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How big can you stroke a gen III hemi? #3063764
07/29/22 09:58 PM
07/29/22 09:58 PM
Joined: Jan 2003
Posts: 20,629
San Jose,CA
migsBIG Offline OP
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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 07:55 AM
07/30/22 07:55 AM
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houston texas
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gremlinsteve Offline
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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 09:01 AM
07/30/22 09:01 AM
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NW Indiana
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fbs63 Offline
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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 10:31 AM
07/30/22 10:31 AM
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Posts: 2,634
Pattison Texas
csk Offline
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265464238_2042809972547545_9094496563090535978_n.jpg
Last edited by csk; 07/30/22 10:33 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

Re: How big can you stroke a gen III hemi? [Re: csk] #3064077
07/31/22 12:42 PM
07/31/22 12:42 PM
Joined: Apr 2016
Posts: 127
NH, USA
toddinNH Offline
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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 05:39 PM
07/31/22 05:39 PM
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Central Pa
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moparjim79 Offline
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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 06:51 PM
07/31/22 06:51 PM
Joined: Jan 2003
Posts: 20,629
San Jose,CA
migsBIG Offline OP
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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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