351 Modified More Hp??????? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 07-16-2006, 09:10 PM
Registered User
 
Join Date: Jul 2006
Location: Pennsylvania
Posts: 2
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
351 Modified More Hp???????

I JUST RECENTLY PURCHASED A FORD RANGER F250. HOW WOULD I GET GET SOME CHEAP HP OUT OF THE 351 MODIFIED

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-16-2006, 09:17 PM
Member
 
Last wiki edit: Ford axle ratio codes
Last journal entry: Rear Suspension
Last photo:
Join Date: Aug 2005
Location: Prattsville
Posts: 6,334
Wiki Edits: 31

Thanks: 2
Thanked 52 Times in 48 Posts
351M's are a variant of the Clevelands some stuff for the clevlands work but there is not much of an aftermarket for the Modefieds. maby an intake manifold and headders, that will net a little. your engine is probably rated at 200 RWHP, putting it at just over 250 or so at the flywheel. don't cam it, they don't help power, in other words, if your engine dosn't have it, they won't give you it, they may restrict an engine that does have it tho.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-16-2006, 10:42 PM
Member
 
Last photo:
Join Date: Oct 2003
Location: Gordonville MO
Age: 67
Posts: 307
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Any Cleveland cam will work, and heads too.

You have basically 2bbl Cleveland open chamber heads,
although with a slightly more restricted exhaust port.

Edelbrock makes Performer intakes for them which does help.

I'm sure a number of the major header makers make headers
for stock truck applications.

The REAL way to more power - especially torque - is to
convert it to a 400. All you need is a 400 crank and pistons.
The rods are the same.

You really need higher compression pistons anyway.

There was an article a number of years ago about a 400 that
just had the stock heads cleaned up, rebuilt w/a good 3 angle
valve job, a Performer intake and I think a 650 Holley, replacement
cast pistons with a little higher compression, and a moderate Crane
hydraulic cam with something like 220 intake duration @ 050,
and even used the stock exhaust manifolds, that made something
like 380 hp and 430+ torque at moderate rpms (flywheel numbers).

Do a search on "Ford 400 engine", there's a surprising amount of info
out there, even some Forums with lots of tech info & performance
hints.

The same basic info applies to your 351m, you'll just have less
torque especially.

For a real budget upgrade, the Performer intake, a garden variety
Holley 600 or 650 cfm vac secondary, a regular hydraulic flat tappet
cam (use the cam kit springs) in the neighborhood of 210 intake
duration @ 050 (check the cam mfg catalogues for usage recommendations), a distributor recurve, and just plain decent ~2-1/4" dual exhaust with free flowing turbo type mufflers like Summit Racing's (or is it Jegs?) for about $15 apiece. All major cam makers make Cleveland hydraulic cams. Don't
overlook Lunati - they have a reputation for big mid range torque in a
cam in that range.

Shop around for used intakes, you can find them occasionally.
If your engine needs any work, clean up the exhaust ports some
if you have the heads off and have a 3 angle valve job done.

If not, just skip that.

Those mods address the biggest choke points on that engine -
the intake & carb, the cam, the ignition curve, and the exhaust.
I think you'd be surprised what those mods would do.

Last edited by macx; 07-16-2006 at 10:50 PM.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 07-16-2006, 10:52 PM
Member
 
Last photo:
Join Date: Aug 2004
Location: Kannapolis,NC
Age: 27
Posts: 155
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The cheapest modification to wake up those motors is a timing set swap. Ford retarded the cam timing of the 335's in '73 by using a different crank gear, simply installing a '70 351C timing set will advance the cam.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 07-17-2006, 01:12 AM
xntrik's Avatar
Save a horse, Ride a Cowboy.
 
Last photo:
Join Date: Jul 2005
Location: Arkansas
Posts: 5,131
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
This was covered extensively about 4 months ago, wish I could find the thread.

It is rated at 150 hp.
You don't need intake, you need cam and exhaust first. The intake won't hinder much below 4500 rpm even with the 2 bbl.

1) timing gear and chain, for '71 timing

2) CompCams XE 252H cam or 4x4 cam, the original cam is lame with .380 lift and 185 duration= low compression mandates short cam with lift up to .475 max. (valve guides won't do more)

3) dist curve

4) Dual exhaust

5) headers

6) then, last, manifold and 600 4bbl., Edel or vac secondary

7) cold air intake, sooner the better.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 07-17-2006, 08:38 PM
Registered User
 
Join Date: Jul 2006
Location: Pennsylvania
Posts: 2
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
DOES ANYBODY KNOW THE A.I.R. PUMP ID NUMBER?
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
351 Modified vs. 351 windsor vs. 351 cleavland ? Blackbob Engine 78 01-27-2013 04:15 AM
the history of chevy v8's savman1 Hotrodders' Lounge 43 03-02-2012 06:57 PM
The ford 351 modified bazerkmerc78 Engine 29 01-20-2011 10:30 AM
550 hp 351 Cleveland? fearsomefairmont Engine 10 01-10-2011 02:09 AM
351 Ho? oldschoolrods Engine 17 03-05-2005 03:48 PM


All times are GMT -6. The time now is 08:27 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.