Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Ford Inline Six, 200, 250, 4.9L / 300
Sign in using an external account
Register Forgot Password?


Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 12-04-2009, 12:22 PM
AJHEATING AJHEATING is offline
Senior User
 
Join Date: Jul 2007
Posts: 105
AJHEATING is starting off with a positive reputation.
How much can you bore a 300?

I was wondering if anybody here has bored a 300 .07 over. the block I have is maybe a .06 over the shop doesnt really no yet. If not I was thinking about just useing .02 over 390 piston. The truck doesnt get driven alot maybe 2500 miles a year at the most. any useful information would help. Thank you
Reply With Quote
  #2  
Old 12-04-2009, 12:32 PM
Harte3 Harte3 is offline
Postmaster
 
Join Date: Dec 2006
Location: Spokane, WA
Posts: 3,200
Harte3 is gaining momentum as a positive member of FTE.Harte3 is gaining momentum as a positive member of FTE.
40 over is safe. 60 over is borderline but doable. Any more than that, probably best to have it sleeved if the block is otherwise usable.
__________________
1983 F150 300 I6, Comp Cam 260h and lifter kit, Port/Polished head, Offy DP Manifold, Holley 4160/1848-1 465 cfm, EFI Exhaust manifolds, Walker Y Pipe to 3-Way Cat, generic Turbo Muffler, Recurved DSII, Mallory HyFire 6a & ACCEL Super Stock Coil, Taylor Spiro Pro Wires, EFI plugs.
"It'll put out what ever it puts out." fordman75
Reply With Quote
  #3  
Old 12-05-2009, 01:49 PM
F-250 restorer's Avatar
F-250 restorer F-250 restorer is offline
Postmaster
 
Join Date: Mar 2008
Posts: 3,997
F-250 restorer has a good reputation on FTE.F-250 restorer has a good reputation on FTE.
X2 what Harte 3 said.

Also, it is always a good idea to set a goal with your engine before you simply start slapping parts together. If you go with a 390 piston, which I have heard of doing with .050 over bore, how much will that bump the compression? Do you want to stay on regular gas? How many hp are you shooting for? Do you want a radical race engine, or one with quite a bit more hp than stock, but still great for long trips and as a daily driver?

Boring a block is done to remove scratches, etc. in the bore. Does it need to be bored? Would it be possible to just hone it? Ask your machinist.

BEFORE YOU PROCEED with any machine work, have the block magnafluxed. A little insurance goes a long way.$

It's just me, but I like to have as much 'meat' in my block as possible. So I don't build over .030.

__________________
http://bit.ly/P2P3ug
http://bit.ly/zpnFTl</a>.<font size=3>

[SIGPIC]
  #4  
Old 12-05-2009, 05:35 PM
flipklos flipklos is offline
Posting Guru
 
Join Date: Sep 2007
Location: Wahpeton ND
Posts: 2,064
flipklos is gaining momentum as a positive member of FTE.
Why punch it 30 when 20 will do? Everyone goes 30 never knew why. Heck I would go 10if they made pistons.
Reply With Quote
  #5  
Old 12-06-2009, 12:24 AM
F-250 restorer's Avatar
F-250 restorer F-250 restorer is offline
Postmaster
 
Join Date: Mar 2008
Posts: 3,997
F-250 restorer has a good reputation on FTE.F-250 restorer has a good reputation on FTE.
Quote:
Originally Posted by flipklos View Post
Why punch it 30 when 20 will do? Everyone goes 30 never knew why. Heck I would go 10if they made pistons.
Hey flip--go to the 73--79 F series forum, and check out my thread entitled, 'disc brake conversion.' There is great conversion available for like $270. A guy posted a link to photos, etc.
__________________
http://bit.ly/P2P3ug
http://bit.ly/zpnFTl</a>.<font size=3>

[SIGPIC]
  #6  
Old 12-06-2009, 12:27 AM
Kuskoal Kuskoal is offline
Elder User
 
Join Date: May 2007
Location: Sparks, NV
Posts: 543
Kuskoal is starting off with a positive reputation.
i think punching .030 over came from the v8 guys, i guess .030 is so popular because the piston bore gets oval on the bent 8, and thats the only way to get them back into perfect circle, i dunno
Reply With Quote
  #7  
Old 12-07-2009, 12:27 AM
9.ford.5's Avatar
9.ford.5 9.ford.5 is offline
Postmaster
 
Join Date: Sep 2008
Location: raymond alberta
Posts: 2,994
9.ford.5 is gaining momentum as a positive member of FTE.9.ford.5 is gaining momentum as a positive member of FTE.
Quote:
Originally Posted by flipklos View Post
Why punch it 30 when 20 will do? Everyone goes 30 never knew why. Heck I would go 10if they made pistons.

pretty sure they do...check on summit


390 pistons from what i have heard create too much compression to continue runnin pump gas...


.060 over is max without sleeving it...but over boring a 300 wont get you much if any thing...why sacrifice the reliabilty for tiny numbers? ... bore it only enough to clean them up and get hypertuectic dished pistons and deck the block and head to create the compression you want...
__________________

"blue bandit" 95 f150 4x4, 300 INLINE SIX!, 5speed, d44 SAS, NP205, 4" lift, 35x13.50 ground hawgs, 4.56's
"clifford II" 07 f350 ext. cab 4x4
05 Pete 379X, 625hp CAT, 18 spd tranny, and loads of shiney!
Reply With Quote
  #8  
Old 12-07-2009, 10:05 AM
AbandonedBronco's Avatar
AbandonedBronco AbandonedBronco is offline
Moderator
 
Join Date: Dec 2007
Location: Boise, Idaho
Posts: 4,871
AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.
Quote:
Originally Posted by 9.ford.5 View Post
.060 over is max without sleeving it...but over boring a 300 wont get you much if any thing...why sacrifice the reliabilty for tiny numbers? ... bore it only enough to clean them up and get hypertuectic dished pistons and deck the block and head to create the compression you want...
Well said. Only bore it over just enough to clean it up. Overboring just to be able to brag you have a 305 I6 isn't worth it.
__________________
1981 Ford Bronco. 300I6 Offenhauser DP Intake Holley 600 4bbl, 31" BFG A/T, NP435, 3.00 rear 9" EFI Manifolds. 2.5" high flow cat/muffler.
1984 Ford Bronco. 300I6 Offenhauser C Intake Holley 600 4bbl, 31" BFG A/T, NP435, 3.55 rear 8.8" EFI Manifolds. 2.5" high flow cat/muffler.
Supermotors Pics
Reply With Quote
  #9  
Old 12-07-2009, 02:21 PM
AJHEATING AJHEATING is offline
Senior User
 
Join Date: Jul 2007
Posts: 105
AJHEATING is starting off with a positive reputation.
The reason I was asking was because one cylinder has a huge scratch done it and the machinist doesnt no if he can get it out at 60 over so I was wondering about 70 over and 390 piston 20 over would be the easiest way. thank you for all the information. I will just have to wait to see what he says.
Reply With Quote
  #10  
Old 12-07-2009, 07:21 PM
F-250 restorer's Avatar
F-250 restorer F-250 restorer is offline
Postmaster
 
Join Date: Mar 2008
Posts: 3,997
F-250 restorer has a good reputation on FTE.F-250 restorer has a good reputation on FTE.
Quote:
Originally Posted by AJHEATING View Post
The reason I was asking was because one cylinder has a huge scratch done it and the machinist doesnt no if he can get it out at 60 over so I was wondering about 70 over and 390 piston 20 over would be the easiest way. thank you for all the information. I will just have to wait to see what he says.

If I were you, I'd pull a short block from the boneyard for about $150 and take THAT block to the machine shop before I'd put all that time and money into trash block. "Why is there never enough $/time to do a job right, but always enough to do it over again?" Find yourself a stock bore block, and go from there. Anyone agree?
Pull the head first, before pulling out an engine at the junkyard, and check the top of the pistons. They will say: .020, .030, .040, .060. If they don't one of those #'s on top, then it is a stock engine.
__________________
http://bit.ly/P2P3ug
http://bit.ly/zpnFTl</a>.<font size=3>

[SIGPIC]
  #11  
Old 12-08-2009, 12:40 AM
9.ford.5's Avatar
9.ford.5 9.ford.5 is offline
Postmaster
 
Join Date: Sep 2008
Location: raymond alberta
Posts: 2,994
9.ford.5 is gaining momentum as a positive member of FTE.9.ford.5 is gaining momentum as a positive member of FTE.
Quote:
Originally Posted by F-250 restorer View Post
If I were you, I'd pull a short block from the boneyard for about $150 and take THAT block to the machine shop before I'd put all that time and money into trash block. "Why is there never enough $/time to do a job right, but always enough to do it over again?" Find yourself a stock bore block, and go from there. Anyone agree? Pull the head first, before pulling out an engine at the junkyard, and check the top of the pistons. They will say: .020, .030, .040, .060. If they don't one of those #'s on top, then it is a stock engine.
X2 ... if the scratch in the block is that bad it isnt worth fixing unless you really wanna sleeve it and by the time you do that it would be cheaper to get a block out of the bone yard...and X2 again on diggin into the engine before you rip ir out, its a lot of work but its better than ripping the whole thing out and paying for it to find out its no better, or even worse than the other one...when browsing through the yard look for truck that already have much of the top half ripped appart, even one that the intake is removed makes that much less work

then you can sell the old block for scrap and make some money back...if i remember correclty the block and pistons weigh in around 390lbs? i think...that should make some coin

i like that quote haha...its very true
__________________

"blue bandit" 95 f150 4x4, 300 INLINE SIX!, 5speed, d44 SAS, NP205, 4" lift, 35x13.50 ground hawgs, 4.56's
"clifford II" 07 f350 ext. cab 4x4
05 Pete 379X, 625hp CAT, 18 spd tranny, and loads of shiney!
Reply With Quote
Old 12-08-2009, 12:40 AM
 
 
 
Reply

Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Ford Inline Six, 200, 250, 4.9L / 300

Tags
040, 200, 300, 302, 49, 60, block, bore, ci, deck, ford, max, pistons, removed, weigh

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump



All times are GMT -5. The time now is 05:32 AM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup