391FT Build

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Apr 11, 2016 | 03:11 PM

#16

smokenchoken

Fleet Mechanic

Joined: May 2012

Posts: 1,724

Likes: 1

From: peru kansas

Quote:

Originally Posted by WentzMetalWorks

I'm going to have the entire assembly balanced together just to be sure.

That's the best choice that way you know for certain and it will make it so much better than they came from the factory

Apr 12, 2016 | 07:37 AM

#17

krewat

FTE Leadership Emeritus

Joined: Jul 2002

Posts: 42,561

Likes: 422

From: Long Island USA

Quote:

Originally Posted by WentzMetalWorks

I'm going to have the entire assembly balanced together just to be sure.

That's always a good strategy

Give them the clutch pressure plate too ...

Apr 14, 2016 | 08:11 AM

#18

WentzMetalWorks

Thread Starter

Junior User

Joined: Mar 2016

Posts: 69

Likes: 0

From: Fort Wayne

What cam would be best?

Quote:

Originally Posted by Krewat

That's always a good strategy

Give them the clutch pressure plate too ...

Thanks for tip on the pressure plate!

I'm wondering what cam to use in this engine. I'm not too worried about RPM's
as I suspect to hardly ever make it over 5000 rpm. My biggest concern is
torque. The truck will weigh about 12-13000 pounds unloaded and I'm wanting
it to be able to pull a house down if need be. Any suggestions? Also, I'm
running C6TE-G heads, C5AE-C intake, headers, and 9:1 CR.

Apr 14, 2016 | 02:26 PM

#19

smokenchoken

Fleet Mechanic

Joined: May 2012

Posts: 1,724

Likes: 1

From: peru kansas

Lunati 62001 or 62002 if you want a little more RPMs.... just my opinion though unless you want more of an RV cam

Apr 14, 2016 | 07:20 PM

#20

abyars111

Elder User

Joined: Jan 2012

Posts: 896

Likes: 0

From: AL

Call Ken at Oregon Cams and let him help you with a grind. Ken knows FEs very well and has some good grinds for making torque in a work truck.

Jun 12, 2024 | 12:41 PM

#21

Enoch Dahl

2nd Gear

Joined: Jun 2024

Posts: 2

Likes: 0

Looking for a 391 FT intake manifold

Quote:

Originally Posted by decaruby

The venture to make build something useful from a FT is an expensive one. I'm almost done with building my 390, starting with both a 391 and a poorly put together 390.

There really isn't much that can be re-used from the FT motors that is practical, other than the block, pan, oil pickup (not the pump), rods, push rods, rocker shaft assemblies, and valve covers.

The balance issues were what convinced me to leave the FT alone. A 391 crank is externally balanced. You will need to have the crank balanced with the balancer and flywheel / flex plate- and hope that you never need to replace one of the three. The weight of the crank is really significantly more than a FE, designed to keep the heavy momentum going for a low revving motor.

Incidentally, if you really want any 391 stuff, I have too much.

I know it’s been several years, but do you still have 391 FT engine stuff? I’m looking for an intake manifold.

Jun 12, 2024 | 11:46 PM

#22

decaruby

Tuned

Joined: Nov 2009

Posts: 261

Likes: 3

Quote:

Originally Posted by Enoch Dahl

I know it’s been several years, but do you still have 391 FT engine stuff? I’m looking for an intake manifold.

I have some things, but I don't think the intake- I don't recall there being much of a difference and with most iron 8's, exceptionally heavy. It was akin to stock 4BBL.

Jun 13, 2024 | 12:59 AM

#23

Enoch Dahl

2nd Gear

Joined: Jun 2024

Posts: 2

Likes: 0

Quote:

Originally Posted by decaruby

I have some things, but I don't think the intake- I don't recall there being much of a difference and with most iron 8's, exceptionally heavy. It was akin to stock 4BBL.

Thanks for the response. didn’t think there was much difference either, but I guess there is. I think I’ve found a 2 barrel setup in Idaho. If I go with the fitech fuel injection throttle body setup I can use the 2 barrel set up. I talked with fitech and they said it’s good up to 600 H.P. It has a stand alone computer that can govern so the rpm’s won’t get too high and cause other issues.