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Has anyone successfuly ran any 390 block at 4.125 bore or even at 4.095?

January 11 2018 at 3:29 PM
Bill Ballinger  (Login 65billgal)
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I have a 105 block that was a 360 originally, but no sonic yet. I have a 4.11 bore block that is too thin to build in the corner.

If I did have a good sonic on the 105, what should the specs be to go its best? IE trust, non, thrust, between, etc. And assuming it would yield a decent sonic, I would want to keep it at 4 inch stroke and go light on pistons, what would the maximum tq and hp can it be pushed to? I want to get to 400-420+ ci and use the BBMs to a good use? I am passing this to my son so he he an try it later if he blows up the 394, it is almost 20 yrs since I built it. What are the .040 over 4.25 strokers doing with a stock block?

Ideas?

 
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T
(Login Toivo_)
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4.125 w/ 6.7 rods, .990 pin. Stroked stock crank to 3.90, Cleveland bearing size

January 12 2018, 6:37 AM 

Soniced OK.
Not sure I would recommend it. Seems to run on the warm side.
0 quench.
End of the day lots of custom pieces ordered.

 
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Bill Ballinger
(Login 65billgal)
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I would like .280 thrust, 190 non and .125 everywhere else.

January 12 2018, 8:12 AM 

How was your block at 4.125 bore? Thanks!

 
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Tom P
(Login tomposthuma)
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.280" ?

January 12 2018, 4:13 PM 

Sounds like you are asking for a miracle to get a block with that much wall. I have run a couple .060" over 390's with no problems. Never sonic checked them at all. The one was already running in my 67 Ranchero when I bought it, but loose and burned oil. I drove it for a while and rebuilt it for more power. Discovered then that it was .060" already and got another .040" block that I had bored to use the .060" pistons. It ran cool and got beat on hard whether the walls were .050" thick or .250".

I had that original .060" over block bored to 4.13" to use some standard 428" pistons and it barely took out any metal, it was worn to 4.13" already. Someone used that block with a IU crank from a 410 in a pickup truck for many years. Might still be out there.

 
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Bill Ballinger
(Login 65billgal)
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I have a 105 3 rib block, it doesn't mean a lot. But, I would like to go 4.125

January 12 2018, 5:47 PM 

But, an FE is a lot like a Pontiac bore spa e,etc. If I could get some 4.094 forged pistons, and machine the 3.98 crank I have to 4 inch stroke it would at least be 421 co.

I would rather go to 4.125 x 4 and be at 427 ci with the band. But a 421 would work. I wish I could get some 6.85 rods and 1.32 light forged pistons, but good luck finding a good used set with 1/16 1/16 3/16 rings. It would be a good old school engine. Mondello believed in 1.7 rod ratio for mediocre heads. As a 421 or 427 it would be a sweet engine. 2.1 rod journals and that ratio would be stout. I have some really big roller cams. I'd rather have a smaller 137 firing order hyd roller. Wishing again, but if folks have ends and pieces, I have some trade bait. Caught between the devil and the deep blue sea. Lol.

 
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Bill Ballinger
(Login 65billgal)
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This is my last block

January 13 2018, 8:02 PM 

It's the only 105 block I have with three ribs on the bottom and everything else is just been carried off the junk it's kind of aggravating because I had some that I knew would go out they were you know 428 boars. Sorry about the misspellings I'm dictating this from my smartphone so it seems to be a dumb phone.

 
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Bill Ballinger
(Login 65billgal)
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I have a 105 3 rib block, it doesn't mean a lot. But, I would like to go 4.125

January 12 2018, 5:47 PM 

But, an FE is a lot like a Pontiac bore spa e,etc. If I could get some 4.094 forged pistons, and machine the 3.98 crank I have to 4 inch stroke it would at least be 421 co.

I would rather go to 4.125 x 4 and be at 427 ci with the band. But a 421 would work. I wish I could get some 6.85 rods and 1.32 light forged pistons, but good luck finding a good used set with 1/16 1/16 3/16 rings. It would be a good old school engine. Mondello believed in 1.7 rod ratio for mediocre heads. As a 421 or 427 it would be a sweet engine. 2.1 rod journals and that ratio would be stout. I have some really big roller cams. I'd rather have a smaller 137 firing order hyd roller. Wishing again, but if folks have ends and pieces, I have some trade bait. Caught between the devil and the deep blue sea. Lol.

 
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Bill Ballinger
(Login 65billgal)
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I wonder what would be right on a 4.125 bore for sonic on a105 3 rib block?

January 12 2018, 6:01 PM 


 
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Jeff H.
(Login wsu0702)
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Mirror 105 blocks do not have...

January 12 2018, 8:33 PM 

thicker cylinder walls. The reason that guys think that they are thicker is that Ford improved the core setting process for the MCC plant. So since they have less core shift you can usually bore them out to a larger bore size before getting too thin compared to the DIF blocks.

Like Tom I also raised my eyebrows at the "minimum" .280" wall thickness. The only factory block that could even come close to this is the super rare FT 4.05" block cast with 428 water jacket cores.

 
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Bill Ballinger
(Login 65billgal)
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I meant. 280 on the theust do you think it would be safe to go to 40,000 sober or 44000

January 13 2018, 10:27 AM 

I was just wanting to make something that had a few cubic inches but it doesn't sound like I can. How big would you say aboard that a normal 3 105 390 bore block should take?

 
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Bill Ballinger
(Login 65billgal)
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What did it sonic to? Nm

January 12 2018, 6:04 PM 


 
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DaleP
(Login Posi-67)
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What does it matter? Until you sonic YOUR block this

January 12 2018, 7:14 PM 

is a continuation of a stillborn project. Unless you are willing to buy custom pistons then whatever pistons you can find will determine where to bore the block. Without a sonic, I wouldn't be buying some oddball piston and then hope the block will go big enough. Of course, you already know this.

 
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Bill Ballinger
(Login 65billgal)
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I know I need to have it Sonic so at least I know what I've got but I'd like to if it woul

January 13 2018, 7:43 PM 

If it would go 50 over I'd be satisfied but I've got one right now in the corner that I bored to 60 before I had it sign it and it's so thin that I really can't use it it's got 86 in one spot and most of it's like 120 s and 160 everywhere else so I just really had to put it in the corner so I'm hoping that maybe if this one would go 50 if a person was really careful about it maybe it would go 50 over.

 
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Bill Ballinger
(Login 65billgal)
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I know I just wish you would go 50 over that would really make a difference it's a 1053 ri

January 13 2018, 7:55 PM 

It's a I really wish that it would go out to 50 / anyway it came out of a fresh 360 but it was worn it was really tired 105 3 rib block. Do these blocks generally have enough beef to go 50 over?

 
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T
(Login Toivo_)
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No idea where the handwritten sonic map is. Sorry. Remember a .10 was the thin spot (s).

January 13 2018, 7:44 AM 

Lot of slow idling can raise the temps. On the open road it's fine. May be the radiator or fuel map, maybe not the block. Scary power when I stand on it.

Good luck

 
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Bill Ballinger
(Login 65billgal)
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Thank you kindly I'd like to just go 60 over on my 105 3 ribbed block and if

January 14 2018, 10:43 AM 

Close to 200 on the thrust side and nothing less than 100 anywhere else it seems like it would be alright what do you think? One more detail I forgot to mention is that someone did a drill bit test on my block and they said it was very thick and that it actually probably would go out to a 428 standard.


    
This message has been edited by 65billgal on Jan 14, 2018 10:52 AM


 
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