Hmmm
Thread Starter
Instructor
Joined: Apr 2010
Posts: 185
Likes: 8
From: Gilbert Arizona
Hmmm
Ok boy's I am kinda looking for a new carburetor for my L-46 350-350HP original motor. So would like your opinions. The car is a little beefed up.
It has the Edelbrock Manifold Hi-Rise. Dang, I forgot the cam size!!
It's bored 30over, side pipes.
Thanks guy's
It has the Edelbrock Manifold Hi-Rise. Dang, I forgot the cam size!!
It's bored 30over, side pipes.
Thanks guy's
Le Mans Master
Joined: Feb 1999
Posts: 8,351
Likes: 75
From: Tampa Bay FL
Lars rebuilt/set up the q-jet on my L46 (sold in 2008) along with the points-style distributor. Tuned it perfectly.
Safety Car
Joined: May 2004
Posts: 4,349
Likes: 1,578
From: los altos hills california
Don't go too big! I was happy with a 650 Holley but it did get a little tapped out at the high end. Still I liked it better than the 750 I had on there. I think 700 would have been about right. I now have a 750 ultra which I like a lot but it is on a different motor.
Race Director
Joined: Oct 2005
Posts: 12,468
Likes: 1,548
From: Camp Verde AZ
C1 of Year Finalist (performance mods) 2019
2017 C1 of Year Finalist
650 is plenty big for a 350. Unless you are running at 6000 RPM all the time of the roundy round, stay away from the 750 CFM
I personally like the Holley 6210 spreadbore replacement for the Q-jet, as its small primary help low speed response, but double pump and large secondaries work well during a foot stomp on the throttle.
Doug
I personally like the Holley 6210 spreadbore replacement for the Q-jet, as its small primary help low speed response, but double pump and large secondaries work well during a foot stomp on the throttle.
Doug
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,171
From: Hermosa
Buy this book;
Learn and follow what it says. You will not be disapointed.
The q-jet is capable of 750 CFM. Your 350 can only use maybe 650 CFM if it were a real screamer.
http://www.wallaceracing.com/intakecfm.php
Learn and follow what it says. You will not be disapointed.
The q-jet is capable of 750 CFM. Your 350 can only use maybe 650 CFM if it were a real screamer.
http://www.wallaceracing.com/intakecfm.php
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Safety Car
Joined: Jan 2009
Posts: 4,000
Likes: 299
From: New York
Q-Jets are usually 750 / 795 cfm. If you cammed the motor bored it and now want to change or do carb work , stick with the OEM rated sizes. Forget on line calculators or advice. Facts are facts 750/795 for a sbc 350.
I have a 350 felt dead at 6k , friends said its valve float. Put 1000cfm EZ EFI on and it will pull with no loss of power till it blows up.I had to change governor weights to make sure it shifts at 6300 cause it was pulling right to 7k .
So even though it may run with a 650 , your gonna leave something on the table if and when you do punch it and ask her to give it all up.
And if she is gonna give it up what man don't want her to give it all up .....
I have a 350 felt dead at 6k , friends said its valve float. Put 1000cfm EZ EFI on and it will pull with no loss of power till it blows up.I had to change governor weights to make sure it shifts at 6300 cause it was pulling right to 7k .
So even though it may run with a 650 , your gonna leave something on the table if and when you do punch it and ask her to give it all up.
And if she is gonna give it up what man don't want her to give it all up .....
Safety Car
Joined: Mar 2007
Posts: 3,652
Likes: 49
From: Bridgewater nj
Installed a demon 630 cfm on a Chrysler 400 and it really woke that motor up! I swore I would never buy a Demon again but this new/old design of the thermoquad really works well for the money IMO.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,116
From: Crossville TN
You can't get more horsepower from a "bigger" carb, when the one you have is already "bigger" than you need. Do you have more than 425 hp? If not, your Q-Jet has all the flow you will need.
But, throw your money away, if you want.....
If you still have the original, and unmolested, carb, just buy a good brand of rebuild kit, a new Nitrofil or brass float, a replacement for the fuel filter, and rebuild/set it up in a day.
But, throw your money away, if you want.....
If you still have the original, and unmolested, carb, just buy a good brand of rebuild kit, a new Nitrofil or brass float, a replacement for the fuel filter, and rebuild/set it up in a day.