Re: Bad Block News Today
[Re: HDNMOPERS]
#2620937
02/13/19 08:36 PM
02/13/19 08:36 PM
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Joined: Aug 2003
Posts: 43,285 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,285
Bend,OR USA
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How bad is bad on the sonic tests?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Bad Block News Today
[Re: Cab_Burge]
#2620940
02/13/19 08:44 PM
02/13/19 08:44 PM
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Joined: Jun 2015
Posts: 150 It's Complicated
HDNMOPERS
OP
member
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OP
member
Joined: Jun 2015
Posts: 150
It's Complicated
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The block was standard bore with 3-4 cylinders in the 70 range. Which Matt said was as bad has he as seen. Not seen the sonic sheet myself. But I will take his word for it. And that was. He would not use it for this build. For a stock rebuild job maybe. For a stroker no dice.
Last edited by HDNMOPERS; 02/13/19 08:56 PM.
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Re: Bad Block News Today
[Re: HDNMOPERS]
#2620941
02/13/19 08:44 PM
02/13/19 08:44 PM
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Joined: Jan 2003
Posts: 10,016 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,016
Frostbitefalls MN (Rocky&Bullw...
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If you can come up with a good block that only needs one or two sleeves to fix, I would go for it. There is no way a gen 3 will match the power per $$ considering you will take a bath on what you have, plus you will have to buy gen 3 stuff. Keep looking for a good 400, with the loss on your current parts in mind!
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Bad Block News Today
[Re: gregsdart]
#2620945
02/13/19 08:54 PM
02/13/19 08:54 PM
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Joined: Jun 2015
Posts: 150 It's Complicated
HDNMOPERS
OP
member
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OP
member
Joined: Jun 2015
Posts: 150
It's Complicated
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Yeah I know and agree. Just bummed. Was gonna have this engine rollin together. Then I get this news. Like I said I have another block and a line on 2 more. Will see. Very frustrating though. Oh and until I get a block thats good. You go to the end of the line.
Last edited by HDNMOPERS; 02/13/19 09:00 PM.
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Re: Bad Block News Today
[Re: HDNMOPERS]
#2620958
02/13/19 09:20 PM
02/13/19 09:20 PM
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Joined: Aug 2003
Posts: 43,285 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,285
Bend,OR USA
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The block was standard bore with 3-4 cylinders in the 70 range. Which Matt said was as bad has he as seen. Not seen the sonic sheet myself. But I will take his word for it. And that was he would not use it for this build. For a stock rebuild job maybe. For a stroker no dice. If he is saying that you have .070 thick now I would junk that rascal also I had one of the first 400 block I built ended up having .030 after boring it on the cam shaft side of the block on all four cylinders on the driver side , it split the # 1 cylinder on the dyno I bought a Dakota 1000 sonic tester after that and I use .160 minimum on the thrust sides and .130 on the non thrust sides as a minimum before boring
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Bad Block News Today
[Re: HDNMOPERS]
#2620965
02/13/19 09:30 PM
02/13/19 09:30 PM
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Joined: Jan 2008
Posts: 4,255 Canada
WO23Coronet
master
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master
Joined: Jan 2008
Posts: 4,255
Canada
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Yeah I'd say keep your chin up and keep looking for a 400 block, especially with the point that you're at and all the good parts you have
Last edited by WO23Coronet; 02/13/19 09:30 PM.
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Re: Bad Block News Today
[Re: HDNMOPERS]
#2621006
02/13/19 10:38 PM
02/13/19 10:38 PM
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Joined: Jan 2003
Posts: 5,122 Chicago Blackhawks
hemicar1971
master
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master
Joined: Jan 2003
Posts: 5,122
Chicago Blackhawks
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Was there or is there a year that is a better block than other years without said problem. I have a 400 motor also and think it was cast in 71 or maybe it came out of a 1972 Vehicle. Just hanging on to it in case I ever make a stoker out of it but likely will never happen. Has anyone done a study on what 400 block are better than others, year, mold it came from stuff like that.
1971 HEMI E BODY REGISTRY
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Re: Bad Block News Today
[Re: WO23Coronet]
#2621025
02/13/19 11:10 PM
02/13/19 11:10 PM
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Joined: Jan 2004
Posts: 13,247 Mt. Vernon, Ohio
dartman366
I Live Here
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I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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to me the earlier blocks are too much of a crap shoot for finding a thick block for the money some guys want for them,, I bought two 1975 530 blocks from two different people and both sonic'd out excellent(over 280 non thrust and over 300 thrust) and as far as the cast iron, my machinist told me that my block was as hard of material as he has ever tried to machine ,said it was much harder than any chevy or ford block.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Bad Block News Today
[Re: HDNMOPERS]
#2621042
02/13/19 11:37 PM
02/13/19 11:37 PM
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Joined: Mar 2003
Posts: 1,467 Martinsville, IN
cdwmotorsports
pro stock
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pro stock
Joined: Mar 2003
Posts: 1,467
Martinsville, IN
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I have a 76 block. I’m glad I built it when I was 25 before all the haunting tales of this is too thin for a stroker stuff.... my engine guy built it and it’s been together for 2 decades.
Last edited by cdwmotorsports; 02/13/19 11:37 PM.
eBay-cdwmotorsports
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Re: Bad Block News Today
[Re: HDNMOPERS]
#2621053
02/13/19 11:55 PM
02/13/19 11:55 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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I used a 76 block. Don’t remember the numbers, but it was by far better than the 71/72 blocks I had at the time. Over the years, the bores did get a bit barrel shaped. Never any issues with the “thinner” main saddles. If I were to build another, Id sleeve it and run a smaller piston. The weak part of the blocks in my opinion is the cylinder walls. I used that block from 1992 until I sold the car in 2006. First year it was together made 776 hp on the dyno. When I sold it it was making over 1100hp.
"use it 'till it breaks, replace as needed"
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