Compstar vs magnum
Thread Starter
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From: Oskaloosa, Iowa
Compstar vs magnum What is the difference between them?
Im guessing compstar made in China and magnum made in the USA.
Beyond that what is physically different about a USA forging vs China that makes them stronger?
Im guessing compstar made in China and magnum made in the USA.
Beyond that what is physically different about a USA forging vs China that makes them stronger?
Thread Starter
Joined: Jun 2005
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From: Oskaloosa, Iowa
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To find out I think it’d take more digging than anyone on here can do. I’d almost be willing to bet though that the American made option is made with Chinese metal.
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If it has a Made In USA label on it it's got to be made with US sourced steel. Otherwise it should say manufactured in the US with foreign components or something similar.
Thread Starter
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From: Oskaloosa, Iowa
Pretty big price difference if both are forged in China. Quick search shows all cranks are inspected in the USA to verify quality and the magnum may go through additional heat treat processing.
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I used to work at a bread factory (in TX) and a lot of the raw ingredients came from overseas. It was American made bread though. Well, some of us were Americans making it.. 🤦🏻♂️😂
Last edited by Y2K_Frenzy; Jun 14, 2025 at 10:05 PM.
Thread Starter
Joined: Jun 2005
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From: Oskaloosa, Iowa
I found this article from 2024: https://moparconnectionmagazine.com/...ance-products/
They say Compstar cranks are forged overseas with Callies dies and raw steel mixed to Callies specs. The cranks are then inspected here in the US.
It also says Magnum cranks are forged and machined here in the US.
They say Compstar cranks are forged overseas with Callies dies and raw steel mixed to Callies specs. The cranks are then inspected here in the US.
It also says Magnum cranks are forged and machined here in the US.
Sonny Bryant billet crankshafts are really nice then again so are Lunati and Callies billet steel crankshafts.. They all have one thing in common too they're upwards of 5K for them.
Thread Starter
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From: Oskaloosa, Iowa
I was just considering the 8 cw compstar and trying to decide if going a step higher to the magnum was worth it. For my application 1200-1300 rwhp I think the compstar is probably good enough.
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"I always fit an "H" beam rod; they make MORE HP."
I'm afraid I have to call BS on this.
Rods don't make HP, it's everything above them plus the camshaft that makes HP. Rods just connect the piston to the crankshaft, period.
I'm afraid I have to call BS on this.
Rods don't make HP, it's everything above them plus the camshaft that makes HP. Rods just connect the piston to the crankshaft, period.
Thread Starter
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From: Oskaloosa, Iowa
Kind of like a 10 bolt rear robs less power than a 9” as long as it can actually handle the power levels of the vehicle.
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That reasoning doesn't apply to connecting rods
They don't affect power level
Thread Starter
Joined: Jun 2005
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From: Oskaloosa, Iowa
A 4l80 robs more power than a 4l60e as well I’d bet. Heavier driveshaft robs more power than a carbon fiber shaft. Turning more weight takes more power.