sluggish 400
Junior User
Joined: Nov 2002
Posts: 97
Likes: 0
From: Morristown USA
sluggish 400
I have been reading most of the posts here for some time now. I took a lot of information and built a 400. Here are the specs: .040 over, australian heads, Edelbrock Performer intake, dual profile cam, (not sure of the exact duration and lift, but close to what most people recommended here), true roller timing chain set at 0, topped with a Holley 4150. Here's the problem: I've got good pickup from 30-55 MPH, but it bites from take off. I was told the carb was a universal with 60 primary jets and 65 secondary, still have the stock 35 cc pump on it. Timing advancd to 14 BTDC. I've got the basic adjustments on the carb done. How do I get the 35" tires to spin? It's in a 79 F250 4X4 W/C6 and Np203. My first big block, and she sounds sweet running straight pipes...
Elder User
Joined: Oct 2002
Posts: 743
Likes: 1
sluggish 400
Don't know what your gears are but here goes. If you are running less than 4.10 gears you are wasting your time trying to light them up.
First, you need to find some semi-slick pavement. The really porous stuff with lots of rock edges is like sandpaper.
Second make sure that you aren't going to break anything like suspension parts when the tires start hopping.
Third Apply lots of brake and stick your foot in the gas.
Fourth Enjoy.
If this doesn't work go back and check the gears. C-6's are notorious for sucking a lot of power. And if you are still running the stock torque converter, it sucks for this type of thing with big tires. It stalls way too low for lighting up big tires.
First, you need to find some semi-slick pavement. The really porous stuff with lots of rock edges is like sandpaper.
Second make sure that you aren't going to break anything like suspension parts when the tires start hopping.
Third Apply lots of brake and stick your foot in the gas.
Fourth Enjoy.
If this doesn't work go back and check the gears. C-6's are notorious for sucking a lot of power. And if you are still running the stock torque converter, it sucks for this type of thing with big tires. It stalls way too low for lighting up big tires.
