
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!
10-04-2008, 07:48 PM
#30
Racer
Member Since: Mar 2007
Location: New Hampshire
Posts: 306
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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.
