Re: 360 Block Question
[Re: clonestocker]
#2084807
06/02/16 07:59 PM
06/02/16 07:59 PM
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Joined: Dec 2005
Posts: 11,706 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,706
Fulton County, PA
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Cylinder wall thickness is not the only concern on the OE LA blocks. High RPM and/or 550+ HP, bulkheads and block webbing become areas of potential issues also.
If the results don't match the theory, change the theory.
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Re: 360 Block Question
[Re: CMcAllister]
#2084812
06/02/16 08:09 PM
06/02/16 08:09 PM
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Joined: Feb 2005
Posts: 20,201 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,201
PA.
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Cylinder wall thickness is not the only concern on the OE LA blocks. High RPM and/or 550+ HP, bulkheads and block webbing become areas of potential issues also. LOTS a fast stock block small blocks out there and I can't remember seeing or hearing of any block failures. And some of these guys are RPM crazy.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: 360 Block Question
[Re: pittsburghracer]
#2084860
06/02/16 09:53 PM
06/02/16 09:53 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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What's everyone's opinion on Magnum verses LA blocks regarding strength? Heard Magnums are a better ( stronger ) block?
Fastest 300
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Re: 360 Block Question
[Re: DARTH V8Я]
#2084871
06/02/16 10:14 PM
06/02/16 10:14 PM
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Joined: Feb 2005
Posts: 20,201 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,201
PA.
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Wait for HotRodDave.. he'll school you on the Magnum The guys that preach this never provide any proof. 3-2-1.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: 360 Block Question
[Re: HotRodDave]
#2085426
06/03/16 07:30 PM
06/03/16 07:30 PM
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Joined: Nov 2011
Posts: 2,154 Its a TRAP!
DARTH V8Я
Oh No!! I just had a moron attack!
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Oh No!! I just had a moron attack!
Joined: Nov 2011
Posts: 2,154
Its a TRAP!
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What? Weights? And guestimates that a magnum block can handle 100 more HP then LA blocks? Strange way to show proof. How many cracked Magnum heads are out there? 1 in 4? 3? Plenty of LA blocks running 600+ and living a long happy life. Anyways.. it's all about prep.
When it takes more than a sweet mullet to prove you rule at the trailer park..
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Re: 360 Block Question
[Re: clonestocker]
#2085498
06/03/16 08:42 PM
06/03/16 08:42 PM
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Joined: Jan 2005
Posts: 12,424 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,424
Kalispell Mt.
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There is extra meat where it counts, I posted pics. The iron is clearly harder, try grinding one block then the other. Cylinder walls though thinner on average are very much more consistant and the bad spots are not as bad as the older stuff and remember a chain is only as strong as it's weekest link, if you have one thin spot in a block with 1/2 inch thick bores it can wreck the entire thing. 9 out of 10 magnum heads are cracked... SO WHAT? How many does it cause a problem on? I never seen one and have worked with 100s of magnum powered trucks, if it was an issue you would see steam coming out the exhaust on most 92-03 dodge trucks. No stock head LA or Magnum makes enough power to bust any block (unless you get one with a thin spot of course) so who cares. Add on top of all that the 45 years of poor coolant maintnance corroding them up. I am not saying a LA block is a ticking time bomb but if you are really pushing the limits the mag block is stronger, how much I don't know but to deny it is stronger is foolish or in-experienced. As fer a 340 block, so what if you got .020 more clearance on 1/4 of the intake valve, .040 bore barely makes a measurable flow increase if any. Sure I would love to get a 4.25 siamese bore but for most heads out there it won't make any HP difference only more TQ but so will a dirt cheap roller cam. You can sell a 340 block buy a magnum, regrind the cam core bore and square deck it with the money.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 360 Block Question
[Re: clonestocker]
#2086033
06/04/16 08:33 PM
06/04/16 08:33 PM
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Joined: Jan 2005
Posts: 12,424 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,424
Kalispell Mt.
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Probably the only advantage under 600 hp is the cheap roller cam, I don't think the small weight difference matters in most builds.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 360 Block Question
[Re: clonestocker]
#2086808
06/06/16 02:09 AM
06/06/16 02:09 AM
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Joined: Nov 2011
Posts: 2,154 Its a TRAP!
DARTH V8Я
Oh No!! I just had a moron attack!
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Oh No!! I just had a moron attack!
Joined: Nov 2011
Posts: 2,154
Its a TRAP!
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According to race bulletin #8, July 1982:
"The early 360 ('71-'76) blocks are a special case. They use a 4.00" bore (340 was 4.04") but the block was made with the 340 water-jacket core. This means that these blocks can be bored to the same actual bore size as any 340 and have the same borewall thickness. This is NOT true of the newer 360's"
Basically there's enough "meat on the bone" to go to a 4.10" bore.
Cool.
When it takes more than a sweet mullet to prove you rule at the trailer park..
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Re: 360 Block Question
[Re: clonestocker]
#2087088
06/06/16 03:27 PM
06/06/16 03:27 PM
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Joined: Dec 2005
Posts: 11,706 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,706
Fulton County, PA
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I believe the "late" block began with 74. The casting numbers are different. Regardless, I wouldn't trust QC from the 70's and would have everything sonic checked for core shift, etc., before going crazy with one.
If the results don't match the theory, change the theory.
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Re: 360 Block Question
[Re: clonestocker]
#2087127
06/06/16 04:22 PM
06/06/16 04:22 PM
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Joined: Nov 2011
Posts: 2,154 Its a TRAP!
DARTH V8Я
Oh No!! I just had a moron attack!
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Oh No!! I just had a moron attack!
Joined: Nov 2011
Posts: 2,154
Its a TRAP!
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I know the 71-74's are 3418496 and use the 340 water-jackets. Maybe the 75-76 also. When did the start casting the 360 in MEXICO?
When it takes more than a sweet mullet to prove you rule at the trailer park..
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Re: 360 Block Question
[Re: clonestocker]
#2087292
06/06/16 08:26 PM
06/06/16 08:26 PM
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Joined: Oct 2009
Posts: 1,267 North, Alabama
D-50
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,267
North, Alabama
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I have a 1971 360 block that has been run bored .060 over since the early 90's. and has many NOS passes on it.
1.33 60 ft,6.21 at 110.59 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...
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Re: 360 Block Question
[Re: clonestocker]
#2087324
06/06/16 09:05 PM
06/06/16 09:05 PM
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Joined: Nov 2011
Posts: 2,154 Its a TRAP!
DARTH V8Я
Oh No!! I just had a moron attack!
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Oh No!! I just had a moron attack!
Joined: Nov 2011
Posts: 2,154
Its a TRAP!
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Jason over at Shady Dell speed shop seems to think .060 is alright on a 360.
When it takes more than a sweet mullet to prove you rule at the trailer park..
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Re: 360 Block Question
[Re: CMcAllister]
#2087364
06/06/16 10:24 PM
06/06/16 10:24 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I believe the "late" block began with 74. The casting numbers are different. Regardless, I wouldn't trust QC from the 70's and would have everything sonic checked for core shift, etc., before going crazy with one. Agreed & I think the first number went from a (3) to a (4).
live every 24 hour block of time like it's your last day on earth
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