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400 stock redline?

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BreadPlus

400 stock redline?

My truck didn't come with a tach, and I've got this awesome digital dash courtesy of intellitronix, and I've gotta set the max RPM. I know they don't spin super fast but a general number would be neat. Otherwise I'll hook it up and find out myself. I looked on other sites and it can be anywhere from 4000-5500.

'80 F250; currently sitting
'93 F150; extended cab short bed with 4.9/m5od, DD
'86 and '87 Bronco II; offroad toy project
'92 Ranger; race toy project

Gary Lewis

Re: 400 stock redline?

Administrator

You can see the specifications on our page at Documentation/Engines/351M & 400, and then the Specifications tab, then the 400 tab. But, the HP peaks at 3200 RPM, and with a 2bbl carb, retarded cam, and low compression it isn't going to rev very high. So you might set it at 4000 'cause I suspect you are gonna want to shift before then.

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

BreadPlus

Re: 400 stock redline?

Thanks a lot Gary. Now I gotta figure out what motor is in the truck. The vin goes 1F25GPGD1059! The decoder on this site makes it seem like a 351W, another decoder said it was a 302, yet this thing has the telltale marks of a 351m/400, and I'm entirely unsure what it is. I'm gonna pull a plug and stick a 5" long plastic rod in there with marks at 3.5 and 4".

'80 F250; currently sitting
'93 F150; extended cab short bed with 4.9/m5od, DD
'86 and '87 Bronco II; offroad toy project
'92 Ranger; race toy project

mat in tn

Re: 400 stock redline?

there must be some way that you can tell. the 302/351 w engines look quite different from the 400 series. look up some pictures of each . the valve covers should be the simplest way to figure out the type at least.

Gary Lewis

Re: 400 stock redline?

Administrator

In reply to this post by BreadPlus

BreadPlus wrote

The vin goes 1F25GPGD1059! The decoder on this site makes it seem like a 351W, another decoder said it was a 302, yet this thing has the telltale marks of a 351m/400, and I'm entirely unsure what it is.

There's something wrong with your VIN. As shown on the page at Documentation/Specifications/Certification Label a 1980 should have an 11-digit VIN, and an '81 or later should have a 17-digit VIN. But you show 12 digits - assuming the "!" isn't meant to be part of the VIN. So something is wrong.

But if we drop the leading "1" it works, and a 1980 VIN isn't supposed to start with 1:

F25: F250 2wd pickup

G: 351 2bbl, which in 1980 would have been a 351M, and from the outside you can't tell it from a 400

P: Twin Cities manufacturing plant

GD1059: Order of assembly. The 1059th truck off the line from Twin Cities, I think.

Gary, AKA "Gary fellow": Profile

old55pete

Re: 400 stock redline?

In reply to this post by BreadPlus

Is there a coolant bypass hose from the water pump to the thermostat housing? If there is, it is a small block, 302 or a 351 W. That is a starting point

Steve
86 Bronco, XLT, 5.0 EFI, EEC IV, AOD, IFS, limited slip front and rear, 3.08 gears, Tilt steering, factory AC

BreadPlus

Re: 400 stock redline?

PXL_20211030_163948135.jpg
I still don't know how to upload images but here's a straight shot from the front of the engine bay. No Windsor had the coil under the air cleaner like this does, as far as I know.

I was told it was a 400 (and it may be, 40 years and no written history), but judging the fact that it's all equally worn it's a 351m. I'll be setting the redline at 4500 and looking for a set of 2.73 or equivalent rear gears.

'80 F250; currently sitting
'93 F150; extended cab short bed with 4.9/m5od, DD
'86 and '87 Bronco II; offroad toy project
'92 Ranger; race toy project

Gary Lewis

Re: 400 stock redline?

Administrator

Here's your pic. All I did was to copy the url and past it into the blank below "Or copy an image from the internet", making sure to wipe out the "http://" that is already there. But it won't upload 'cause it is over 1MB in size, so I clicked the Big button in Resize.

And it looks like an M-Block to me. The thermostat is in the block and it doesn't look like there's a bypass hose, although it is hard to tell on the latter. Another check is 8 bolts on the valve covers and the fuel pump bolts are oriented vertically on the M-Block.

Gary, AKA "Gary fellow": Profile

Machspeed

Re: 400 stock redline?

Administrator

In reply to this post by BreadPlus

That's no 302/351W. From the valve covers, looks like a 351M or 400.

John

"Blackie" - 1986 F150 4x4 - Mildly warmed over 351W HO - Original owner

old55pete

Re: 400 stock redline?

That is ether a C or an M, Not a windsor

Steve
86 Bronco, XLT, 5.0 EFI, EEC IV, AOD, IFS, limited slip front and rear, 3.08 gears, Tilt steering, factory AC