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Horsepower

CavAir20

Member
Joined
Jul 2, 2001
Messages
21
Location
Austin, TX, USA
Corvette
1974 L-82 White Coupe
I have a pretty much stock 1974 L82 Coupe what is a good way to increase horsepower wihtout loosing a future collectors interest in the car. Money is also a factor. Right now I think I have 250 hp but would prefer to be around 350 or at least 300.
 

Tom Bryant

Well-known member
Administrator
Joined
Nov 9, 2000
Messages
7,265
Location
Edgerton, Ohio, United States
Corvette
1959 black 270hp (9/2/69) 1981 Beige L81(10/20/80)
Cav,

In order to keep it interesting to a collector big changes should be avoided. First I would go to a good free flowing exhaust system. It's easy to put back stock when required. Then a Pertronix elextronic ignition. Fits inside stock distributor for a stock appearance. Recurving of the distributor and tuning the stock carb for max performance will also help. Add a K&N air filter also. The L82 cam and heads are good as is for street performance. If your heads are a little tired you may want to have a good performance 3 angle valve job done with some basic bowl work to unshroud the valves.

I think you will notice some good improvements with these changes. After this you have to start doing thing that show.

Tom
 
7

72 Bluz

Guest
Thanks for asking that question, Cav. I'm wanting to do the same with my 72.

Tom, I guess your advise would apply to me. Would you elaborate on a "free-flowing exhaust"?

Thanks.
72 Bluz
 
R

redmist

Guest
NOS

Cheap thrills, easily installed and removed. Otherwise Tom's advice is the best.
Cold air induction is something else you may want to backyard engineer.
 

Tom Bryant

Well-known member
Administrator
Joined
Nov 9, 2000
Messages
7,265
Location
Edgerton, Ohio, United States
Corvette
1959 black 270hp (9/2/69) 1981 Beige L81(10/20/80)
exhaust

In the case of the L82 it already has 2 1/2" pipes so a good muffler is needed. Something like a Flowmaster or Walker Ultra Flo should free things up to about 15hp and still appear stock. the '72 could have 2" or 1 1/2 " pipes dependind on engine. The 2 1/2 " would make a difference over the 2" but would require matching manifolds, like LT1s on a small block. I have the '62 FI 2 1/2" exhaust manifolds and front pipes with the '59 Off Road system on the '59. Nobody has ever noticed that it isn't stock.

I feel that these improvements will maximize the L82 and used together would definately be felt in the seat of your pants. It would take a trained eye to spot the mods also.

Tom
 

a69vette

Well-known member
Joined
Jun 20, 2001
Messages
264
Location
Valrico, Fl.
Corvette
1969 Triple Black Convertible: 2014 Crys Red Conv
I'll ask the same question for a '69. 350/350 4sp. All numbers matching.
 

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