400 Project Estimates
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Senior User
Joined: Jan 2005
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400 Project Estimates
For the next truck I get (61-79' 4x4) I will be building a 400. I chose the 400 becasue I already have the block, have great low end torque, and because I want to be different. I was wondering what kind of horsepower and torque numbers I will be running with the following build...
351M Block +.030
-400 Crank & Pistons (408 ci)
-Micropolished crank
-Stock 400 pistons unless I can find some decent aftermarket ones.
-351C 2V Heads
-Ported & polished
-Milled .010
-Mild cam
-Crane 1,500-4,500 rpm range
-204/214 Duration
-.493"/.502" Lift
-High Volume Oil Pump
-Double roller timing chain set
-Edelbrock Performer 400 intake
-650cfm carb
-Headers
351M Block +.030
-400 Crank & Pistons (408 ci)
-Micropolished crank
-Stock 400 pistons unless I can find some decent aftermarket ones.
-351C 2V Heads
-Ported & polished
-Milled .010
-Mild cam
-Crane 1,500-4,500 rpm range
-204/214 Duration
-.493"/.502" Lift
-High Volume Oil Pump
-Double roller timing chain set
-Edelbrock Performer 400 intake
-650cfm carb
-Headers
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
With about 9.0:1 CR, which is about what you will get with flattop pistons you peak torque will be 450 ft-lbs@2500 RPM and the peak HP will be 338 @4500 RPM.
Try TMeyer, Inc for your pistons. You will find a link on the left side of this screen.
Try TMeyer, Inc for your pistons. You will find a link on the left side of this screen.
Elder User
Joined: Jun 2003
Posts: 886
Likes: 1
From: Houston/Hope BC
Danlee can prob tell you more, but the stock cast pistons make 8.7 to 1, which have run fine for me until I pull the boat, then I have to go to premium fuel. This could be my advance but I doubt it.
Dan's numbers sound pretty good, I got 275 at the rear wheel at 4200 (when they stopped the dyno run, the 3.00 rear end was winding it up beyond their safe limit.) on a similar build (less compression, 600cfm, 4v valves into 2v heads.) (estimated auto trans driveline loss of 20% = 343 at the flywheel.)
Reconsider the HV pump, a blueprinted stock pump will give all the oil you need for the life of the engine and not be using power to recycle oil past the relief. GL, I think you'll be happy.
Dan's numbers sound pretty good, I got 275 at the rear wheel at 4200 (when they stopped the dyno run, the 3.00 rear end was winding it up beyond their safe limit.) on a similar build (less compression, 600cfm, 4v valves into 2v heads.) (estimated auto trans driveline loss of 20% = 343 at the flywheel.)
Reconsider the HV pump, a blueprinted stock pump will give all the oil you need for the life of the engine and not be using power to recycle oil past the relief. GL, I think you'll be happy.
