Hot off the dyno!
Hot off the dyno!
Posting Guru
Joined: Mar 2002
Posts: 2,070
Likes: 2
From: Boise, Idaho
Outstanding. When you get back to us, I'd be curious to hear where the horsepower and torque peaked, what the torque curve looked like, and what cam you used. Oh, and your driving impressions. 
Tuned
Joined: May 2003
Posts: 261
Likes: 4
From: Montana
Great dyno numbers! My '79 400 made 339HP and 460 ft-lb of torque.
Here's the specs and dyno curve:
- '79 400 - rebuilt, honed, balanced rotating assembly, etc.
- Badger .030 flat-top pistons - decked block and milled heads for about 9.2:1 comp ratio
- CompCam XE256 cam
- Edelbrock Performer 400 Intake
- Holley 650cfm carb on a 1 inch spacer
- Taylor wires
- Recurved dizzy
Here are numbers from the best dyno pull (with headers):
RPM lb-Ft HP
2500 415.8 197.9
2600 409.3 202.6
2700 412.9 212.3
2800 421.0 224.4
2900 437.3 241.5
3000 446.0 254.8
3100 452.9 267.3
3200 457.2 278.6
3300 460.7 289.5
3400 458.4 296.8
3500 454.1 302.6
3600 454.9 311.8
3700 447.2 315.0
3800 443.7 321.0
3900 439.0 326.0
4000 430.5 327.9
4100 424.5 331.4
4200 420.2 336.0
4300 414.9 339.7
4400 401.9 336.7
4500 396.1 339.4
4600 383.5 335.9
4700 374.4 335.0
Here's the specs and dyno curve:
- '79 400 - rebuilt, honed, balanced rotating assembly, etc.
- Badger .030 flat-top pistons - decked block and milled heads for about 9.2:1 comp ratio
- CompCam XE256 cam
- Edelbrock Performer 400 Intake
- Holley 650cfm carb on a 1 inch spacer
- Taylor wires
- Recurved dizzy
Here are numbers from the best dyno pull (with headers):
RPM lb-Ft HP
2500 415.8 197.9
2600 409.3 202.6
2700 412.9 212.3
2800 421.0 224.4
2900 437.3 241.5
3000 446.0 254.8
3100 452.9 267.3
3200 457.2 278.6
3300 460.7 289.5
3400 458.4 296.8
3500 454.1 302.6
3600 454.9 311.8
3700 447.2 315.0
3800 443.7 321.0
3900 439.0 326.0
4000 430.5 327.9
4100 424.5 331.4
4200 420.2 336.0
4300 414.9 339.7
4400 401.9 336.7
4500 396.1 339.4
4600 383.5 335.9
4700 374.4 335.0
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
When you guys with dyno numbers get a chance hop on over to the performance forum and answer a question on dyno cost for a user there. Thanks! 
https://www.ford-trucks.com/forums/s...d.php?t=422663
https://www.ford-trucks.com/forums/s...d.php?t=422663
Trending Topics
Freshman User
Joined: Dec 2005
Posts: 34
Likes: 0
From: CENTRAL NEW YORK
i cant find the specs on the xe 256 cam at comp cams.i am building a 400 with the same parts that you have gone with. but i was thingking of the 268h.but i like your numbers and would think about switching to the xe256.could you post the specks?
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