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Re: 4" Stroke Small block
[Re: BJS racing]
#1517998
10/16/13 09:01 PM
10/16/13 09:01 PM
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Joined: Jan 2009
Posts: 1,044
Victoria, Australia
Ian
super stock
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super stock
Joined: Jan 2009
Posts: 1,044
Victoria, Australia
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I run stock 360 block std caps studs top and bottom 3/4 fill ,never dynoed it, at 3550 1.37 60 ft 6.0 113 and 9.57@142 over 750 hp would be my guess
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Re: 4" Stroke Small block
[Re: BJS racing]
#1517999
10/16/13 09:39 PM
10/16/13 09:39 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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A 340 piston weighs in at 720 grams, the 360 piston at 571, IIRC. There's NO WAY the 0.040" difference in bore could make a 150 gram difference.
Basically if you calculate that weight increases by something like the square of the diameter change, the piston should have weighed another 10 or 20 grams, or something like a 318 piston, at around 590 grams.
BTW, the 318 Poly, the early LA 318 and the 273 used THE SAME FORGING for the connecting rod. It weighed something like 725 grams. The 496 rods used in the 340, and the 645 rods used in the 340,360 and later on the 318, weighed 758 grams.
Put those overweight rods together with the overweight pistons and you see that 340s had a very portly rotating assembly. It should be easy to take a half a pound out of each piston/rod combo.
R.
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Re: 4" Stroke Small block
[Re: dusturbd340W5]
#1518002
10/17/13 12:30 AM
10/17/13 12:30 AM
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Joined: Jan 2003
Posts: 11,709
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,709
Portage,michigan
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Quote:
Quote:
This thread about if you can use a stock block and have success with a 4" crank and w-2 heads.
I have a bunch of high HP engines with stock 340/early 360 blocks, [basicly the same as a 340 casting], in service at this time. I have done them with the 4 bolt caps and my opinion it only adds to the cost of the finished project. Same with roller cams, No more power just a lot more money. In fact a couple times I have removed roller cams from customer engines and installed flat tappet cams and car has gone faster. Roller lifters fail and have ruined many a good bottom end. The only block failures I have experienced were due to other parts failing first.
well if removing the solid roller made the car go faster than the rest of the combo was not correct to begin with.
In a correct combo a solid roller WILL be faster. Oh and I have run many rollers including in a daily driven Vette and have never had a lifter failure.
Way to little or way to much spring can contribute to a failure with rollers, but if correct, they live happily for a long time.
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
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Re: 4" Stroke Small block
[Re: B3422W5]
#1518003
10/17/13 11:06 AM
10/17/13 11:06 AM
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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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Quote:
Quote:
Quote:
This thread about if you can use a stock block and have success with a 4" crank and w-2 heads.
I have a bunch of high HP engines with stock 340/early 360 blocks, [basicly the same as a 340 casting], in service at this time. I have done them with the 4 bolt caps and my opinion it only adds to the cost of the finished project. Same with roller cams, No more power just a lot more money. In fact a couple times I have removed roller cams from customer engines and installed flat tappet cams and car has gone faster. Roller lifters fail and have ruined many a good bottom end. The only block failures I have experienced were due to other parts failing first.
well if removing the solid roller made the car go faster than the rest of the combo was not correct to begin with.
In a correct combo a solid roller WILL be faster. Oh and I have run many rollers including in a daily driven Vette and have never had a lifter failure.
Way to little or way to much spring can contribute to a failure with rollers, but if correct, they live happily for a long time.
,but the problem with rollers is they need a lot of spring ( in a racing application ) due to the lobe profiles and the addidional weight over flat tappet stuff. It's the down side of roller cams / lifters. In milder cam applications (.600 lift area and under ), flat tappet cams compete quite well with roller cams. IMO, roller cams are over sold. Did I mention a lot less moving parts to fail with flat tappet cams.  Sorry this is so far away from the OP's original question. 
Fastest 300
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Re: 4" Stroke Small block
[Re: 1967dartgt]
#1518009
10/26/13 10:21 AM
10/26/13 10:21 AM
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Joined: Nov 2008
Posts: 23
East Palestine, Ohio 44413
Metallidart
member
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member
Joined: Nov 2008
Posts: 23
East Palestine, Ohio 44413
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Quote:
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.
That would be me, lol. Still working on collecting parts, I bought a 7 bedroom house that needed remodeled so that slowed me down alot. Still keeping my fingers crossed, it won't be at the rpms or power level you had it, so it might last awhile. Its getting a pair of ported long-valve Econo W2's and thick head gaskets for a drop in compression to about 10.4, and a solid custom grind cam in the upper 260's/270's@.050. I doubt I will be close to the 600hp mark, and I won't be running any NOS or anything.
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Re: 4" Stroke Small block
[Re: BJS racing]
#1518010
10/26/13 10:50 AM
10/26/13 10:50 AM
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Joined: Sep 2013
Posts: 168
Moparts
SSDart
member
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member
Joined: Sep 2013
Posts: 168
Moparts
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Quote:
Quote:
just curious to why your going with the 3.79 vs the 4.00 stroke. seems like more cubes the better. what are the benefits of the shorter stroke?
A shorter stroke engine it is easier and quicker to go up in the RPM's. Typically with a shorter stroke engine you can turn more RPM than with the longer stroke due to the rotating weight and centrifical forces that are increased as your stroke gets longer.
But what about the better rod ratio with the 4" stroke? Better piston speed....... lighter piston....... Yes a shorter stroke does do as you say above, but with the tall deck of the SBM it is a little different story.......
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Re: 4" Stroke Small block
[Re: SSDart]
#1518011
10/26/13 02:13 PM
10/26/13 02:13 PM
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Joined: Nov 2006
Posts: 1,086
Baton Rouge, La.
StandOnIt
super stock
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super stock
Joined: Nov 2006
Posts: 1,086
Baton Rouge, La.
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I am using a magnum 5.9 block, 4" crank, Iron Ram heads, eagle rods, ross pistons at 12 to 1 comp. Its in a 3300lb Volare running mid to high 10's at 122 mph. Been doing it for 7 years also. I did do a cam change a few years ago. Other than that, never taken a valve cover off it. Its a work horse! We guess its making arount 530 hp with no adders.
76' Volare, 5.9 magnum w/Iron heads. New best 10.68 at 123 mph 1/4 mile.
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