6.4 or 6.7 with an S366?

Jethro · Jun 2, 2014

What would make more power? To even things out the 6.7 has dual fuelers and the 6.4 has 15% nozzles and is holding rail pressure on a 2.2 tune.

Crack85 · Jun 2, 2014

B585Ford · Jun 2, 2014

Crack85 said:
6.4

The 6.7 have nozzles?

Jeff@Spartan · Jun 2, 2014

6.7 will make really good power with dual fuelers and a 66. Not sure on the 6.4. It will make over 600, but I don't know how much.

bigrpowr · Jun 2, 2014

6.7 , and it will spool about 200 rpm earlier with way less smoke.

Crack85 · Jun 2, 2014

bigrpowr said:
6.7 , and it will spool about 200 rpm earlier with way less smoke.

Even with the 6.4 having the 15% nozzles n the 6.7 just having dual pumps?

bigrpowr · Jun 2, 2014

Crack85 said:
Even with the 6.4 having the 15% nozzles n the 6.7 just having dual pumps?

6.7 has already made 685 with a 66 ... ive yet to see a 6.4 do that.

Morgan@Midwest Diesel & Auto · Jun 3, 2014

6.7 stock nozzles still beat a 6.4 @ 15%. I've driven both with cast 66's stock fuel and upgraded. 6.7 will walk it with the right trans tune.

nickg3130 · Jun 3, 2014

Morgan@Midwest Diesel & Auto said:
6.7 stock nozzles still beat a 6.4 @ 15%. I've driven both with cast 66's stock fuel and upgraded. 6.7 will walk it with the right trans tune.

Even a 6.7 without dual pumps? I wouldn't think so..

bigrpowr · Jun 3, 2014

nickg3130 said:
Even a 6.7 without dual pumps? I wouldn't think so..

a 6.7 with a single pump, no chance.

nickg3130 · Jun 3, 2014

bigrpowr said:
a 6.7 with a single pump, no chance.

That's what I figured. What have you made with the 64.5 turbo on ur truck?

bigrpowr · Jun 3, 2014

nickg3130 said:
That's what I figured. What have you made with the 64.5 turbo on ur truck?

600 . but I know the lift and tire combo is knocking about 25-30 out of mine.

Morgan@Midwest Diesel & Auto · Jun 3, 2014

The 64.5 flows a hair less than a cast 66. So your not gonna see any power gains other than it will light quicker and the power come on sooner than a cast 66. The billet 66 spools faster than the cast 66. Not quite as fast as the 64.5 but close and it flows more air than both the other two.