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340 Block Sonic Results ---- What Would You Do? #236419
02/25/09 10:38 PM
02/25/09 10:38 PM
Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms Offline OP
Mr Wizzard
ScottSmith_Harms  Offline OP
Mr Wizzard

Joined: Jan 2003
Posts: 42,714
Spokane Washington
Check out this sonic test on a .040 over 1970 340 block. It could be run without further boring, no ridge or problems, maybe a dingle ball clean up and a finish hone. One cylinder is overly thin, the rest are ok but marginal IMO. Block magged free of cracks and has no problems otherwise.

5053390-Sonic1970340.jpg (184 downloads)
Re: 340 Block Sonic Results ---- What Would You Do? [Re: ScottSmith_Harms] #236420
02/25/09 10:49 PM
02/25/09 10:49 PM
Joined: Jan 2007
Posts: 3,695
nc
E
emarine01 Offline
master
emarine01  Offline
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nc
What stroke are going with , if your going 4" I would do a 1/2 hard fill, Looks like thin spot is on thrust side with stroker crank rod ratio wont favor a thin block , stock stroke has much less side load

Re: 340 Block Sonic Results ---- What Would You Do? [Re: ScottSmith_Harms] #236421
02/25/09 10:54 PM
02/25/09 10:54 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Romeo MI
What do you plan on doing with this block.... you
could sleeve #1.... others are marginal on the thrust
and non thrust.... thin in the fore and aft

Re: 340 Block Sonic Results ---- What Would You Do? [Re: MR_P_BODY] #236422
02/25/09 11:02 PM
02/25/09 11:02 PM
Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms Offline OP
Mr Wizzard
ScottSmith_Harms  Offline OP
Mr Wizzard

Joined: Jan 2003
Posts: 42,714
Spokane Washington
No plans yet, just looking into my options. Not the best block I've seen but it's an original 1970 casting 340 with no other problems so I figure it's worth saving. One sleeve or all 8 (although pricey) would likely be the direction for me.

Re: 340 Block Sonic Results ---- What Would You Do? [Re: MR_P_BODY] #236423
02/25/09 11:04 PM
02/25/09 11:04 PM
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Posts: 970
Farmington Hills, Mich
Chuck@Best_Machine Offline
super stock
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super stock

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Posts: 970
Farmington Hills, Mich
I think #1 already has a sleeve. 4" id .125 wall, - .080 for over bore or .040 per side = .080 sleeve thickness

Re: 340 Block Sonic Results ---- What Would You Do? [Re: Chuck@Best_Machine] #236424
02/25/09 11:27 PM
02/25/09 11:27 PM
Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms Offline OP
Mr Wizzard
ScottSmith_Harms  Offline OP
Mr Wizzard

Joined: Jan 2003
Posts: 42,714
Spokane Washington
No, no sleeves yet Chuck, so says the local machine shop anyway, I'll be sure to have them double check. It's been tanked, magged, and sonic checked so far. I left 4 blocks down there for the same treatment to see what I've got, this is the first one I have a report on.

Re: 340 Block Sonic Results ---- What Would You Do? [Re: ScottSmith_Harms] #236425
02/25/09 11:38 PM
02/25/09 11:38 PM
Joined: Feb 2005
Posts: 5,207
Menomonee Falls
DemonDust Offline
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DemonDust  Offline
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Menomonee Falls
Quote:

No, no sleeves yet Chuck, so says the local machine shop anyway, I'll be sure to have them double check. It's been tanked, magged, and sonic checked so far. I left 4 blocks down there for the same treatment to see what I've got, this is the first one I have a report on.




Wow!!! You're gonna have $4-500 just in testing


SDG Motorsports
Hellcat Demon and Redeye Supercharger CNC Porting
https://www.sdgmotorsports.com/
Re: 340 Block Sonic Results ---- What Would You Do? [Re: DemonDust] #236426
02/25/09 11:50 PM
02/25/09 11:50 PM
Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms Offline OP
Mr Wizzard
ScottSmith_Harms  Offline OP
Mr Wizzard

Joined: Jan 2003
Posts: 42,714
Spokane Washington
Quote:

Wow!!! You're gonna have $4-500 just in testing




And people wonder why a good, magged, good sonic checked bare 340 (or other) block costs so much, and why an untested greasey freshly torn down block that is "seemingly" a great core isn't worth much until it's been checked, your basic catch 22.

Now you know.

Re: 340 Block Sonic Results ---- What Would You Do? [Re: ScottSmith_Harms] #236427
02/25/09 11:58 PM
02/25/09 11:58 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
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Posts: 52,972
Romeo MI
Quote:

Quote:

Wow!!! You're gonna have $4-500 just in testing




And people wonder why a good, magged, good sonic checked bare 340 (or other) block costs so much, and why an untested greasey freshly torn down block that is "seemingly" a great core isn't worth much until it's been checked, your basic catch 22.

Now you know.




Yeah it cost to get them checked... fortunately I
have 3 good 340 blocks plus my R3

Re: 340 Block Sonic Results ---- What Would You Do? [Re: ScottSmith_Harms] #236428
02/26/09 12:04 AM
02/26/09 12:04 AM
Joined: Feb 2005
Posts: 5,207
Menomonee Falls
DemonDust Offline
master
DemonDust  Offline
master

Joined: Feb 2005
Posts: 5,207
Menomonee Falls
Quote:

Quote:

Wow!!! You're gonna have $4-500 just in testing




And people wonder why a good, magged, good sonic checked bare 340 (or other) block costs so much, and why an untested greasey freshly torn down block that is "seemingly" a great core isn't worth much until it's been checked, your basic catch 22.

Now you know.




I know all too well how that goes. I had an R3 block that had the same issues. It was brand new and couldn't handle a 4.100 bore safely. I was pretty upset to say the least. Everyone told me It's a R3 block don't worry about it. Had it checked, it was junk to me


SDG Motorsports
Hellcat Demon and Redeye Supercharger CNC Porting
https://www.sdgmotorsports.com/






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