Slightly off topic...350 Rocket Olds question
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Joined: Oct 2004
Posts: 93
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From: Crossville Tennessee
Slightly off topic...350 Rocket Olds question
Forgive me if this is not a C3 question, but my Corvette is running fine and need a little other info.
I have a 1970 Oldsmobile with original 350 Rocket and 2 bbl carb. I have bought a new Holley Performer intake to go on the car. I also purchased a NIB Holley "450 economaster" carb to mate with this intake. I only want very modest performance but much better mileage. I had a 450 Holley on a Chevy SB once and loved that system. It had lot of pep with secondaries, but cruisability with the standard putting around.
My question is about putting this small of a carb on this motor. Is there any danger of running lean? The carb is originally for a 403 Olds and is marked as such on the factory box, so displacement is not and issue because it is actually going on a smaller engine, albeit higher horsepower.
What might I run into as far as it not running right assuming all parts are new and no installation problems?
I have a 1970 Oldsmobile with original 350 Rocket and 2 bbl carb. I have bought a new Holley Performer intake to go on the car. I also purchased a NIB Holley "450 economaster" carb to mate with this intake. I only want very modest performance but much better mileage. I had a 450 Holley on a Chevy SB once and loved that system. It had lot of pep with secondaries, but cruisability with the standard putting around.
My question is about putting this small of a carb on this motor. Is there any danger of running lean? The carb is originally for a 403 Olds and is marked as such on the factory box, so displacement is not and issue because it is actually going on a smaller engine, albeit higher horsepower.
What might I run into as far as it not running right assuming all parts are new and no installation problems?
Drifting
Joined: Mar 2005
Posts: 1,806
Likes: 3
From: Burlington WI
CFM Calculator
http://www.4secondsflat.com/Carb_CFM_Calculator.html
I entered 350 cid, 5000 rpm, 83% volumetric efficiency and it came up with a required CFM of 420.284
Enjoy!!
Chris B
I entered 350 cid, 5000 rpm, 83% volumetric efficiency and it came up with a required CFM of 420.284
Enjoy!!
Chris B
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Those Economasters run pretty lean. I would not want one on a performance car. It will be fine for cruising, but will run out of steam when you get on it. If you want mileage and performance, how about stock throttle-body fuel injection?
