edelbrock F427 Intake
edelbrock F427 Intake
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From: Louisiana
Edelbrock F427 intake
Hi all. I have a 1973 F100, 360 and C6, that is parked for rebuilding. I've been reading the posts and keep seeing recommendations for the Performer and Performer RPM intake, what is your take on the Edelbrock F427? In order for you to provide good info my tentative plans are as follows; 390 crank and rods, 901 Crane, hedders, DUI dizz, true roller timing set. This will again be a frequent use truck, occasional towing( a Jeep CJ on a car trailer), 2 to 3 times a week I commute, a 200 mile round trip. I have 3 rear end chunks available, 3.00, 3.25, and 3.55 and will be running 31x10.50 tires on 15" wheels. How will the 427F sound for this application using the 4100 autolite carb?
All input welcomed
All input welcomed
Senior User
Joined: Jul 2003
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From: Montana
Intake manifold runner cross section area should be small for better low rpm torque (towing). I tried the Edelbrock performer, worked ok, but the mixture distribution was really poor. Cylinders at the far corners were super rich, and the rest very lean. I'm building a 416 now (390 with 428 crank and 0.030 overbore) and will be putting on a performer rpm. The old F427 is said to be a good manifold, other club members have said good things about them. I was concerned about the tapered runners maybe not having as high an intake runner velocity (better torque) as the rpm. I just finished measuring the rpm intake runner cross section today to match with my cylinder heads. The rpm intake runners have a gradual decrease in area as the runner approaches the cylinder head to increase the flow velocity as the mixture reaches the head. Need to continue the taper on into the head to the choke point. This is all in the direction of torque and horsepower according to Smokey Yunick's book " Power Secrets". Hope this helps.
Freshman User
Joined: Jan 2004
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From: Miami
Should work well for what your are going to use it for. I would use it to see how well it works if you are not satisfied with thout come maybe swap it out later. I would spend the money for a new intake on something to help make the motor last in the begining.
Scotty
Scotty
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From: Louisiana
Been gone a couple of days. Thanks for the responses. Since I already have the F427 intake, I reckon I'll start out with it, and see what happens. At least I can take comfort that no one has said loose the F427(yet).
George
George
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Joined: Aug 2000
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From: SW Michigan
old edelbrock
Jeep, the edel F427 is an excellent manifold. It is, IMO, better than the performer RPM. I would call it second only to the Blue Thunder, I wish Edel still made the F427, but the powers-that-be at Edel want to market the 'new' RPM manifold. Yours is better, enjoy, and consider yourself lucky to have it. DF
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DF, I got to ask. What makes the F427 better than the RPM? I have seen the Mustang, Fairlane, and Cobra guys say the same thing. I find it hard to believe that Edelbrock took a step backward with the RPM but you an several others have said this.
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Senior User
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baddad457, I have several F427 manifolds and have not been dissapointed with the performance and torque on my 73-75 F-250 4x4's. I did look at the performer RPM and noticed that it did not have an exhaust crossover as the F427 has. This may or may not affect cold weather drivablility with the absence of this exhaust crossover, depends on you application and driving climate.
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Joined: Jan 2003
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From: Iowa
That F427 sounds like a winner. Wish I had one. That said, my Performer RPM has been functioning very nicely, so I'm not too put out!
If I may make a suggestion, I would suggest for that cam that you use KB150 pistons (20cc dish) and Mr. Gasket .020" thick steel shim head gaskets. This will give you about 9.1:1 compression, which will be perfect for the 901 cam. The KB150 pistons have a quench area on one side, and when used with the above mentioned head gaskets will provide .030" quench space between the piston and head at TDC. This will make the motor much less prone to pinging, which is good when towing.
Here's some links:
http://www.kb-silvolite.com/performa...tails&P_id=177 --> KB150 pistons
The head gaskets are Summit part number MRG-1132.
Edit: I'd use the 3.55 gears for towing.
If I may make a suggestion, I would suggest for that cam that you use KB150 pistons (20cc dish) and Mr. Gasket .020" thick steel shim head gaskets. This will give you about 9.1:1 compression, which will be perfect for the 901 cam. The KB150 pistons have a quench area on one side, and when used with the above mentioned head gaskets will provide .030" quench space between the piston and head at TDC. This will make the motor much less prone to pinging, which is good when towing.
Here's some links:
http://www.kb-silvolite.com/performa...tails&P_id=177 --> KB150 pistons
The head gaskets are Summit part number MRG-1132.
Edit: I'd use the 3.55 gears for towing.
Last edited by rusty70f100; Dec 16, 2005 at 12:56 PM.
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