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Generation IV Internal Engine 2005-2014 LS2 | LS3 | LS7 | L92 | LS9

3.9" stroke builds

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Old Dec 7, 2024 | 09:52 AM
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Default 3.9" stroke builds
Anyone here running a 3.9" stroke here? I'm hoping to hear some results as I'm in the midst of building one.
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Old Dec 7, 2024 | 11:54 AM
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From: Little Austin
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Originally Posted by showdog75
Anyone here running a 3.9" stroke here? I'm hoping to hear some results as I'm in the midst of building one.
Are you using the Molnar 3.9" stroke crank?

Andrew
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Old Dec 7, 2024 | 12:11 PM
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What heads, cam and intake you goiing with ?
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Old Dec 7, 2024 | 12:50 PM
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I built a 398 a few years ago 4.03 bore 3.9 stroke.
No numbers though. I believe I read someone else was taking a 3.9 stroke to a dyno a few weeks ago don’t know if anything was ever posted.
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Old Dec 7, 2024 | 12:51 PM
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Theres been a handful done. More likely these days to read about l8t crank swaps though.
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Old Dec 7, 2024 | 04:34 PM
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From: Hixson TN
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Originally Posted by Project GatTagO
Are you using the Molnar 3.9" stroke crank?

Andrew
Andrew, I bought the crank from Brian Tooley Racing. The tech guy said it comes from Callies. No way to confirm other than his word.
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Old Dec 7, 2024 | 04:36 PM
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Originally Posted by Tuskyz28
What heads, cam and intake you goiing with ?
Mamo 223's Tony reworked and put larger intake valves in. Intake is a Mamo ported Fast 102. I'll chime back in with cam specs when I look them up.
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Old Dec 7, 2024 | 05:47 PM
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Originally Posted by Tuskyz28
What heads, cam and intake you goiing with ?

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Old Dec 7, 2024 | 05:50 PM
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From: Hixson TN
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Tusky, I'll be running 1.8 rockers so figure that to the lift and duration. Compression will be right at 11.5 shooting for .030 quench. I'll be curious to see what timing she'll like.
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Old Dec 9, 2024 | 12:35 PM
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This sounds like a great combination.

Andrew
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Old Dec 9, 2024 | 01:05 PM
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Old Dec 9, 2024 | 01:06 PM
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Plans are solid. Im curious to know what size the inake valve is in the head. Im sure the combo go make great power with Mamo heads. Should make 500 at the tire easily. Im making 480 to the tire with a similiar cam but with a Captain Insano Heads.
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Old Dec 9, 2024 | 03:02 PM
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From: Hixson TN
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Originally Posted by Tuskyz28
Plans are solid. Im curious to know what size the inake valve is in the head. Im sure the combo go make great power with Mamo heads. Should make 500 at the tire easily. Im making 480 to the tire with a similiar cam but with a Captain Insano Heads.
2.08 intake 1.57 exhaust
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Old Dec 9, 2024 | 03:35 PM
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From: Hixson TN
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Originally Posted by bthomas
Theres been a handful done. More likely these days to read about l8t crank swaps though.
I was looking into that as well but having to get a 8 bolt flywheel would've cost me $700-1000. No thanks
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Old Dec 9, 2024 | 06:10 PM
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Originally Posted by showdog75
Andrew, I bought the crank from Brian Tooley Racing. The tech guy said it comes from Callies. No way to confirm other than his word.
Or call Callies and see if they offer a 3.9
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Old Jun 27, 2025 | 03:51 PM
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It's close!!!



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Old Jun 27, 2025 | 04:01 PM
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From: Little Austin
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You're going to love that clutch.

Andrew
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Old Jun 27, 2025 | 04:05 PM
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From: Hixson TN
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Originally Posted by Project GatTagO
You're going to love that clutch.

Andrew
I got a killer deal on the clutch!!! $1000 and I had Rob(RPS) put new hubs in for $200. Used but zero wear on the disc.
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