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Re: What kills a big block?
[Re: hudsonhornet7x]
#2684524
08/05/19 01:36 AM
08/05/19 01:36 AM
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Joined: Jan 2003
Posts: 9,985
Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
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master
Joined: Jan 2003
Posts: 9,985
Frostbitefalls MN (Rocky&Bullw...
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Since my tuneup have always been conservative, I believe detonation then rpm combined with non center counter weighted heavy rotating assembly's will top the list, with stroke and compression coming in later, with stroke adding stress when rpm is high.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: What kills a big block?
[Re: Dragula]
#2684558
08/05/19 08:18 AM
08/05/19 08:18 AM
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Joined: Dec 2013
Posts: 4,669
Wichita
GY3
master
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master
Joined: Dec 2013
Posts: 4,669
Wichita
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Rotating weight, balance and RPM IMO.
I limit the 505 to 6400 rpm. It makes all the power down low anyway.
'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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Re: What kills a big block?
[Re: hemi-itis]
#2684577
08/05/19 09:28 AM
08/05/19 09:28 AM
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Joined: Feb 2005
Posts: 20,158
PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,158
PA.
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How many guys are really at the 750 horsepower mark. I'm not talking "happy Dyno" numbers, track numbers. Although I haven't been racing big blocks for the last 10 years in 30 years I hurt ONE block. And that block lasted 275 (8 second) passes before I found a crack. Do you know how long it would take most guys to make 275 passes at the track. A LONG TIME. That block didn't even have aluminum main caps which if I ever built a stock block again would.
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: What kills a big block?
[Re: hudsonhornet7x]
#2684578
08/05/19 09:29 AM
08/05/19 09:29 AM
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Joined: Oct 2007
Posts: 4,206
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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Reciprocating weight, rotating weight is annoying but relatively harmless.
Boffin Emeritus
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Re: What kills a big block?
[Re: tjmarcus1]
#2684623
08/05/19 10:55 AM
08/05/19 10:55 AM
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Joined: Jan 2003
Posts: 14,492
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,492
So. Burlington, Vt.
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It’s easy....... the blocks aren’t strong enough for that power level.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: What kills a big block?
[Re: fast68plymouth]
#2684635
08/05/19 11:22 AM
08/05/19 11:22 AM
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Joined: Aug 2003
Posts: 43,123
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,123
Bend,OR USA
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It’s easy....... the blocks aren’t strong enough for that power level.  OP, don't start a half serious BB build with either of those blocks if you want it to live around 800 HP at or above 7000 RPM, use a good 400 block with aluminum main caps and ARP main studs up to 850 HP 
Last edited by Cab_Burge; 08/05/19 11:23 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: What kills a big block?
[Re: Cab_Burge]
#2684659
08/05/19 12:26 PM
08/05/19 12:26 PM
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Joined: Feb 2005
Posts: 20,158
PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,158
PA.
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Just to throw something else out there years ago (over 30) we were running low to mid 10’s at 3000-3400 pounds with crack probe forged cranks and the only issue most of us had were the cranks. This was with stock rods, heavy trw and sealed power pistons and junk factory heads. If you were to take a stock .030 block, aftermarket forged stock stroke crank, aluminum main caps, aftermarket H beam rods, and a nice set of TrickFlow, ProMax, Indy, Edelbrock, etc etc heads are you telling me you couldn’t run well and stay together. If not you may need a new engine builder. Everyone has to build a Stroker engines just like they do with small blocks.
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: What kills a big block?
[Re: hudsonhornet7x]
#2684672
08/05/19 01:18 PM
08/05/19 01:18 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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Its easy to make 1000 hp with a low deck if you aren’t afraid of trying something new.
Slap some turbos, injection, and distributorless ignition on a B engine... you will have all the power you can use with a surplus.
Nitrous, blowers are hard on blocks and cranks.Trying to get over 800 hp on a n/a engine means extreme rpm and ragged edge timing.
You could make 800 hp with a turbo B engine for as long as you could feed it fuel, given a decent tune. Anyone arguing that point hasn’t tried it.
"use it 'till it breaks, replace as needed"
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Re: What kills a big block?
[Re: TRENDZ]
#2684684
08/05/19 01:59 PM
08/05/19 01:59 PM
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Joined: Nov 2003
Posts: 5,160
Texas
dannysbee
master
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master
Joined: Nov 2003
Posts: 5,160
Texas
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Anyone ever look at a small block Ford? Fist time I saw one tore down my thoughts were how in the world does one of those make it around the block without flying apart? But the ford racer guys were turbocharging them and making big hp. If one can do it with a small block ford, a b engine Mopar should not be a problem.
Getting old just means you were smarter than some and luckier than others.
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Re: What kills a big block?
[Re: dannysbee]
#2684693
08/05/19 02:46 PM
08/05/19 02:46 PM
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Joined: Jan 2003
Posts: 1,237
North Central, Indiana
Roughbird72
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,237
North Central, Indiana
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Anyone ever look at a small block Ford? Fist time I saw one tore down my thoughts were how in the world does one of those make it around the block without flying apart? But the ford racer guys were turbocharging them and making big hp. If one can do it with a small block ford, a b engine Mopar should not be a problem. Talking day and night comparing a SBF to a BBM. The late model 5.0 blocks break quite easily.
72 Plymouth Roadrunner 11.08@123.25
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Re: What kills a big block?
[Re: TRENDZ]
#2684734
08/05/19 04:30 PM
08/05/19 04:30 PM
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Joined: Oct 2007
Posts: 4,206
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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AFAIK there's a difference in power delivery between a Roots/screw blower (boost at idle if you want) and a ProCharger (boost roughly proportionate to the square of engine speed.
All of them (including turbos) have a smaller spike of maximum cylinder pressure (especially less than nitrous), lasting longer, and occurring later in the crank rotation, which appears to help with breakage.
Boffin Emeritus
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Re: What kills a big block?
[Re: pittsburghracer]
#2684770
08/05/19 06:35 PM
08/05/19 06:35 PM
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Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
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How many guys are really at the 750 horsepower mark. I'm not talking "happy Dyno" numbers, track numbers. Although I haven't been racing big blocks for the last 10 years in 30 years I hurt ONE block. And that block lasted 275 (8 second) passes before I found a crack. Do you know how long it would take most guys to make 275 passes at the track. A LONG TIME. That block didn't even have aluminum main caps which if I ever built a stock block again would. I am....and we have a format we stick to so they live....Been racing stroker big blocks regularly since 2012...We usually pull it apart over the winter for a freshen up, but not always.... You know why we run stock blocks at this level? Cause you can't get any aftermarket ones.....What are us bracket racers to do, buy billet block to run 9's or 10's, switch to the dark side and go get a cheppy? Honestly, this is what it has come to, and I am not happy about it, but we make it work. Yeah we could better heads on and go faster, or shift it 500rpm higher, but how long will a stock block last.......As one person said, that's Russian roulette... If you don't go crazy with it, and have a good tune up, it should last.....
Last edited by Dragula; 08/05/19 06:42 PM.
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Re: What kills a big block?
[Re: Dragula]
#2684773
08/05/19 06:49 PM
08/05/19 06:49 PM
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Joined: Mar 2008
Posts: 202
Barboursville, VA
belvedere383
enthusiast
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enthusiast
Joined: Mar 2008
Posts: 202
Barboursville, VA
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I think a stock block can live pretty well if the tuneup is right and you have a good machinist.
My current setup is about 3 season in and has had pretty good success.
Its a 66 383 block bored .060 over with ross pistons, manley rods, 440 source 4.25 crank. Indy EZ hand ported heads, indy R3 solid roller camshaft. Cast intake with 1050 dominator.
The car runs 10.0-10.1 on motor at 3610 lbs with a 275 drag radial. I spray it with nitrous on a single Induction solutions plate with a .076 nitrous jet (175hp) and it runs 9.0-9.1 at 149-150.
This combo has been together for about 3 years and seems to be doing just fine to this point, it has to be making somewhere around 1000 hp to the flywheel to run that mph at 3610.
65' Belvedere
496'' Stroker
Indy Heads
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Re: What kills a big block?
[Re: belvedere383]
#2684831
08/05/19 11:48 PM
08/05/19 11:48 PM
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Joined: Aug 2003
Posts: 43,123
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,123
Bend,OR USA
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I think a stock block can live pretty well if the tuneup is right and you have a good machinist.
My current setup is about 3 season in and has had pretty good success.
Its a 66 383 block bored .060 over with ross pistons, manley rods, 440 source 4.25 crank. Indy EZ hand ported heads, indy R3 solid roller camshaft. Cast intake with 1050 dominator.
The car runs 10.0-10.1 on motor at 3610 lbs with a 275 drag radial. I spray it with nitrous on a single Induction solutions plate with a .076 nitrous jet (175hp) and it runs 9.0-9.1 at 149-150.
This combo has been together for about 3 years and seems to be doing just fine to this point, it has to be making somewhere around 1000 hp to the flywheel to run that mph at 3610. When was the last time you had the oil pan off to look at the main webbing? BTW, that is a stout "383"  
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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