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How big can you stroke a gen III hemi? #3063764
07/29/22 10:58 PM
07/29/22 10:58 PM
Joined: Jan 2003
Posts: 21,599
San Jose,CA
migsBIG Offline OP
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migsBIG  Offline OP
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Joined: Jan 2003
Posts: 21,599
San Jose,CA
Since Mopar guys always can’t leave engines stock, has anybody built a stroker late model hemi and if so, how big did they make it? I’m kinda curious as there seems to be a lot more tech for these engines and might be worth a change from a big block engine.

Re: How big can you stroke a gen III hemi? [Re: migsBIG] #3063809
07/30/22 08:55 AM
07/30/22 08:55 AM
Joined: Sep 2004
Posts: 1,828
houston texas
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gremlinsteve Offline
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houston texas
I’ve seen a 4.250 stroke crank
I don’t know if there has been bigger


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Re: How big can you stroke a gen III hemi? [Re: gremlinsteve] #3063821
07/30/22 10:01 AM
07/30/22 10:01 AM
Joined: Nov 2003
Posts: 1,825
NW Indiana
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fbs63 Offline
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NW Indiana
I'm sure others will disagree but there is a limit to how much stroke you can package effectively in a 9.24 or 9.28 deck height. The pistons for the 4.080 stroke crank are barely over 1" compression height with a 6.125 rod. Thats 1.50 rod ratio. More stroke means a shorter rod and then you start to pull the piston out of the bore at the bottom of the stroke too much. Technically the limiting factor is the main oil passage casting above the crank. I know BB Chevy 632 and such combos have 1.47 RR and run great but they have large bores and GREAT heads. It will take Thitek's best heads, LARGE solid roller cam and adjustable rockers at minimum to feed a 4.250 stroke on one. Just my opinion.

Re: How big can you stroke a gen III hemi? [Re: fbs63] #3063840
07/30/22 11:31 AM
07/30/22 11:31 AM
Joined: Aug 2011
Posts: 2,842
Pattison Texas
CSK Offline
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Pattison Texas

265464238_2042809972547545_9094496563090535978_n.jpg
Last edited by csk; 07/30/22 11:33 AM.

1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5

Re: How big can you stroke a gen III hemi? [Re: CSK] #3064077
07/31/22 01:42 PM
07/31/22 01:42 PM
Joined: Apr 2016
Posts: 371
NH, USA
toddinNH Offline
Egghead
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Joined: Apr 2016
Posts: 371
NH, USA
I'm sure there are unsmart people that will opt for the $10k plus stroker option from MMX, but for standard deck heights there are saner limits to what can be achieved. A 4.125" stroke should be accessible to most builders. Tom Molnar shows the 4.250" stroke, but that will require lots of compromises.

Re: How big can you stroke a gen III hemi? [Re: toddinNH] #3064144
07/31/22 06:39 PM
07/31/22 06:39 PM
Joined: Sep 2014
Posts: 1,395
Central Pa
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moparjim79 Offline
pro stock
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Joined: Sep 2014
Posts: 1,395
Central Pa
HHP sells a 440. N/a. Looks nice

Re: How big can you stroke a gen III hemi? [Re: moparjim79] #3064160
07/31/22 07:51 PM
07/31/22 07:51 PM
Joined: Jan 2003
Posts: 21,599
San Jose,CA
migsBIG Offline OP
YouTube is my go-to news source
migsBIG  Offline OP
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Joined: Jan 2003
Posts: 21,599
San Jose,CA
108 inch increase and it makes 1000hp. The torque numbers would probably fun factor awesome, but not sure if that would be well worth it or not. Do they supply it assembled or just the parts?







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