redline for 351
More Turbo
Joined: Oct 2004
Posts: 621
Likes: 2
From: Marana, AZ
The Ford F-250 with 5.8L in 1991 is as follows:
<TABLE cols=5 width="100%" border=1><TBODY><TR><TD><CENTER>1991</CENTER></TD><TD><CENTER>5.8W (351 ci)</CENTER></TD><TD><CENTER>210 hp @ 3800 rpm</CENTER></TD><TD><CENTER>315 ft/lb @ 2800 rpm</CENTER></TD></TR></TBODY></TABLE>
But if your still gaining power at a higher RPM, then go for it. But like MustangGT said, 4-5k should be the max.
<TABLE cols=5 width="100%" border=1><TBODY><TR><TD><CENTER>1991</CENTER></TD><TD><CENTER>5.8W (351 ci)</CENTER></TD><TD><CENTER>210 hp @ 3800 rpm</CENTER></TD><TD><CENTER>315 ft/lb @ 2800 rpm</CENTER></TD></TR></TBODY></TABLE>
But if your still gaining power at a higher RPM, then go for it. But like MustangGT said, 4-5k should be the max.
Thread Starter
|
Senior User
Joined: Jul 2003
Posts: 234
Likes: 0
From: St Croix Falls,WI
thanks desertdave35, i didnt know the hp and torque for my motor, though i have a question. I bnought the truck about 2 years ago, and the guy i bought it from rebuild it cause i think it started to ping, he ended up boring it out i think 30 or 40 over. what kind of gains would i get from this is any.
Trending Topics
Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
Boring an engine is not done for a performance thing necessarily. They don't bore the cylinder to make it larger for more power...they bore it to clean up the cylinder walls, and they will put new rings on it, to restore the engine's compression. The compression declines over an engines life, causing a slow decline in power, and eventually it'll burn oil etc etc...
So they bored your motor 30 or 40 over, which is common (my 393 is 30 over, written .030). It'll make your 351 like a 357ish ci (I guessed, didn't do the math), and it'll effectively restore it to like-new condition. Boring an engine does increase it's size, but barely, and having a larger motor does make more power but its so minimal that...its not considered. It's more of just rebuilding the engine to make it like new. Think of boring as a repowering instead of an increase in performance/power. If you do nothing but bore the engine, it'll just re-store compression which will bump the power up to original specs (in theory).
So they bored your motor 30 or 40 over, which is common (my 393 is 30 over, written .030). It'll make your 351 like a 357ish ci (I guessed, didn't do the math), and it'll effectively restore it to like-new condition. Boring an engine does increase it's size, but barely, and having a larger motor does make more power but its so minimal that...its not considered. It's more of just rebuilding the engine to make it like new. Think of boring as a repowering instead of an increase in performance/power. If you do nothing but bore the engine, it'll just re-store compression which will bump the power up to original specs (in theory).
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Senior User
Joined: Dec 2002
Posts: 385
Likes: 0
From: airdrie canada
351
Originally Posted by MustangGT221
Boring an engine is not done for a performance thing necessarily. They don't bore the cylinder to make it larger for more power...they bore it to clean up the cylinder walls, and they will put new rings on it, to restore the engine's compression. The compression declines over an engines life, causing a slow decline in power, and eventually it'll burn oil etc etc...
So they bored your motor 30 or 40 over, which is common (my 393 is 30 over, written .030). It'll make your 351 like a 357ish ci (I guessed, didn't do the math), and it'll effectively restore it to like-new condition. Boring an engine does increase it's size, but barely, and having a larger motor does make more power but its so minimal that...its not considered. It's more of just rebuilding the engine to make it like new. Think of boring as a repowering instead of an increase in performance/power. If you do nothing but bore the engine, it'll just re-store compression which will bump the power up to original specs (in theory).
So they bored your motor 30 or 40 over, which is common (my 393 is 30 over, written .030). It'll make your 351 like a 357ish ci (I guessed, didn't do the math), and it'll effectively restore it to like-new condition. Boring an engine does increase it's size, but barely, and having a larger motor does make more power but its so minimal that...its not considered. It's more of just rebuilding the engine to make it like new. Think of boring as a repowering instead of an increase in performance/power. If you do nothing but bore the engine, it'll just re-store compression which will bump the power up to original specs (in theory).
Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
Depends on what type of 351 you're refering to, used...new...but it's pretty vague to be able to tell you.
150psi is considered good for a used engine, I believe new engines are around 200+...the compression ratio, type of rings, their condition...as well as many other aspects can affect the compression.
150psi is considered good for a used engine, I believe new engines are around 200+...the compression ratio, type of rings, their condition...as well as many other aspects can affect the compression.
Senior User
Joined: Dec 2002
Posts: 385
Likes: 0
From: airdrie canada
351 Specs
THANKS FOR REPLY, SOUNDS LIKE I HAVE A VERY CRAPPY 351W, AFTER REBUILD, I HAVE 137.5 LBS IN ALL CYLINDERS! SO MANY THINGS HAVE GONE WRONG WITH THIS REBUILD, STARTING WITH THE MACHINE SHOP SCREWING UP THE WRIST PINS. 
Senior User
Joined: Dec 2002
Posts: 385
Likes: 0
From: airdrie canada
351 redline
Originally Posted by darkknight9
The lowest cyl compression should be no less than 75% of the highest one.
Elder User
Joined: Nov 2004
Posts: 726
Likes: 0
From: So. California
I have a 1983 f-150 with a 351 windsor dual exaust with 3 speed auto and 4.11 gears 4x2. It will about knock me ito the seat up to 3500 rpm and anything 3700+ there is no power and you stop moving. It has a Holly 2 barrel Identical to the one on my 1968 stock 302/289. A 500 cfm should feed a stock 351 up to 5000 rpm, so either the carb is a 350 holley or the cam is very small.56000 mi on the odometer with a rebuilt engine, I have no idea how many miles are on the truck or moter because it is so simple to change the odometer reading.