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Old 11-22-2011, 02:29 PM   #161
Flathead
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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.
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Old 11-23-2011, 11:57 PM   #162
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Wow this is priceless info thanks guys but keep it going
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Old 02-17-2012, 02:04 PM   #163
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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
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Old 02-17-2012, 02:47 PM   #164
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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
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Old 02-17-2012, 03:45 PM   #165
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Default Re: Boring a flathead

so that info may be good but not relevant to what I am asking
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Old 02-17-2012, 05:24 PM   #166
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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.
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Old 02-17-2012, 06:10 PM   #167
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thanks' Ol' Ron that is what I wanted to know.
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Old 02-17-2012, 06:42 PM   #168
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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.
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Old 02-17-2012, 07:06 PM   #169
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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.
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Old 02-17-2012, 08:14 PM   #170
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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
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Old 02-17-2012, 08:37 PM   #171
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Default Re: Boring a flathead

L 100; aggressive idle and most report good performance. Do a search for L100; there are many threads.
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Old 02-17-2012, 08:53 PM   #172
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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
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Old 02-17-2012, 09:27 PM   #173
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Default Re: Boring a flathead

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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.


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Old 02-17-2012, 09:52 PM   #174
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Default Re: Boring a flathead

I have never found anything boring about the flathead. Couldn't resist the pun.
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Old 02-17-2012, 11:15 PM   #175
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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
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Old 02-18-2012, 12:00 AM   #176
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Default Re: Boring a flathead

wow I just spent 2 hours reading this thread, dont know how Iv missed it.
Damn good reading.
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Old 02-18-2012, 01:29 AM   #177
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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....
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Old 06-23-2014, 12:19 AM   #178
steve tansy
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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
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Old 06-23-2014, 04:30 AM   #179
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Default Re: Boring a flathead

If you hot rod e'm,you better know what you're doiing,especially the carbs...!
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Old 06-23-2014, 08:17 AM   #180
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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"
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