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4" Stroke Small block #1517958
10/15/13 05:02 PM
10/15/13 05:02 PM
Joined: Dec 2006
Posts: 487
Charleston, SC
S
SCDaytona Offline OP
mopar
SCDaytona  Offline OP
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Joined: Dec 2006
Posts: 487
Charleston, SC
I'm trying to help a buddy of mine who wants to put together a 4" stroker with a 340 stock block. Plans are to put in 4 bolt mains and 1/2 fill the block. Probably 0.030 over as well. This will be using W2 heads. Is this block going to hold up or not? Trying to keep this on budget and an R block is not in his budget.

Re: 4" Stroke Small block [Re: SCDaytona] #1517959
10/15/13 05:08 PM
10/15/13 05:08 PM
Joined: Jan 2003
Posts: 6,266
Renton Washington
T
Triple Threat Offline
master
Triple Threat  Offline
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Joined: Jan 2003
Posts: 6,266
Renton Washington
How much power is he trying to make? Ditch the 4 bolt main Idea. I think with a W2 head it will live a long happy life.

Sonic check the block for starters. You can't build mansion with a foundation of pebbles.

Last edited by Triple Threat; 10/15/13 05:10 PM.

-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA
Re: 4" Stroke Small block [Re: Triple Threat] #1517960
10/15/13 05:42 PM
10/15/13 05:42 PM
Joined: Jan 2003
Posts: 32,394
Q
Quicktree Offline
I Win
Quicktree  Offline
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Posts: 32,394
you will not get 4 bolt mains on a stock block i don't think.

Re: 4" Stroke Small block [Re: Quicktree] #1517961
10/15/13 05:46 PM
10/15/13 05:46 PM
Joined: Jan 2007
Posts: 685
pennsylvania
poboyengineering Offline
mopar
poboyengineering  Offline
mopar

Joined: Jan 2007
Posts: 685
pennsylvania
Quote:

you will not get 4 bolt mains on a stock block i don't think.



I got one this past year, part of a deal on a bunch of other stuff. cant say im real impressed with the 3/8th outer bolts, but they are billet caps.


It may be ugly, but it sure is slow.

Girls comb their hair in rear view mirrors and the boys try to look so hard....
Re: 4" Stroke Small block [Re: Quicktree] #1517962
10/15/13 05:47 PM
10/15/13 05:47 PM
Joined: Aug 2007
Posts: 2,224
Arlington, Tx.
B
BJS racing Offline
top fuel
BJS racing  Offline
top fuel
B

Joined: Aug 2007
Posts: 2,224
Arlington, Tx.
Quote:

you will not get 4 bolt mains on a stock block i don't think.




Actually Tony you can but in most cases it will actually make the block weaker. The weakness in a small block is in the main web. Drilling for the 4 bolt takes away from the little that is there.


Back in the swing of things at Painless again! Great to be back!
Re: 4" Stroke Small block [Re: SCDaytona] #1517963
10/15/13 06:41 PM
10/15/13 06:41 PM
Joined: Oct 2003
Posts: 7,506
Az
Crizila Offline
master
Crizila  Offline
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Joined: Oct 2003
Posts: 7,506
Az
Quote:

I'm trying to help a buddy of mine who wants to put together a 4" stroker with a 340 stock block. Plans are to put in 4 bolt mains and 1/2 fill the block. Probably 0.030 over as well. This will be using W2 heads. Is this block going to hold up or not? Trying to keep this on budget and an R block is not in his budget.


I'm doing it. No dyno #'s on the motor, but based on car weight, speed, ET, I'm guessing around 650HP. 360 stock block, 1/2 filled, 4 blt. Milodon caps. Motor in a blown application.


Fastest 300
Re: 4" Stroke Small block [Re: BJS racing] #1517964
10/15/13 06:57 PM
10/15/13 06:57 PM
Joined: Jan 2003
Posts: 32,394
Q
Quicktree Offline
I Win
Quicktree  Offline
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Joined: Jan 2003
Posts: 32,394
Quote:

Quote:

you will not get 4 bolt mains on a stock block i don't think.




Actually Tony you can but in most cases it will actually make the block weaker. The weakness in a small block is in the main web. Drilling for the 4 bolt takes away from the little that is there.


no kidding that was my point I wouldn't do it

Re: 4" Stroke Small block [Re: Crizila] #1517965
10/15/13 06:58 PM
10/15/13 06:58 PM
Joined: Jan 2003
Posts: 32,394
Q
Quicktree Offline
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Quicktree  Offline
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Joined: Jan 2003
Posts: 32,394
Quote:

Quote:

I'm trying to help a buddy of mine who wants to put together a 4" stroker with a 340 stock block. Plans are to put in 4 bolt mains and 1/2 fill the block. Probably 0.030 over as well. This will be using W2 heads. Is this block going to hold up or not? Trying to keep this on budget and an R block is not in his budget.


I'm doing it. No dyno #'s on the motor, but based on car weight, speed, ET, I'm guessing around 650HP. 360 stock block, 1/2 filled, 4 blt. Milodon caps. Motor in a blown application.


good luck, but why spend all that money and use a stock block?

Re: 4" Stroke Small block [Re: Quicktree] #1517966
10/15/13 08:13 PM
10/15/13 08:13 PM
Joined: Jan 2004
Posts: 993
Louisville, MS
Dustedu Offline
super stock
Dustedu  Offline
super stock

Joined: Jan 2004
Posts: 993
Louisville, MS
Sorry guys but I don't see the big deal, we have two engines like this. One with W5's and one with ported eddies that both have been punished with nos
I've been Putin alot of nos to the duster engine for the last four years and it seems to be ok. Maybe we are just lucky

Re: 4" Stroke Small block [Re: Dustedu] #1517967
10/15/13 08:46 PM
10/15/13 08:46 PM
Joined: Jan 2003
Posts: 32,394
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Quicktree Offline
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Quicktree  Offline
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Quote:

Sorry guys but I don't see the big deal, we have two engines like this. One with W5's and one with ported eddies that both have been punished with nos
I've been Putin alot of nos to the duster engine for the last four years and it seems to be ok. Maybe we are just lucky


how fast is it?

Re: 4" Stroke Small block [Re: Dustedu] #1517968
10/15/13 08:51 PM
10/15/13 08:51 PM
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441 Offline
master
Leon441  Offline
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Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
I ran a lot of power on a 70" 360 block bored 4.100" with no filler and stock caps.

If I were putting aftermarket caps on and filling I would prefer to use the Pro Gram caps with the splayed bolts.

Guess I was retarded for all those years I was winning local races with a stock block and NOS.

If I were going to go the race block direction I would just go ahead and go R3 with W7 or better heads and 48 degree lifters.

As long as I am holding back with a 59 degree deal I would just take the risk with the stock block.

Leon


Career best 8.02 @ 169 at 3050# and 10" tires small block power.
Re: 4" Stroke Small block [Re: Leon441] #1517969
10/15/13 08:53 PM
10/15/13 08:53 PM
Joined: Jan 2003
Posts: 32,394
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Quicktree Offline
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Quicktree  Offline
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Posts: 32,394
well there you have it, build away

Re: 4" Stroke Small block [Re: Quicktree] #1517970
10/15/13 10:25 PM
10/15/13 10:25 PM
Joined: May 2003
Posts: 13,182
aZLiViN
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J_BODY Offline
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Posts: 13,182
aZLiViN
I used some two bolt steel caps that BCR fabbed up many years ago. We had to elongate the bolt holes on a couple of them as they "missed" but our builder felt other than the inconvienience of straightening that out (at our cost of course...), no harm no foul. Bearings always looked good on the mains. think I'm using them for paper weights now that we've gone the R3 route. This was with our 4" stroke 340 that ran a best of 9.87 @ 138. There was alot more in it, but our W5 "issues" kept forcing us to r/r the engine more than we anticipated.

Re: 4" Stroke Small block [Re: Quicktree] #1517971
10/15/13 10:33 PM
10/15/13 10:33 PM
Joined: Jan 2004
Posts: 993
Louisville, MS
Dustedu Offline
super stock
Dustedu  Offline
super stock

Joined: Jan 2004
Posts: 993
Louisville, MS
Low to mid 5's on the bottle, best of 6.24 on motor at 3267

Re: 4" Stroke Small block [Re: Quicktree] #1517972
10/15/13 10:39 PM
10/15/13 10:39 PM
Joined: Dec 2006
Posts: 487
Charleston, SC
S
SCDaytona Offline OP
mopar
SCDaytona  Offline OP
mopar
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Joined: Dec 2006
Posts: 487
Charleston, SC
Thanks for all the responses. Some say yes and some say no. I know a couple racers at my track have ran the 3.79 crank for years with good luck with stock blocks, but they are not available any more unless you buy the top end cranks. Our plan was to put the pro gram billet caps on, 1/2 fill, 13-1 compression and roller cam around 650 to 700 lift. My only concern was with the 4" arm, the increased torque made on the block could be an issue long term.

Re: 4" Stroke Small block [Re: SCDaytona] #1517973
10/15/13 10:43 PM
10/15/13 10:43 PM
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt Offline
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1967dartgt  Offline
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Posts: 3,978
Hilltown Pa
I ran one for a while 421" with eddies,then battens and finally indys had a 618 roller and many nos passes. 69 340 block with stock caps, sold it to a guy in Ohio so it might still be running.


Brett Miller W9 cnc'd heads
STR Chassis fabraction
Re: 4" Stroke Small block [Re: SCDaytona] #1517974
10/15/13 10:49 PM
10/15/13 10:49 PM
Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
cheapstreetdustr Offline
master
cheapstreetdustr  Offline
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Posts: 6,257
acworth / N. georgia - south e...
just sonic the block first..
i have factory 72 360 block bored.040 ,factory crank and polished factory rods..
light pistons and balanced assy. no filler and stock caps...line bored..
running 6.67 at 3410lbs.built this motor in o4


365" Iron J heads,,3480lbs best 1.39 60ft on SS springs.10.54,124 mph ...6.67 1/8th et.average 60fts 1.46 w/ small cam &.063 no2 pill tagged & insured
[image][/image]
Re: 4" Stroke Small block [Re: cheapstreetdustr] #1517975
10/15/13 11:19 PM
10/15/13 11:19 PM
Joined: Oct 2003
Posts: 7,506
Az
Crizila Offline
master
Crizila  Offline
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Joined: Oct 2003
Posts: 7,506
Az
Quote:

just sonic the block first..
i have factory 72 360 block bored.040 ,factory crank and polished factory rods..
light pistons and balanced assy. no filler and stock caps...line bored..
running 6.67 at 3410lbs.built this motor in o4


Yes, my block sonic tested real good. It was an E58 block if that makes any difference. Had about 30 - 35 runs on it before I pulled it down a few weeks ago due to a burned piston. It is going back together right now. Bottom end looked great ( no cap walk and bearings were reusable )and will go back together as is. Had a few scores in the bad hole so I had to go another .010" over to 4.040" to clean it up. I know the block is the weak link in my build and 30-35 passes isn't much so - IMO, the verdict is still out re: reliability, but so far so good. I have made a few passes with as much as 25 lbs of boost, but I'm thinking of limiting it to around 15 lbs in the future with a smaller blower pulley. Pray for me .


Fastest 300
Re: 4" Stroke Small block [Re: Dustedu] #1517976
10/15/13 11:49 PM
10/15/13 11:49 PM
Joined: Aug 2008
Posts: 189
long island new york
K
kingdust Offline
member
kingdust  Offline
member
K

Joined: Aug 2008
Posts: 189
long island new york
Quote:

Sorry guys but I don't see the big deal, we have two engines like this. One with W5's and one with ported eddies that both have been punished with nos
I've been Putin alot of nos to the duster engine for the last four years and it seems to be ok. Maybe we are just lucky


good machine work goes along way! align hone the block with main studs, a good set of rods and lightweight pistons you should be fine. I had a 040 over 340 with a 318-3 race crank prepped 340 rods and ross 12.5 pistons with w2s with a 4spd and 489s. I drove it on the street and raced it for 7 years till it finally spun a bearing going through the traps @ 7500.


LIFE IS A LESSON,YOU LEARN IT WHEN YOUR THROUGH!
Re: 4" Stroke Small block [Re: SCDaytona] #1517977
10/16/13 12:04 AM
10/16/13 12:04 AM
Joined: Sep 2004
Posts: 1,499
San Antonio,TX
4
440W8 Duster Offline
pro stock
440W8 Duster  Offline
pro stock
4

Joined: Sep 2004
Posts: 1,499
San Antonio,TX
Quote:

Thanks for all the responses. Some say yes and some say no. I know a couple racers at my track have ran the 3.79 crank for years with good luck with stock blocks, but they are not available any more unless you buy the top end cranks. Our plan was to put the pro gram billet caps on, 1/2 fill, 13-1 compression and roller cam around 650 to 700 lift. My only concern was with the 4" arm, the increased torque made on the block could be an issue long term.




Tom Molnar has that crank available.


70 Duster W8 motor.
1.29 60ft 5.79 1/8 at 120 mph
glide with 1.80 gear
@3170 lbs.
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