L82 vs. L48
Le Mans Master
Joined: Mar 2000
Posts: 9,127
Likes: 2,326
From: Pottsville, PA. USA Home Of America's Oldest Brewery Yuengling
Racer
Joined: Mar 2007
Posts: 306
Likes: 0
From: New Hampshire
From what I have, the heads on the L-48 and L-83 are the same casting. 77 is 333882 and the 79's were 462624, so the real difference is forged crank, pistons and cam plus the rear Y-pipe was 2.25 for the L-48 and 2.5" fr the L-82. For engines 30 years old, I'd still go for the L-48. They both suffer from breathing and headers and real duals will help both. Most of the horsepower difference seems to be in the cam and compression ratios. I may be wrong though, regardless, get the best engine.
Melting Slicks
Joined: May 2006
Posts: 3,438
Likes: 41
From: Raleigh NC
St. Jude Donor '13-'14
Yep, I was in the same boat. Thing is, if you're fulfilling your dream as a kid by getting a corvette now, you'll be wishing in 5 more years that you fulfilled your dream to get more power later. Not that the L-82 offers a whole lot more power wise, but if you do end up modifying the block, you'll be much happier with the forged crank and flat top pistons already in the block.
And these days I dont' think price is differing much between a 77 L-48 and L-82.
And these days I dont' think price is differing much between a 77 L-48 and L-82.
Racer
Joined: Feb 2007
Posts: 262
Likes: 2
From: FREDERICKSBURG VA
The L-82 shortblock is the same shortblock used in the 1971/72 LT-1. Put a replacement LT-1 cam, performer RPM intake, & headers, & you have an easy 400hp at 6500rpm. You could do this with an L-48, but the cast pistons/crank won't hold up twisting to 6500rpm.
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Melting Slicks
Joined: Oct 2001
Posts: 2,064
Likes: 1,382
From: Halifax, Nova Scotia, Canada
3896929 L48 Used in 350 CID V-8 Good Torque Street Cam
Open Close Duration Lift
Intake 26° BTC 90° ABC 296° .390"
Exhaust 84° BBC 46° ATC 310° .410"
3896962 L46, L82 Used in Hi-Performance 350
Open Close Duration Lift
Intake 40° BTC 100°ABC 320° .450"
Exhaust 90° BBC 50° ATC 320° .460"
Le Mans Master
Joined: May 2007
Posts: 5,021
Likes: 1,120
From: North tonawanda NY
'Jerry Joe" posted a few fictional facts though.... like the reasons for the .060 gap on his 75 he mentioned in another thread... not sure if someone is feeding him some bad BS or he's making it up?
Last edited by augiedoggy; Jul 13, 2013 at 10:53 PM.
Drifting
Joined: Jul 2002
Posts: 1,944
Likes: 20
From: The only Corvettes in Highett Victoria
I've got L48 engines in my Vettes, and am quite content with their performance. I drive conservatively so would notice little if any difference if I had an L82.
Regards from Down Under.
aussiejohn
Le Mans Master
Joined: May 2007
Posts: 5,021
Likes: 1,120
From: North tonawanda NY
Yeah, but it's the TORQUE that gets the car off the line and as both engines have the same bore and stroke, the torque difference between the two engines is minimal, and therefore the acceleration.
I've got L48 engines in my Vettes, and am quite content with their performance. I drive conservatively so would notice little if any difference if I had an L82.
Regards from Down Under.
aussiejohn
I've got L48 engines in my Vettes, and am quite content with their performance. I drive conservatively so would notice little if any difference if I had an L82.
Regards from Down Under.
aussiejohn
