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**Gregski** · 07-31-2016, 05:47 PM

Now before I share my AFR readings with you allow me to introduce you to my carburetor as it will be the focal point of these tuning exercises

like most trucks mine originally came with a spread bore Rochester Quadrajet (spread bore meaning the two holes in the front under the carb are smaller than the two holes in the back of the carb) and I must admit the more I learn about carburation the more I respect the design of the Quadrajet (and yes it is probably the most misunderstood and mis configured type a carb out there, ha ha)

anyway I just had to have a Holley so I went out and bought one, a Classic Holley they call it, and at the time I thought all Holley carbs were created equal, well sure some had manual chokes and others had electric, some had vacuum secondaries others had mechanical secondaries, and there were the two barrel and the four barrel, but isn't a Holley carb a Holley carb, well no, more on that later

So I ended up with the 4160 Model - pronounced not as good as the 4150 ha ha

You would think if the 4150 is a good carb than the 4160 must be better, no, that's apparantly not how it works, I think Holley built on the success of the highly tunable 4150 and offered us (common folk aka amateur daily drivers) the "economical" 4160

My Classic Holley Specs
Model: 4160
Part Number: 0-80457SA (S for Shinny, A for Aluminum)
Main Jets: 65
Secondary Metering Plate: Main Hole 0.055, Idle Hole 0.026
Barrels 4
Booster Straight
CFM 600
Choke Electric
Circuit 2
Fuel Inlet Single
Secondaries Vacuum
Throttle Bore 1.563 inch

07-31-2016, 05:47 PM	#28
Gregski Post Whore Join Date: Aug 2014 Location: Sacramento, CA Posts: 10,803	Re: INNOVATE DLG1 Wideband O2 Oxygen Sensor Tuning Diagnostics Logging Air Fuel Ratio Now before I share my AFR readings with you allow me to introduce you to my carburetor as it will be the focal point of these tuning exercises like most trucks mine originally came with a spread bore Rochester Quadrajet (spread bore meaning the two holes in the front under the carb are smaller than the two holes in the back of the carb) and I must admit the more I learn about carburation the more I respect the design of the Quadrajet (and yes it is probably the most misunderstood and mis configured type a carb out there, ha ha) anyway I just had to have a Holley so I went out and bought one, a Classic Holley they call it, and at the time I thought all Holley carbs were created equal, well sure some had manual chokes and others had electric, some had vacuum secondaries others had mechanical secondaries, and there were the two barrel and the four barrel, but isn't a Holley carb a Holley carb, well no, more on that later So I ended up with the 4160 Model - pronounced not as good as the 4150 ha ha You would think if the 4150 is a good carb than the 4160 must be better, no, that's apparantly not how it works, I think Holley built on the success of the highly tunable 4150 and offered us (common folk aka amateur daily drivers) the "economical" 4160 My Classic Holley Specs Model: 4160 Part Number: 0-80457SA (S for Shinny, A for Aluminum) Main Jets: 65 Secondary Metering Plate: Main Hole 0.055, Idle Hole 0.026 Barrels 4 Booster Straight CFM 600 Choke Electric Circuit 2 Fuel Inlet Single Secondaries Vacuum Throttle Bore 1.563 inch Attached Images Last edited by Gregski; 07-31-2016 at 11:02 PM.