Header Dyno Comparison!

[Wheeler]

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383,9-7-1, vortec heads, sniper efi

1 1/2” JBA Shorty, no H pipe, 3.73 gears & 285/75/16 rubber made..

250rwhp
322rwtq
@3800rpm

1 5/8 JBA Long Tubes, H pipe, 4.56 gears & 295/70/17 rubber made..

255rwhp
330rwtq
@3500rpm

Considering Edle Brock E-Tek heads... 3k installed. (Keep in mind I live in Canada!)

 

[TheAutumnWind]

Gearing and tires changed too. Not exactly an apples to apples comparison.

 

[Wheeler]

Gearing and tires changed too. Not exactly an apples to apples comparison.

You went with a shorter tires and more gear?

I went from the 3.73, 285s & shorties to 4.56, 295s & long tubes

video is the long tubes..

 

[Brian sharp]

Sorry if this is off topic but do you think having a 383 is worth the machine shop time? Debating on stroking my 350 but I’m torn.

 

[Supercharged111]

The deeper gears are supposed to hurt your numbers so he gained power no matter how you slice it.

 

[Wheeler]

Sorry if this is off topic but do you think having a 383 is worth the machine shop time? Debating on stroking my 350 but I’m torn.

All depends what u want out of it. I paid a shop $5600 to build mine including the intake manifold. I love it, but still crave more power!

 

[TheAutumnWind]

I went from the 3.73, 285s & shorties to 4.56, 295s & long tubes

video is the long tubes..

Looks like a heavier tire and more gear, so likely gained more power from the longtubes than the numbers alone show.

 

[TheAutumnWind]

Sorry if this is off topic but do you think having a 383 is worth the machine shop time? Debating on stroking my 350 but I’m torn.

If its getting rebuilt anyways then why not?

 

[Brian sharp]

True true true

 

[L31MaxExpress]

Cam must be small. I made 272 rwhp and 330 rwtq on E85 through a 4L85E and 9.5" 10-bolt with a stock 350 bottom end at 9.6:1, 906s milled 0.020", cut for 2.02/1.60s and 1.7 rockers on the little 196/206 marine cam. Thorley tri-y headers and the GM L31 crossram marine intake.