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Thoughts on Small block strokers #3091046
11/01/22 11:17 PM
11/01/22 11:17 PM
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Posts: 335
Red Deer, Alberta
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Greenwood Offline OP
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Greenwood  Offline OP
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Red Deer, Alberta
Well, it appears that I'm SOL on replacing one piston and two rods in the aftermath of my little rod slinging event. Gotta throw a sleeve in it, but that's pretty much it for block work. But, along with a complete set of rods and pistons, I've got to put a different crank in it. I picked up a pretty decent stock unit from a friend, but it will need a grind and a balance. Given all that, I am seriously leaning to putting a stroker in it. So, cast or forged crank? I spin to 7K now. Probably max it at 65-6600 with the big arm. Thoughts and advice?

Re: Thoughts on Small block strokers [Re: Greenwood] #3091048
11/01/22 11:58 PM
11/01/22 11:58 PM
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Portage,michigan
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B3422W5 Offline
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I drove over a cast stroker crank( 4 inch arm Eagle) 20 odd years ago at the track.
No cast cranks for me after that.
For the small difference in cost, when looking at the whole build, it isn’t worth it.

You will be happy. My current small block stroker is very mild, but still lots of fun, they are a great upgrade over stock stroke, less rpm and more torque.
Need any help, plenty of us on here are very familiar with them


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: Thoughts on Small block strokers [Re: Greenwood] #3091055
11/02/22 01:45 AM
11/02/22 01:45 AM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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Cab_Burge Offline
I Win
Cab_Burge  Offline
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Bend,OR USA
What block and what application? Street, race or both?
How big are you wanting to make the motor now? Which heads, intake and cam type?
I've built some SB stoker motors for both race only and street and strip using from 3.750 stroke up to 4.00 in both 340 and 360 motors. Mopar use to sell a good forged 3.79 stroke race crank with the 8 bolt Hemi rear flange that should take a lot of abuse work I would look at using a crank with SB Chevy rod pin sizes and a good after market race rod with either 6.125 or 6.250 long rods scope up twocents


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Thoughts on Small block strokers [Re: Greenwood] #3091082
11/02/22 09:01 AM
11/02/22 09:01 AM
Joined: Oct 2003
Posts: 11,678
W. Kentucky
justinp61 Offline
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Posts: 11,678
W. Kentucky
I love strokers, small blocks that think they are big blocks. Do you have good heads? My 408 had a pretty decent set of ported Edelbrocks and was fastest being shifted at 6400-6600. Yes, it would turn more rpms but there was no reason to do it. As far as cranks go, I'd be looking at forged.

You are at a place where a stroker makes sense, you need pistons, rods and the crank you have needs work. I'd go for it, even if later on I had to upgrade the heads.

Re: Thoughts on Small block strokers [Re: Greenwood] #3091145
11/02/22 12:42 PM
11/02/22 12:42 PM
Joined: Oct 2007
Posts: 4,205
New York
polyspheric Offline
master
polyspheric  Offline
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Posts: 4,205
New York
less rpm and more torque

Always


Boffin Emeritus
Re: Thoughts on Small block strokers [Re: polyspheric] #3091167
11/02/22 02:06 PM
11/02/22 02:06 PM
Joined: Jan 2003
Posts: 9,963
Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
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Frostbitefalls MN (Rocky&Bullw...
Originally Posted by polyspheric
less rpm and more torque

Always
plus the average hp goes up at the bottom of each gear, a significant advantage. Build it as big as is reasonable! You will never regret it.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: Thoughts on Small block strokers [Re: Greenwood] #3091179
11/02/22 03:00 PM
11/02/22 03:00 PM
Joined: Jan 2003
Posts: 5,484
SoCal
Brian Hafliger Offline
master
Brian Hafliger  Offline
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Posts: 5,484
SoCal
Originally Posted by Greenwood
Well, it appears that I'm SOL on replacing one piston and two rods in the aftermath of my little rod slinging event. Gotta throw a sleeve in it, but that's pretty much it for block work. But, along with a complete set of rods and pistons, I've got to put a different crank in it. I picked up a pretty decent stock unit from a friend, but it will need a grind and a balance. Given all that, I am seriously leaning to putting a stroker in it. So, cast or forged crank? I spin to 7K now. Probably max it at 65-6600 with the big arm. Thoughts and advice?


Definitely go 4340 crank and rods, either Molnar or Scat..4" stroke. Icon pistons and good rings. Easy Peezy!!


Brian Hafliger
Re: Thoughts on Small block strokers [Re: gregsdart] #3091180
11/02/22 03:00 PM
11/02/22 03:00 PM
Joined: Aug 2003
Posts: 4,963
new jersey usa
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11secdart Offline
master
11secdart  Offline
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new jersey usa
Stroker!!! my 408 was mild at 9.8 to 1 compression for pump gas... R3 block , 600 lift mech.cam , and Indy 360-1 heads made 539 hp and 502 torque .. the amount of torque is what impressed me ! it ran 10.60s in my Dart until the Eagle crank cracked .. imo stay away from cast cranks , as said my combo was mild but had potential to run way faster with a little head porting and a roller cam. With the amount of torque it made I was able to use a 4.10 gear ... it 60ft'ed the same as my non stroker 367 with 4.88s

Last edited by 11secdart; 11/03/22 08:33 AM.

68 Dart 410 / 904
92 D150 original owner
21 Ram 1500 Quad Cab, Big Horn , Hemi ,4x4
23 Audi Q5
16 Honda HRV
Re: Thoughts on Small block strokers [Re: 11secdart] #3091188
11/02/22 03:26 PM
11/02/22 03:26 PM
Joined: Feb 2005
Posts: 20,116
PA.
pittsburghracer Offline
"Little"John
pittsburghracer  Offline
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PA.


I love them both
My sons stock crank 360 has gone 6.54 several times with a .620 lift rolller at 3200 pounds

My 408 has gone best of 5.98 but usually 6.03 at app 2830 pounds with a .650 lift roller cam.
Both engines had the same Edelbrock heads, and both were shifted at 6700rpm. I can’t speak for his but my 408 was begging to be shifted higher. Now I’m giving up some ET with my 14-32 slicks compared to his 10 inch radials.


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




Re: Thoughts on Small block strokers [Re: pittsburghracer] #3091195
11/02/22 04:28 PM
11/02/22 04:28 PM
Joined: Oct 2007
Posts: 2,808
Wisconsin
wkroncke17 Offline
master
wkroncke17  Offline
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Wisconsin
Just finished mine, very happy.
Engine is a .30 over 360 with a Rod Bloomer 4.125 crank/kit to equal 420 cubic inches.
Compression is near 10.5:1 eddy heads gasket matched and some bowl blending/Hughes roller rockers.
Hydraulic roller cam .573 lift around 250 @50 duration. Eddy Super Victor intake with a Holley 750HP that flows 820.
904 with 2.76 low gear set, T/A manual valve body and a PTC converter that flash stalls right about 4000 rpm.
4:30 gear is a little too much, Going with a 4:10, maybe 3:91 as some street us will be in order.

Best of luck!!

Demon Launch 2.jpgDemon Time.jpg
Re: Thoughts on Small block strokers [Re: Greenwood] #3091216
11/02/22 05:19 PM
11/02/22 05:19 PM
Joined: Nov 2015
Posts: 870
Missouri
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jwb123 Offline
super stock
jwb123  Offline
super stock
J

Joined: Nov 2015
Posts: 870
Missouri
I have built several 360 block strokers really good bang for the buck. If you need a crankshaft, then by all means do a stroker. under 500HP a cast crank works fine over, I would go with a forged unit.

Re: Thoughts on Small block strokers [Re: jwb123] #3091260
11/02/22 08:21 PM
11/02/22 08:21 PM
Joined: Jan 2003
Posts: 20,645
So Near, Yet So Far
topside Offline
Too Many Posts
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So Near, Yet So Far
There's really no reason to avoid a stroker, unless you don't want to re-gear or you really like high RPM.
But for best results at the track, you're gonna need better heads: W2s, W5s, Indybrocks, or TFS.
Did a 4.030 x 4.00 iron-head 360 Duster some years ago, great street car.

Re: Thoughts on Small block strokers [Re: Greenwood] #3091318
11/03/22 06:36 AM
11/03/22 06:36 AM
Joined: Dec 2006
Posts: 3,391
Pa
Hot 340 Offline
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Hot 340  Offline
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Posts: 3,391
Pa
There's quite a difference between the Scat and Eagle castings. The Eagles will literally break in a stock rebuild application. LOOK at the cross section of those cranks leading up to the rod crankpin. Ridiculously thin. Absolute garbage. The Scat's castings are thicker and more money. At that point might as well put a steel one in it. Why throw mallory in a stupid casting anyway.

Re: Thoughts on Small block strokers [Re: Hot 340] #3091319
11/03/22 06:54 AM
11/03/22 06:54 AM
Joined: Oct 2015
Posts: 570
UK
rb446 Offline
mopar
rb446  Offline
mopar

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Posts: 570
UK
Originally Posted by Hot 340
There's quite a difference between the Scat and Eagle castings. The Eagles will literally break in a stock rebuild application. LOOK at the cross section of those cranks leading up to the rod crankpin. Ridiculously thin. Absolute garbage. The Scat's castings are thicker and more money. At that point might as well put a steel one in it. Why throw mallory in a stupid casting anyway.


My mate just ordered a 4.150 Eagle kit to build his 493BB, I told him no, lets hope it holds up, its a 650>700hp brkt build.

On the SB stoker we got a guy here who runs a very mild 340/416 in a sorted Demon in our NSS class>
Stock J heads 2.02
10:1CR
Hyd. cam, .475"/.494", @.050?
small hdrs
air gap 750DP, now a TR with 2 650DP's
makes around 415fwhp and goes 11.50's, has been in the 11.3's@117, around 3200lbs
shifts@5600, traps near 6000, Hughes 3500stall
3.91's/28" slicks, SS springs..

Last edited by rb446; 11/03/22 07:51 AM.

1969 'Cuda 446ci, best 9.96@133.9 in 1990
1971 340 'Cuda, best 11.01@122.8 in 1987
Re: Thoughts on Small block strokers [Re: rb446] #3091353
11/03/22 10:15 AM
11/03/22 10:15 AM
Joined: Oct 2004
Posts: 2,799
Connecticut
FurryStump Offline
master
FurryStump  Offline
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Posts: 2,799
Connecticut
I would go forged, I have run, and am still running a Scat 4” cast crank. With thousands of passes and many thousands of street miles on the crank. It has been turned once and was still straight at that point. It has also been balanced to within 1/2 gram by someone with decades and decades of experience. Shift 6400-6500 and cross the stripe at 6900 rpm. Getting a forged crank gives you room to grow. I’m stuck trying to decide to go roller with the current short block or wait until I can build another forged short block. I’m a little over 400 hp. Runs 117.22 at 3353 lbs. If you do go cast, Scat.


best of 11.39 at 117 mph 1.60 60’. 68 340 S Barracuda Fastback F.A.S.T [IMG]http://i67.tinypic.com/2mnnnnt.jpg[/IMG]
Re: Thoughts on Small block strokers [Re: B3422W5] #3091379
11/03/22 12:34 PM
11/03/22 12:34 PM
Joined: Jan 2005
Posts: 12,408
Kalispell Mt.
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HotRodDave Offline
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Kalispell Mt.
Originally Posted by B3422W5
I drove over a cast stroker crank( 4 inch arm Eagle) 20 odd years ago at the track.
No cast cranks for me after that.
For the small difference in cost, when looking at the whole build, it isn’t worth it.

You will be happy. My current small block stroker is very mild, but still lots of fun, they are a great upgrade over stock stroke, less rpm and more torque.
Need any help, plenty of us on here are very familiar with them



SCAT cast is lightyears better than eagle, I wouldn't put an eagle cast crank in a stock head stock cam motor, I have seen it done and it broke. On the other hand I have seen a lot of people put a SCAT cast to the test and never seen one break. Now for my ultimate disclaimer... if it was my money I would go straight to a forged crank if I could find one I would go 4.125 or even 4.250, the TQ is crazy fun with these and even the longer strokes fit in there just fine.


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



Re: Thoughts on Small block strokers [Re: HotRodDave] #3091424
11/03/22 02:45 PM
11/03/22 02:45 PM
Joined: Dec 2005
Posts: 11,408
Fulton County, PA
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CMcAllister Offline
Mr. Helpful
CMcAllister  Offline
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Fulton County, PA
I've run stock 360 cast cranks over 500HP and 7400 RPM. I've known Super Stock guys to push them harder. Never had a problem, famous last words. I was more concerned with the block at that point. The fret marks on the mating surfaces of the main caps to block told me they were dancing around.

I've always thought the 4.06 - 4.100 with a 3.79 or 3.80 crank was a nice combination. Good rod ratio, could rev it up.

Last edited by CMcAllister; 11/03/22 02:46 PM.

If the results don't match the theory, change the theory.
Re: Thoughts on Small block strokers [Re: CMcAllister] #3091435
11/03/22 03:12 PM
11/03/22 03:12 PM
Joined: Jan 2003
Posts: 20,645
So Near, Yet So Far
topside Offline
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So Near, Yet So Far
^^^ Good point about the block.
When I kicked a couple rods out of my drag-race 340 many years ago, and took a good analytical look at the pan rails & webs, the 1st thing I bought was an R block.
Yeah, I know there's a lot of guys making big power with the spindly stock blocks, but this little 368" engine's still running low 10s with no issues @ 620-640 HP.
Eagle forged crank & H-beams, JE pistons.

Re: Thoughts on Small block strokers [Re: topside] #3091492
11/03/22 09:17 PM
11/03/22 09:17 PM
Joined: May 2003
Posts: 13,182
aZLiViN
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J_BODY Offline
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aZLiViN
I think our 4” stroke 6” rod combo is pretty cool!

Re: Thoughts on Small block strokers [Re: J_BODY] #3091509
11/03/22 10:20 PM
11/03/22 10:20 PM
Joined: Sep 2017
Posts: 335
Red Deer, Alberta
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Greenwood Offline OP
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Greenwood  Offline OP
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Red Deer, Alberta
Well, I only race 1/8, so I won't re-gear. But, it does seem to make sense to spend the modest extra bit for a forged crank. I'll have just over .600 lift (roller), and the heads are modestly ported J's. If I shoot for 11.0 compression, I should see a bit more hp than before, and a substantial jump in torque.

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