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Still piling up parts, Offy 6227C and carb are next on the list
Trying to decide which 4v carb to get. I have been buying Edelbrock's for decades since I got very
tired of replacing power valves in my Holley's every week. I have read that in the early 90's they
fixed the issue with a check valve in the newer power valves. Holley or Edelbrock? Size?
Looks like an Edel 1404 500cfm is in my future, Holley is too rich for my blood and parts
are hard to get, as they are low production carb, not to mention made in China. Edel made in USA
Holley parts hard to come by?
It has been years since I have had to buy any Holley parts but they all inter change so cant be all that hard to find.
On the PV if the motor was backfiring to blow them out, the only way I know of on a Holley, your "tune" was off as it should not back fire.
I have run Holley's on a lot of things and never had to change out PV's from back firing.
That 500 CFM might be too big and could hurt how the truck runs.
If not the 390 CFM Holley maybe the 350 CFM v2 of the 2300 carb, they do make a 500 CFM but that will be too big for your motor.
You will need an adapter to go from the carb v2 to intake v4 opening. This is not a big deal as I know someone that uses this adapter with a Sniper 2300 EFI on a 300 six.
Dave ----
Holley parts hard to come by?
It has been years since I have had to buy any Holley parts but they all inter change so cant be all that hard to find.
On the PV if the motor was backfiring to blow them out, the only way I know of on a Holley, your "tune" was off as it should not back fire.
I have run Holley's on a lot of things and never had to change out PV's from back firing.
That 500 CFM might be too big and could hurt how the truck runs.
If not the 390 CFM Holley maybe the 350 CFM v2 of the 2300 carb, they do make a 500 CFM but that will be too big for your motor.
You will need an adapter to go from the carb v2 to intake v4 opening. This is not a big deal as I know someone that uses this adapter with a Sniper 2300 EFI on a 300 six.
Dave ----
Not on the 390 model, no interchange, very low production, I did a ton of reading on the 390 model.
I thought all Holley's used the same jets, power valves, squirters and pumps both 30 & 50 CC.
Heck even the 2300 v2 carb uses the same parts above as I have run both the 350 & 500 CFM 2300 and many different v4 carbs.
So what is different with the 390 that I dont know about? Link being different to what you seen about it ?
Dave ----
That I do not know, but there is a ton of info online stating that fact. Besides, it is almost twice the price of Edel
which are made in America, whereas the Holley is Chinese made. No more Chinese stuff goes in this house if
possible. Summit suggested the 500CFM as their first choice. The swap just got put on the back burner, as
my bumper guard people just came through with a good used deer guard for my truck. I cannot drive to
town without seeing a dead deer on the side of the highway.
I will save all of the info gleaned from all of you, you all have been and will be a great help.
F O T
I will say Holley gets a good penny for their carbs.
The 390 is mostly used on V and straight six motors as the 500 is too big and give poor throttle response.
Dave ----
We have had no problems getting parts to tune a 390 Holley.
The jets and power valves are standard Holley parts as are many of the other Holley 390 parts.
Here is a photo taken this morning in a local Napa Auto parts store that has many Holley carburetor parts including those for the Holley 390.
They had ZERO parts for the Edelbrock carburetors.
Holley manufactures its carburetors in Bowling Green, Kentucky's South Central Kentucky Industrial Park.
The carburetor parts are machined, assembled and the carburetors are tested at that facility.
So far, every Edelbrock carburetor has come jetted rich out of the box for a 300 six.
You have to buy the Edelbrock Calibration kit to try to get the carburetor jetted correctly for idle, cruising and wot which has not been an easy task.
We have one forum member that is trying to jet an AVS2 on a 300 six so he can evaluate "The Carb Cheater" but has not been successful using the parts from the first calibration kit.
The only thing we had to do to get a new Holley 390 jetted correctly was to go up one jet size on the secondary and go down on the Power Valve to improve the fuel mileage during cruising.
Curious what is swaying you toward the 6227C over the 6019DP. The Dual Port is a lot more usable in the normal 300 six‑cylinder RPM range and gives strong low‑end torque, where the C‑series tends to come on around 2,500 RPM. The C‑series also has weaker low‑RPM torque, lazier throttle response, a softer bottom end, and is generally harder to tune for street use because it’s more finicky about getting a solid vacuum signal.
Curious what is swaying you toward the 6227C over the 6019DP. The Dual Port is a lot more usable in the normal 300 six‑cylinder RPM range and gives strong low‑end torque, where the C‑series tends to come on around 2,500 RPM. The C‑series also has weaker low‑RPM torque, lazier throttle response, a softer bottom end, and is generally harder to tune for street use because it’s more finicky about getting a solid vacuum signal.
That is not the experience that many of us have with the "C" intake.
The "C" intake has provided plenty of off idle torque with the stock camshaft as well as many of the moderate performance camshafts.
The "C" does have a problem with fuel distribution to cylinders 5 and 6 due to the divider in the plenum.
We solved that by grinding out the divider in the plenum floor.
The DP caters to cylinders 3 and 4 and leans out cylinders 1 and 6.
The dividers are a restriction to making power.
The DP only allows the carburetor to be mounted sideways.
We have had several forum members start with DPs and eventually replaced then with "C" manifolds.
That's awesome info. I'm just getting into my 300 - at least that is what it is supposed to be but things may change as I learn more. - I'll start a new thread with hopes that you and others will chime in. I'm in learning/discovery mode right now.
That's awesome info. I'm just getting into my 300 - at least that is what it is supposed to be but things may change as I learn more. - I'll start a new thread with hopes that you and others will chime in. I'm in learning/discovery mode right now.