Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 11-22-2011, 02:29 PM   #161
Flathead
Senior Member
 
Flathead's Avatar
 
Join Date: May 2010
Location: Southern Maine
Posts: 1,016
Default Re: Boring a flathead

Interesting to see how many here have sliced up a block for research. I have a sliced up port much like hotcoupe's. Did it with a sawzall and a lot of help taking turns. That was some hard iron.
Flathead is offline   Reply With Quote
Old 11-23-2011, 11:57 PM   #162
tiquer
Senior Member
 
Join Date: Jun 2010
Location: Kamloops B.C.
Posts: 392
Default Re: Boring a flathead

Wow this is priceless info thanks guys but keep it going
tiquer is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 02-17-2012, 02:04 PM   #163
alanwoodieman
Senior Member
 
Join Date: May 2010
Location: upstate SC
Posts: 1,830
Default Re: Boring a flathead

OK tried to read thru to get opions on what limit there is to boring a flatty and got a head ache, Here is my question--have 3 1/16 41 engine with raised intake deck, worn out even further the sleeves. I have a set of 3 3/16 40 over pistons I could use-do you think I will overbore my block to use these pistons. A few years back I had a 40 merc block ( 3 3/16) with large journal crank and it was 40 over and these blocks look the same
alanwoodieman is offline   Reply With Quote
Old 02-17-2012, 02:47 PM   #164
richard crow
Senior Member
 
Join Date: May 2010
Posts: 1,284
Default Re: Boring a flathead

you boar a 32 - 36 21 stud to more than 060 you can always rent it out to heat a 6 story building
richard crow is offline   Reply With Quote
Old 02-17-2012, 03:45 PM   #165
alanwoodieman
Senior Member
 
Join Date: May 2010
Location: upstate SC
Posts: 1,830
Default Re: Boring a flathead

so that info may be good but not relevant to what I am asking
alanwoodieman is offline   Reply With Quote
Old 02-17-2012, 05:24 PM   #166
Ol' Ron
Senior Member
 
Ol' Ron's Avatar
 
Join Date: May 2010
Location: Chester Vt
Posts: 6,642
Default Re: Boring a flathead

No problem boring the 41 block to 3 3/16, after you remove the sleeves that's only another .040" This will however creat a small lip that will prevent the installation of rings I use a special cutter in the boring bar to remove it. OR you can bore to 3 3/15 +.030 ant this will remove the ridge.. OR you can sonic test the block and bore to 3 5/16.
Ol' Ron is offline   Reply With Quote
Old 02-17-2012, 06:10 PM   #167
alanwoodieman
Senior Member
 
Join Date: May 2010
Location: upstate SC
Posts: 1,830
Default Re: Boring a flathead

thanks' Ol' Ron that is what I wanted to know.
alanwoodieman is offline   Reply With Quote
Old 02-17-2012, 06:42 PM   #168
out plowing
Member
 
out plowing's Avatar
 
Join Date: Oct 2011
Location: Waverly, Iowa
Posts: 64
Default Re: Boring a flathead

Not to hijack the thread, but reading all these posts this has left my head spinning. SO! for all you Flathead enthusiasts, I am looking to build a 8BA with 2x2 intake for street use. I plan to clean up the ports from years of carbon build up. My worry is that it is already bored 60 over, I plan to sonic test the walls and bore it out to 80, 100, or 125 over and use a stock Merc crank. I am stumped over what cam to use. I know that everyone has their favorites, but what do you all recommend for a good street use that has a good thump at idle.
out plowing is offline   Reply With Quote
Old 02-17-2012, 07:06 PM   #169
robert dick
Senior Member
 
Join Date: Sep 2010
Location: massachusetts
Posts: 317
Default Re: Boring a flathead

had a 3/ 7/16 x 4 in my 48 conv. bought the engine from New England Speed used -- ex Norwood arena engine--used to drive to Sanford last Sun of the mnth from Arlington Ma, race all day then drive home --often wonder if Walt and i crossed paths back then.
robert dick is offline   Reply With Quote
Old 02-17-2012, 08:14 PM   #170
Walt Dupont--Me.
Senior Member
 
Walt Dupont--Me.'s Avatar
 
Join Date: May 2010
Location: Gardiner Me.
Posts: 4,200
Default Re: Boring a flathead

Quote:
Originally Posted by alanwoodieman View Post
OK tried to read thru to get opions on what limit there is to boring a flatty and got a head ache, Here is my question--have 3 1/16 41 engine with raised intake deck, worn out even further the sleeves. I have a set of 3 3/16 40 over pistons I could use-do you think I will overbore my block to use these pistons. A few years back I had a 40 merc block ( 3 3/16) with large journal crank and it was 40 over and these blocks look the same
Alan, I think 3-3/16 + .040 will work fine on that 41 engine. I've built alot of those engine by removeing the sleeves and boreing out .045 to 3-3/16. I wouildn't be afraid to go another .040 You stick your finger down the water hole next cly and feel the thickness of those blocks, There really thick. Walt
Walt Dupont--Me. is offline   Reply With Quote
Old 02-17-2012, 08:37 PM   #171
joel
Senior Member
 
joel's Avatar
 
Join Date: May 2010
Location: Indiana
Posts: 414
Default Re: Boring a flathead

L 100; aggressive idle and most report good performance. Do a search for L100; there are many threads.
joel is offline   Reply With Quote
Old 02-17-2012, 08:53 PM   #172
denverslim
Senior Member
 
denverslim's Avatar
 
Join Date: May 2010
Location: Ehh...Denver
Posts: 196
Default Re: Boring a flathead

Hey Vergil, with the scarcity of good blocks, these days, do ya think a good welder can fix that sawed up one of yours and getter goin again?...slim
denverslim is offline   Reply With Quote
Old 02-17-2012, 09:27 PM   #173
Vergil
Senior Member
 
Vergil's Avatar
 
Join Date: May 2010
Location: Tehachapi, CA
Posts: 361
Default Re: Boring a flathead

Quote:
Originally Posted by denverslim View Post
Hey Vergil, with the scarcity of good blocks, these days, do ya think a good welder can fix that sawed up one of yours and getter goin again?...slim
hahaha maybe a good welder and a bunch of block filler, I have been looking for another block but as you mentioned they are getting pretty hard to find in my area.


Vergil
__________________
Bigger fonts to aid in reading
Vergil is offline   Reply With Quote
Old 02-17-2012, 09:52 PM   #174
Lawson Cox
Senior Member
 
Lawson Cox's Avatar
 
Join Date: May 2010
Location: Above the gnat line in Georgia
Posts: 5,041
Default Re: Boring a flathead

I have never found anything boring about the flathead. Couldn't resist the pun.
Lawson Cox is offline   Reply With Quote
Old 02-17-2012, 11:15 PM   #175
alanwoodieman
Senior Member
 
Join Date: May 2010
Location: upstate SC
Posts: 1,830
Default Re: Boring a flathead

We are going to do a sonic test, even if I have to purchased a tester. I have been reading on the procedures and it is not really very hard to do. Will keep everyone informed as we build this engine. Thanks Ol Ron
alanwoodieman is offline   Reply With Quote
Old 02-18-2012, 12:00 AM   #176
elwood
Senior Member
 
elwood's Avatar
 
Join Date: May 2010
Location: Dallas
Posts: 866
Default Re: Boring a flathead

wow I just spent 2 hours reading this thread, dont know how Iv missed it.
Damn good reading.
elwood is offline   Reply With Quote
Old 02-18-2012, 01:29 AM   #177
Bassman/NZ
Senior Member
 
Bassman/NZ's Avatar
 
Join Date: May 2010
Location: Napier, New Zealand
Posts: 2,001
Default Re: Boring a flathead

Quote:
Originally Posted by elwood View Post
wow I just spent 2 hours reading this thread, dont know how Iv missed it.
Damn good reading.
Heh heh ..... me too....
Bassman/NZ is offline   Reply With Quote
Old 06-23-2014, 12:19 AM   #178
steve tansy
Junior Member
 
Join Date: Nov 2011
Posts: 5
Default Re: Boring a flathead

i have purchased a set of 3 3/8 pistons the seller says their fore inch stroke they check out 3 3/8,but not sure if they are for my 4 inch crank can you please help my engine has not been tore down yet, is thear any way to measure the pin location to see if they are correct for 4 inch crank they are silvolite pistons does not any nombers on pistons but they check out to 3/8 what do you thank thanks steve
__________________
v8fhtoys
steve tansy is offline   Reply With Quote
Old 06-23-2014, 04:30 AM   #179
Snouts out
Senior Member
 
Join Date: Dec 2013
Location: Covedale,oh
Posts: 226
Default Re: Boring a flathead

If you hot rod e'm,you better know what you're doiing,especially the carbs...!
Snouts out is offline   Reply With Quote
Old 06-23-2014, 08:17 AM   #180
Ol' Ron
Senior Member
 
Ol' Ron's Avatar
 
Join Date: May 2010
Location: Chester Vt
Posts: 6,642
Default Re: Boring a flathead

The quickest way to check stroke of a piston is to compair the wrist pin location to another piston ofknown stroke. The pin is closer to the top of the piston with the longer stroke, by 1/8"
Ol' Ron is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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 Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 10:34 PM.