Carb size
Thread Starter
Safety Car
Joined: Jan 2004
Posts: 4,270
Likes: 561
From: Macedonia Ohio
Carb size
Guys,
Has anyone had luck changing carbs on a stock 65 L-79? The stock carb is only 600 and I suspect that is is too small. I am thinking of a 750. Just wondered what everyone who is not sticking with the stock carb is running.
Has anyone had luck changing carbs on a stock 65 L-79? The stock carb is only 600 and I suspect that is is too small. I am thinking of a 750. Just wondered what everyone who is not sticking with the stock carb is running.
Race Director
Joined: Nov 2000
Posts: 10,347
Likes: 673
From: Beverly Hills (Pine Ridge) Florida
Race Director
Joined: Mar 2009
Posts: 19,777
Likes: 4,592
From: Canada's capital
2020 Corvette of the Year Finalist (appearance mods)
C1 of Year Finalist (appearance mods) 2019
I used a holly 750 double pumper with great success, but I had big heads, headers, and Edelbrock to increase flow as well, but it got rid of the vacume secondaries bog.
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Melting Slicks
Joined: May 2007
Posts: 3,461
Likes: 18
From: cooper city florida
You might want to check when your secondaries start opening, and are they fully open at 5500rpm. You might be surprised. I checked mine using the paper clip method, and found out my secondaries didn't start opening until almost 2500 rpm, and at 5500rpm, they were only about 2/3 of the way in. I bought the Holley quick change housing and spring kit, and put in the white spring. What a difference. Now the secondaries start coming in at about 1700rpm, and are fully open at 5500 rpm. My L79 runs great now, and pulls like crazy.
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Thread Starter
Safety Car
Joined: Jan 2004
Posts: 4,270
Likes: 561
From: Macedonia Ohio
Thanks 65 Vette Dude, that is something that I will check. Is everyone saying the 650 in the stock configuration is the way to go, or do you have to tweak it to get the most out of it. I was hoping that this would be the response as I really like the look of the stock carb.
Melting Slicks
Joined: Aug 2001
Posts: 3,006
Likes: 100
From: Phoenix AZ
Thanks 65 Vette Dude, that is something that I will check. Is everyone saying the 650 in the stock configuration is the way to go, or do you have to tweak it to get the most out of it. I was hoping that this would be the response as I really like the look of the stock carb.
http://www.lbfun.com/warehouse/tech_...rb%20Paper.pdf
Le Mans Master
Joined: Oct 2000
Posts: 8,897
Likes: 1,357
From: Santa Ana CA
I run a modified 600 dp with 331 CI and the 327/350 hp cam on a "built" engine and get 293 RWHP @ 5,700 RPM and 293 RWFt-Lb @ 4,600 RPM. Granted that I may give up a couple hp above 5,500 RPM, but a stock L79 won't touch those numbers.
The smaller carb gives better throttle response, especially at lower RPM. How many times do you really exceed 5,500 RPM on the street?
The smaller carb gives better throttle response, especially at lower RPM. How many times do you really exceed 5,500 RPM on the street?
