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smallblock whats beter 4" stroke or 3.79 #1093880
10/13/11 07:58 PM
10/13/11 07:58 PM
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mo
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ALKYW5DART Offline OP
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ALKYW5DART  Offline OP
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mo
looking to build a new shortblock its going to be a r block or ritter i have w5 heads that flow 333 on intake at 700 1050 dominator and indy carb roller cam of course, 727 brake and 5500 stall 430 gears with 28" tire car weighs 3150 with me which would make more power 4" stroke or 3.79 stroke

Re: smallblock whats beter 4" stroke or 3.79 [Re: ALKYW5DART] #1093881
10/13/11 08:04 PM
10/13/11 08:04 PM
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Posts: 11,701
Portage,michigan
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B3422W5 Offline
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Portage,michigan
I dont think it would run any worse with the 3.79 crank, than the 4 inch crank. The fact of the matter is that EVEN w5's are too small for anything over 400 cubic inches, Imo. I know my w5 headed 422 was flat gulping for air at about 1150 feet in the 1/4. The 4 inch crank will lower the effective power band down a little, and that might make it more appealing.


69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8

Re: smallblock whats beter 4" stroke or 3.79 [Re: B3422W5] #1093882
10/13/11 08:08 PM
10/13/11 08:08 PM
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441 Offline
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Leon441  Offline
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Lynchburg, VA
If it will flow 333 on the intake it should handle a 4" stroke.

But, that said, stroke just lowers the power band. In most cases we would not want to turn 10,000 RPM so we elect to go with more stroke and turn 8,500.

I like strokers easier to choose converters and easier to maintain compared to a short stroker making the same power.

Leon


Career best 8.02 @ 169 at 3050# and 10" tires small block power.
Re: smallblock whats beter 4" stroke or 3.79 [Re: Leon441] #1093883
10/13/11 08:20 PM
10/13/11 08:20 PM
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Posts: 11,701
Portage,michigan
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B3422W5 Offline
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My w5 heads " supposedly" flowed 330ish as well, and on one bench they went 297 and on another bench a near identical set of heads were just a touch over 300 max, so numbers are just numbers.

Mine that went 297/303/330 depending on what one wants to believe did go 9.80's at 3350 pounds on a near stock suspension, so..who knows..

But a w5 is for a fact a " small" head for a 400+ inch race motor with a huge 4 inch stroke crank...mine wheezed at the top end,at 7000+ rpm, just small head relatively speaking. That small 2.08 max intake valve just isnt suited for optimal performance on a big inch long arm motor..will it run good, sure, are the heads a governor to a degree on a big inch motor..absolutely.


69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8

Re: smallblock whats beter 4" stroke or 3.79 [Re: B3422W5] #1093884
10/13/11 11:07 PM
10/13/11 11:07 PM
Joined: Feb 2003
Posts: 3,456
Out West
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408strokerdart Offline
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Out West
I like the 3.79 stroker for those heads at 396 cid. Turn it 7500 rpm all day long with good parts.

Re: smallblock whats beter 4" stroke or 3.79 [Re: 408strokerdart] #1093885
10/14/11 12:51 AM
10/14/11 12:51 AM
Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
cheapstreetdustr Offline
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acworth / N. georgia - south e...
where are you finding 3.79" cranks?
yrs back i looked everywhere for one...and couldnt find.
i needed a 385" max cube rule engine for a cheapstreet class..
cheapst


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: smallblock whats beter 4" stroke or 3.79 [Re: Leon441] #1093886
10/14/11 01:02 AM
10/14/11 01:02 AM
Joined: Mar 2007
Posts: 3,300
Northern Indiana
Dunnuck Racing Offline
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Dunnuck Racing  Offline
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Posts: 3,300
Northern Indiana
Quote:

If it will flow 333 on the intake it should handle a 4" stroke.

But, that said, stroke just lowers the power band. In most cases we would not want to turn 10,000 RPM so we elect to go with more stroke and turn 8,500.

I like strokers easier to choose converters and easier to maintain compared to a short stroker making the same power.

Leon




I agree,select the right cam and gearing and you can make good use of a 4" stroke,maybe even more stroke. Set it up to make some torque instead of winding it to the moon and your valvetrain will thank you.
Keith

Re: smallblock whats beter 4" stroke or 3.79 [Re: Dunnuck Racing] #1093887
10/14/11 06:55 AM
10/14/11 06:55 AM
Joined: Jan 2004
Posts: 143
Buenos Aires, ARGENTINA
madmax2 Offline
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madmax2  Offline
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Posts: 143
Buenos Aires, ARGENTINA
Who makes pistons for 3.79?


'70 Dodge GTX sb 418ci (Early A-body),
Lunati Solid cam 270°/243°@.050/.548", Edelbrock Heads, Weiand X-CELerator,
Holley Terminator EFI, Tremec 6 sp manual, 3.90:1, TTI Headers.
Re: smallblock whats beter 4" stroke or 3.79 [Re: madmax2] #1093888
10/14/11 09:56 AM
10/14/11 09:56 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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MR_P_BODY  Offline
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Romeo MI
Quote:

Who makes pistons for 3.79?




You can get pistons from any of the companies... 3
of my engines run the 3.79 crank... my W-9 with the
3.79 uses a CP piston, my W-2 has the 3.79 with Ross
pistons... my 416 has the 4" crank with Diamond pistons
EDIT
I liked the fact that Diamond would change the compression
height on a set of pistons for $35 extra.... I think
I'll be using them more often... plus they are local
so I can pick them up

Last edited by MR_P_BODY; 10/14/11 10:22 AM.
Re: smallblock whats beter 4" stroke or 3.79 [Re: cheapstreetdustr] #1093889
10/14/11 10:13 AM
10/14/11 10:13 AM
Joined: Feb 2009
Posts: 1,532
off the grid
340B5 Offline
pro stock
340B5  Offline
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Posts: 1,532
off the grid
Both K1 and Callies sell a 3.79 stroke crank.


Yeah, it's got a smallblock.
Re: smallblock whats beter 4" stroke or 3.79 [Re: 340B5] #1093890
10/14/11 01:18 PM
10/14/11 01:18 PM
Joined: Jan 2003
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dogdays Offline
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If you are head limited the engine will make the same power at 5% less rpm. So if it's 7500 with the 3.79, then it's 7100 with the four incher. If the heads aren't the limiting factor then you'll make 5% more power with the longer stroke.

Build the biggest shortblock you can afford.

There's a quote from Larry Widmer that goes something like this, "RPM means ruins people's motors."

R.

Re: smallblock whats beter 4" stroke or 3.79 [Re: dogdays] #1093891
10/14/11 03:30 PM
10/14/11 03:30 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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MR_P_BODY  Offline
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Romeo MI
Quote:

If you are head limited the engine will make the same power at 5% less rpm. So if it's 7500 with the 3.79, then it's 7100 with the four incher. If the heads aren't the limiting factor then you'll make 5% more power with the longer stroke.

Build the biggest shortblock you can afford.

There's a quote from Larry Widmer that goes something like this, "RPM means ruins people's motors."

R.




I dis-agree with that last statement... it makes more
power... a pro stock turns 10K+ for a reason... more
power

Re: smallblock whats beter 4" stroke or 3.79 [Re: MR_P_BODY] #1093892
10/14/11 07:10 PM
10/14/11 07:10 PM
Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
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dusturbd340W5 Offline
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Kissimmee Fl.
I know my Indybrocks sure liked the 4" stroke it would run 9.7xx at 138 in a 3000# car with what i call a milder solid roller


70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4
Re: smallblock whats beter 4" stroke or 3.79 [Re: Leon441] #1093893
10/14/11 07:15 PM
10/14/11 07:15 PM
Joined: Jan 2003
Posts: 9,963
Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
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Frostbitefalls MN (Rocky&Bullw...
Quote:

If it will flow 333 on the intake it should handle a 4" stroke.

But, that said, stroke just lowers the power band. In most cases we would not want to turn 10,000 RPM so we elect to go with more stroke and turn 8,500.

I like strokers easier to choose converters and easier to maintain compared to a short stroker making the same power.

Leon



I agree. Big Blocks with similar head flow keep getting faster with more stroke, all the way to 512 cubes and the same airflow you have.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: smallblock whats beter 4" stroke or 3.79 [Re: gregsdart] #1093894
10/16/11 11:42 PM
10/16/11 11:42 PM
Joined: Jan 2005
Posts: 12,406
Kalispell Mt.
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HotRodDave Offline
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Kalispell Mt.
I bet any money if they changed the rules to allow bigger pro-stock motors they would run them tommorow even if it meant lower RPM.

A 4 inch stroke is only a limit to RPM and NOT power or ultimately speed! Run the biggest cubes you can afford, that being said BPE makes it easy and affordable to run a 4.25 crank if you have 340 mains and 4.125 if you have 360 mains.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: smallblock whats beter 4" stroke or 3.79 [Re: HotRodDave] #1093895
10/16/11 11:58 PM
10/16/11 11:58 PM
Joined: Nov 2003
Posts: 10,384
Upstate NY
Bigcube Offline
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Upstate NY
BIGGER is ALWAYS better


Jim

Re: smallblock whats beter 4" stroke or 3.79 [Re: Bigcube] #1093896
10/17/11 11:34 AM
10/17/11 11:34 AM
Joined: Jan 2007
Posts: 3,695
nc
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emarine01 Offline
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nc
Quote:

BIGGER is ALWAYS better


... So your saying that the whole motion of the ocean thing is out....







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