Hemi stroker combo - advice needed
#1378562
01/30/13 12:47 PM
01/30/13 12:47 PM
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Joined: Sep 2003
Posts: 1,260
Netherlands
72Challenger
OP
pro stock
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OP
pro stock
Joined: Sep 2003
Posts: 1,260
Netherlands
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Hi guys! Currently I'm in the planning / gathering stages of building a Hemi for the street so hydraulic cam, single carb, pumpgas etc. but as bigger is better I was wondering... Stock bore x stock stroke or maybe go for a 4.15 stroke or even 4.25 stroke? What combo crank / rod / piston would be needed for the 4.25 stroker? Off the shelf parts? Any pro's / con's / advice etc. is appreciated. At this moment I only have the block and heads besides some minor parts. Big thanks 
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Re: Hemi stroker combo - advice needed
[Re: 72Challenger]
#1378563
01/30/13 03:26 PM
01/30/13 03:26 PM
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Joined: Jan 2012
Posts: 2,645
Stuttgart, Arkansas
rickseeman
master
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master
Joined: Jan 2012
Posts: 2,645
Stuttgart, Arkansas
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At least a 472, depending on which block you have. Mainly off the shelf parts, so to speak. Don't need anything too fancy for that application. Just some cubic inches. Might be easier to get a rotating assembly from someone to fit your bore.
2011 Drag Pak Challenger
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Re: Hemi stroker combo - advice needed
[Re: 72Challenger]
#1378564
01/30/13 03:36 PM
01/30/13 03:36 PM
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Joined: Aug 2003
Posts: 43,157
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,157
Bend,OR USA
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I built a new motor for a local customer for his 1968 Charger R/T, not a original Hemi car,He wanted a new block so I bought a World block that was 4.190 rough bored at his insistence, I wanted to buy the 4.490 rough bore but he wanted stock bore size. I had it finished bored and hone with a torque plate to 4.25 and used a 4.25 stroke crank with BB Chevy rod journal sizes and a set of BB Chevy type forged steel 7.100 H beam rods and a semi custom set of Diamond low compression pistons,9.75 to 1 ratio, he wanted to use a set of used stock type Mopar iron heads off of a crate motor he had. I used a custom grind Comp Cams hydraulic roller lifter cam with there old noisy hydraulic roller lifters,(4 yrs ago)   He is very happy with that combination, lots of torque  He uses a set of 3.73 gears in his Dana 60 and a 28 or 29 inch tall tire, that combination flat moves that big heavy car, no enlightment done, big audio amp in the trunk along with a 34 gallon fuel cell  He likes to drive that car in the good weather 
Last edited by Cab_Burge; 01/31/13 04:25 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Hemi stroker combo - advice needed
[Re: Cab_Burge]
#1378565
01/30/13 03:41 PM
01/30/13 03:41 PM
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Joined: Jul 2006
Posts: 4,179
California
mickm
master
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master
Joined: Jul 2006
Posts: 4,179
California
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just depends where you want to go. to a point, building bigger inches doesn't cost anything more. stock stroke is 3.75. 4.15 crank will cost you the same (roughly) and get you 472 inches with the stock bore. now it is just up to you. what block you have, how far you want to take it.
my old motor is a 472, my new one is a 540, 4.25 stroke by 4.5 bore. i think in the end, the only real increase was the cost the machine work, (my block was a 4.19 bore, so taking it to 4.5 cost a few pennies more).
i haven't looked, but i don't think the cost of a stock stroke, 4.15 or 4.25 crank is that much different, if at all. rods are rods, and so are pistons, if you are ordering out of the catalog. custom is custom, and nothing here is too custom.
for a little or not much more, you can easily have a 540 over a 426.
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Re: Hemi stroker combo - advice needed
[Re: Cab_Burge]
#1378566
01/30/13 06:20 PM
01/30/13 06:20 PM
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Joined: Jan 2003
Posts: 6,392
nielsville, minn.
quickd100
master
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master
Joined: Jan 2003
Posts: 6,392
nielsville, minn.
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Using a 4.25"bore you can get the following displacements; 4.15" crank 471 4.25" ..... 482 4.50" ..... 511 4.75" ..... 539 If the crank is available with a 2.2" rod journal use it, and if it's available with a chevy width journal all the better. Personally, I'd go with the largest displacement your wallet can stand. Dave 
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Re: Hemi stroker combo - advice needed
[Re: 72Challenger]
#1378567
01/30/13 08:52 PM
01/30/13 08:52 PM
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Joined: May 2008
Posts: 902
Mopar Lane,Mississippi
67HEMI
super stock
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super stock
Joined: May 2008
Posts: 902
Mopar Lane,Mississippi
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Mine is a 4.31 bore x 4.25 stroke which is a 4.96. The only drawback of the small bore size so far is we had to machine an eyebrow at the top of the cylinder for the larger than stock 2.300 intake valve.
'33 Plymouth 5 Window Coupe Blown Aluminum HEMI w/bolt ons (under construction)
'69 Chrysler 300 Convertible 375 HP 440
'71 Plymouth Duster 360 W/EFI (Wife's Ride)
'12 Ram MegaCab Dually 6.7 Cummins
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Re: Hemi stroker combo - advice needed
[Re: Brian Hafliger]
#1378571
01/31/13 01:29 AM
01/31/13 01:29 AM
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Joined: Dec 2007
Posts: 12,587
Great Neck,LI,new york
hemi-itis
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 12,587
Great Neck,LI,new york
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When I had mine built,I used a mega block with 4.390 bore and a 4.5 Bryant billet crank.The machinist suggested the 4.5 bore for a square 472 ci,I chose the smaller bore so i'd have room to grow when I hurt it next time.It's not "IF",,,,,,,,,it's "when" 
HEMI-ITIS has no cure.
My condition is fully BLOWN!!
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Re: Hemi stroker combo - advice needed
[Re: hemi-itis]
#1378572
01/31/13 09:47 AM
01/31/13 09:47 AM
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Joined: Sep 2003
Posts: 1,260
Netherlands
72Challenger
OP
pro stock
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OP
pro stock
Joined: Sep 2003
Posts: 1,260
Netherlands
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Thanks so far guys!
So what we know right now is...
it will be a stroker
have and will use a 4.25 finished bored / honed block
iron stock heads
So either a
4.15 stroke crank (Eagle 444241506760 ?) with 6.86 rods
or
4.25 stroke crank (Eagle 444242507100 ?) with 7.10 chevy rods
When I check I see more then one chevy 7.100 rod, anybody any advice or part# ?
And what pistons to use with both combinations?
Still determining last bits so I can start gathering parts.
Thanks again!
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Re: Hemi stroker combo - advice needed
[Re: dogdays]
#1378574
01/31/13 03:36 PM
01/31/13 03:36 PM
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Joined: Jul 2006
Posts: 4,179
California
mickm
master
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master
Joined: Jul 2006
Posts: 4,179
California
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Quote:
There is NO REASON to do less than a 4.25" stroke, unless you have a cubic inch limit in a racing class.
There is NO REASON to use anything other than a bigblock chevy style rod as they are the standard for most big motors. (Well, if you had a brand new set of Crowers in stock size on the shelf that'd be a reason.)
If you have all the money in the world I'd say get either Crower or Oliver or Carrillo.
If you have a budget I'd suggest either K1 or 440Source or Scat, haven't checked them lately.
For pistons you want shelf stock forged slugs that weigh the least, all Hemi pistons seem to be really heavy so even "lightweight" pistons will be heavy.
Put it all together and you'll have a super engine that will make unbelievable torque and love to rev. You should be able to knock 400 - 500 grams off the stock weight for each hole.
R.
 lots of good off the shelf pistons these days. i think i marked it down somewhere, but my CP pistons weighed over 100 grams lighter than stock. i went with the 7.1 rods. got them from tim banning at FHO. many good sources out there to talk with, he is one of them.
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Re: Hemi stroker combo - advice needed
[Re: mickm]
#1378575
01/31/13 04:16 PM
01/31/13 04:16 PM
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Joined: Jan 2011
Posts: 4,785
Utah and Alaska
astjp2
master
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master
Joined: Jan 2011
Posts: 4,785
Utah and Alaska
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Why not use a 4.5 stroke Molner forged crank and rods with the 2.2 journal size. Its the same money and another 30 cubic inches. The longer the stroke, the more torque available. If you have a world block, I used the external oiling to the front of the block using milodon road race pan 31581. I would NOT use a hydraulic roller, the valve train issues and clearancing are horrible. You can get a good Crane roller setup or Bullet cams and not have to do much grinding on the block and heads for clearnance. Tim
1941 Taylorcraft
1968 Charger
1994 Wrangler
1998 Wrangler
2008 Kia Rio
2017 Jetta
I didn't do 4 years and 9 months of Graduate School to be called Mister!
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