L82 questions?
Thread Starter
Burning Brakes
Joined: Dec 2002
Posts: 947
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From: Middletown N.Y.
L82 questions?
I've got a friend with a 80 L82 vette. He wants to do upgrades on it. Is there anything special about these motors? I noticed that it has an aluminum intake, supposedly the cam has 222 dur @ .050" which I find rather large for a stock cam. What casting heads do they come with? 230hp for real? Car runs low 16's to high 15's? :confused:
Burning Brakes
Joined: Mar 2001
Posts: 1,211
Likes: 5
From: Nashville TN
Re: L82 questions? (JUAN J SANCHEZ)
From the factory : forged pistons, 2.02 heads, the cam is pretty decent for a factory grind.
These motors respond well to the usual upgrades, exhaust, carb tuning, dist curve adjustment. 14 sec should be easy to obtain with a minimal investment.
These motors respond well to the usual upgrades, exhaust, carb tuning, dist curve adjustment. 14 sec should be easy to obtain with a minimal investment.
Race Director
Joined: Apr 1999
Posts: 15,146
Likes: 477
From: NM
Re: L82 questions? (JUAN J SANCHEZ)
Over the base engine the L82 has the normal hot rod treatment, big valve heads, higher compression, and a wilder cam (same cam that was used on the 69 350ci/350hp engine). One major feature is that the L82 has a much stronger lower end: 4-bot mains, forged crank, and alum. impact extruded pistons.
tom...
tom...
Drifting
Joined: Feb 2002
Posts: 1,987
Likes: 3
From: Manchester, Dead Center in the Middle of TN 25 miles to Jack Daniels,10 miles to Geo Dickle, and .8 mile from the Liquor Store at I-24 Exit 114
St. Jude Donor '05
Re: L82 questions? (JUAN J SANCHEZ)
Sorry, but the 1980 heads are not 202's. BTW I have an extra set for sale if anyone needs them. JIM
Drifting
Joined: Feb 2002
Posts: 1,987
Likes: 3
From: Manchester, Dead Center in the Middle of TN 25 miles to Jack Daniels,10 miles to Geo Dickle, and .8 mile from the Liquor Store at I-24 Exit 114
St. Jude Donor '05
Re: L82 questions? (Tom73)
Tom, Are you sure? I just went out to the shop and measured the valves in my heads and they were 194/150 valves with screw in studs and guide plates and are marked #402624 D/80
GM Parts Manual shows that the '70-'79 uses the #3849814 valve with 350 W/SP. H/PER and the '80 uses #3984180 W/SP. H/PER. I thought '80 was an odd year. Jim
[Modified by PROSOUTH, 8:31 PM 9/23/2003]
GM Parts Manual shows that the '70-'79 uses the #3849814 valve with 350 W/SP. H/PER and the '80 uses #3984180 W/SP. H/PER. I thought '80 was an odd year. Jim
[Modified by PROSOUTH, 8:31 PM 9/23/2003]
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Le Mans Master
Joined: Sep 2000
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From: Westfield Indiana
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Re: L82 questions? (JUAN J SANCHEZ)
I agree with d-man. The biggest restriction is the exhaust. The vettes from 75-82 had very restrictive catalytic converters. Also, having the distributor timing curve changed will increase performance too (biggest bang for buck).
I'm running 14.3 with my 79.
I'm running 14.3 with my 79.
Burning Brakes
Joined: Mar 2001
Posts: 1,211
Likes: 5
From: Nashville TN
Re: L82 questions? (Tom73)
The L46 Motor has higer static compression which gave a bit stronger lower end torque profile than the L-82.
With headers you get a pretty decent lope at idle.
With headers you get a pretty decent lope at idle.
Over the base engine the L82 has the normal hot rod treatment, big valve heads, higher compression, and a wilder cam (same cam that was used on the 69 350ci/350hp engine). One major feature is that the L82 has a much stronger lower end: 4-bot mains, forged crank, and alum. impact extruded pistons.
tom...
tom...
