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  #1  
Old 01-02-2003, 08:32 PM
71and72F100s
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360 Bored

Hi

I have a 360 bored over .40(currently) which has to bored over .60. What would be the current size and the future size. I mean like some people say they have a 390 bored to a 410. Thanks for the help.


Doug

71 F100 Daily Driver
72 F100 Project
 
  #2  
Old 01-02-2003, 09:28 PM
FrayedSanity
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360 Bored

[updated:LAST EDITED ON 02-Jan-03 AT 10:40 PM (EST)]368, and 371, respectively. (approximations based on stock .017 head gasket and nominal 71cc heads rounded up)

Have a look-see:
http://www.mainstaycomm.net/shady/cubicdisplace/infrm.html
Note: this is generalized, as far as compression ratio is concerned: it doesn't take into account piston dish volume, deck height, etc. The calculator shows my .030 over 390 w/71 cc heads having a 10.14:1 CR, however both my heads and deck were cut. I had to dish the pistons to get it to 9.5:1 with my combo.

Oh, and 390's turn into 410's by stroking them with a 428 crank (3.98 stroke, compared to a 390's 3.78).


F.S.

"Ford Trucks; Eating Bow-ties for Breakfast"

`69 F100 390 4spd 300K+ miles and still rollin'!!

 
  #3  
Old 01-03-2003, 01:07 AM
Scotty1
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360 Bored

> I mean like some people say they have a 390 bored to a
>410. Thanks for the help.


I would like to see the 390 that would bore to 410. If a 390 was bored that far you wouldn't be far from water. The cylinder walls that didn't colapse would surely seep water like crazy. Most 390 blocks are good to go .060 over .100 over is a little hopeful. Most are satisfied with .080 over that will get you to 406, but even that is rare.

I shouldn't pick on you this way, but sometimes that is the best way to learn. I.E. you will never forget now, that the only way to make a 410 out of a 390 is to stroke it with a 410 or 428 crank. Like said, a bore of that magnatude would be more than the poor ole block could handle.

FYI again a 360, 390, and many 410's share the same block. If you get the rotating assembly for a 390 or 427 you can make your 360 a 390. Get Rotating assembly from a 410 OR 428 and make a 410.

Hope I didn't make you mad or anything. Just a little playful ribbing on my part towards you. Hope the info above helps.

Scotty
 
  #4  
Old 01-03-2003, 09:22 AM
William
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360 Bored

Doug, Wait a minute! FE blocks are plentiful, and I do not like overboring past .030. You are already at .040. Consider this, if your pistons are good, get another block and bore it out to .040 and use the pistons you already own. I know these blocks go .060 over with out problems but, why chance it when they are so plentiful. IMHO!
The other thing would be build a 390 short block using a junk yard motor and new pistons.
William in Atlanta
 
  #5  
Old 01-03-2003, 11:41 AM
71and72F100s
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360 Bored

[updated:LAST EDITED ON 03-Jan-03 AT 12:43 PM (EST)]Hi


No I didnt get mad but, now Im worried about water problems. The motor was already bored when I bought it. It is not my choice to have it bored again, but two of the cylinder walls are in bad shape. The machinist suggested that I do this. I guess now Im going to look for a good 390 bare block then use the parts off other motor. So if any knows any good place to find a good 390 block, please email me. Thanks for the help!


Doug
71 Daily Driver
72 Project Truck
 
  #6  
Old 01-03-2003, 12:37 PM
William
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360 Bored

[updated:LAST EDITED ON 03-Jan-03 AT 01:40 PM (EST)]Doug, 390 and 360 are the same block with 4.05 bore. The difference is the stroke 3.5 for the 360 and 3.78 for the 390. pistons rods and crankshaft are not the same and will not mix and match. So, 4.05 block, .040 over if your pistons are good, honed for moly rings, quick resizing on the 360 rods and a grind or polish on the 360 crank. Add gaskets and bearings and you are back in business. Find a 390, get lucky and hone the cylinders for new rings, resize the rods and polish the crank. Add gaskets and bearings and you are back in business. Your heads, and all other components are the same. The 390 CI version of the FE motor is better for trucks and will provide more power. 360 is also good but given a choice and budget being nearly the same go for the 390. I found my latest 390 project in the junk yard for 80 bucks. There is lots more you need to consider so post back.
William in Atlanta
 
  #7  
Old 01-03-2003, 12:42 PM
FrayedSanity
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360 Bored

>Hi
>
>
>No I didnt get mad but, now Im worried about water problems.
>The motor was already bored when I bought it. It is not my
>choice to have it bored again, but two of the cylinder walls
>are in bad shape. The machinist suggested that I do this. I
>guess now Im going to look for a good 390 bare block then
>use the parts off other motor. So if any knows any good
>place to find a good 390 block, please email me. Thanks for
>the help!
>
>
>Doug
>71 Daily Driver
>72 Project Truck

You might consider sonic testing the block. That will tell you how far out it will bore, safely. Depends totally on what you want to do, and how cheaply you want to rebuild.

Even if you go the "new" block route and just rebuild using parts you have, you're still going to need to mag/sonic the new block.(or SHOULD, I'll say)

You'll also still have a 360 (although bored out). You'ld be better off, IMO, in the long run, to look for a 390 shortblock, and spend a little more having the bottom end refreshed. JMO!


F.S.

"Ford Trucks; Eating Bow-ties for Breakfast"

`69 F100 390 4spd 300K+ miles and still rollin'!!

 
  #8  
Old 01-03-2003, 01:55 PM
ford_nut
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360 Bored

Guys
I have a question here. If 360/390 blocks can only go roughly to a .060 overbore, what happens if you are already at the limit? Are these blocks no longer good? IN other words, do they go right to the scrap yard? Surely there has to be a way to revive these hardly blocks. Think about it for a second. If everyone had an FE, eventually they will all end up at .060 overbores. If these blocks cant be salvaged after .060, then there are going to be A LOT of unhappy people looking for new blocks! Unsuccessfully I might add since production ended in '76! Either the rationale regarding reconditioning these blocks is somewhat misleading or Im missing something. Just my .02 worth
regards
Ben
 
  #9  
Old 01-03-2003, 11:56 PM
dinosaurfan
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360 Bored

Ben, after a block has been bored several times and is getting tired, most guys just throw them out. But if you want to save one, any block can be sleeved back to standard bore. Then you can start all over again. DF
 
  #10  
Old 01-04-2003, 02:18 PM
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360 Bored

Ben, yes it's sad but true!

Just think of all those great 427 blocks, they're only good for .030" over.

Barry
 
  #11  
Old 01-04-2003, 06:23 PM
ford_nut
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360 Bored

Barry
cant they be sleeved too??
 
  #12  
Old 01-04-2003, 10:14 PM
William
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360 Bored

Any engine can be sleeved, on one cylinder or on all of them. The deciding factor is cost. On a 427 sleeving all 8 is cheaper than buying a new block. Especially since they are no longer available. The 360/390 were made in the millions and for now its cheaper to get one that is not excessively overbored. I picked up a 390 with rebuildable components for 80 bucks. Cut the crank 10/10, reconditioned the rods and poked it out to 30 over. Next rebuild Ill hone the cylinders and use new rings at 30 over. If I build this engine after that Ill go to 40 over or a different block.
William in Atlanta
 
  #13  
Old 01-05-2003, 12:39 AM
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360 Bored

Yes you can but I wouldn't race it anymore.

I've got a sleeve in my CJ that I'm not too wild about either.

Barry
 
  #14  
Old 01-05-2003, 03:20 AM
Scotty1
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360 Bored

 
 
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