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FE Power Forums => FE Technical Forum => Topic started by: 475fetoploader on September 10, 2022, 02:40:02 PM

Title: still playing guess the horsepower?
Post by: 475fetoploader on September 10, 2022, 02:40:02 PM

Hey Folks if we're still playing guess the horsepower, my 4x4 build should be on the dyno in 2 weeks.

428 A scratch .020.  Bore is 4.155  Sonic checked very well. This is the block I put the girddle on.
Scatt 4.250 cast crank
Molnar 6.760 rods
diamond dish pistons.  on paper we're 10.3:1       .005 down the hole
Comp Hydraulic roller    233in  237ex   .614in   .617ex  113   Thanks Brent!  morrel hydro rollers.
Edelbrock performer rpm.  I did some port work, and chamber work myself.  no flow numbers. Stock size valves.
Edelbrock street master. I gasket matched, blended under the carburetor, using an hvh super sucker.  Standard 850 Holley for Dyno
Precision oil pump, stands, shafts, rockers. Comp 3/8 pushrods. 
Milodon 8 qt 4x4 pan. 

Title: Re: still playing guess the horsepower?
Post by: 6667fan on September 10, 2022, 07:35:48 PM

What’s that bore come out to?

Title: Re: still playing guess the horsepower?
Post by: 475fetoploader on September 10, 2022, 09:09:52 PM

4.15

Title: Re: still playing guess the horsepower?
Post by: 1968galaxie on September 10, 2022, 09:15:39 PM

440 HP@ 5700  480 ft-lbs@3900

I will edit my guess. I just noticed it was a 4.25 stroke! That will make a difference.

475 Hp @ 5600 

Title: Re: still playing guess the horsepower?
Post by: My427stang on September 11, 2022, 07:31:48 AM

480 @ 5750 is my guess

Title: Re: still playing guess the horsepower?
Post by: shady on September 11, 2022, 08:50:47 AM

501

Title: Re: still playing guess the horsepower?
Post by: fryedaddy on September 11, 2022, 03:45:56 PM

483hp

Title: Re: still playing guess the horsepower?
Post by: 6667fan on September 11, 2022, 07:08:32 PM

D’oh! Should have typed c.i.

Title: Re: still playing guess the horsepower?
Post by: WerbyFord on September 24, 2022, 01:39:06 PM

Any info on exhaust (headers?) & dyno exhaust system? Or which dyno even?
That stuff can make a difference!

Title: Re: still playing guess the horsepower?
Post by: 475fetoploader on October 04, 2022, 04:42:26 PM

So, I'm having issues uploading pictures. I'll give a quick version of what we did on the dyno today.

I ran 92 pump gas,  its a great pacific northwest day in terms of weather.  Kinda overcast about 77 degrees.  Air is fairly dry. 
The best she did was with a Holley xp 850.  A random dyno carb on Britco's shelf.  (Yes I Bought it when we finished).
I'm kinda surprised peak torque curve was at 34 degrees, nearly no difference down at 32.
The best pull was 534 h.p. at 5,500.  Best torque was at 4,300 at 602 ft lbs. 
I'm super excited about how this turned out.  Better than I was hoping for.  Sounds like a beast, but is mild at an idle still. 
Even when it was warm,  I had 90psi oil pressure at 5,500  30 weight break in oil. 
I'm working on pics, I have 1 short video also. 
Average 564lbs and 492 HP  from 3700 to 5500.  Never turned it past 5700,  Im sure I was running out of cylinder head. 

Title: Re: still playing guess the horsepower?
Post by: 6667fan on October 05, 2022, 08:19:47 AM

Awesome, it sounds like a civilized torque monster. You get to run pump gas and destroy tires. What else will be in truck drivetrain?

Title: Re: still playing guess the horsepower?
Post by: 475fetoploader on October 05, 2022, 09:15:17 AM

NP435, 205 transfer case.  Dana 60 king pin front, Dana 70 rear.

Title: Re: still playing guess the horsepower?
Post by: Stangman on October 05, 2022, 09:30:21 AM

489 HP

Title: Re: still playing guess the horsepower?
Post by: 475fetoploader on October 05, 2022, 01:46:31 PM

ran it yesterday 530/600

Title: Re: still playing guess the horsepower?
Post by: Stangman on October 05, 2022, 07:09:44 PM

sorry i missed that excellent motor you have there.