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LS3 dry sump/Stroker cranks

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Old Jul 31, 2018 | 05:10 PM
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Default LS3 dry sump/Stroker cranks

Are any of the aftermarket LS3 long snout cranks (Callies for example) compatible with an LS7 style OEM dry sump system?

I understand going to an aftermarket Dry Sump is best- But I haven't experienced any oil issues with the C6 GS or the C6 Z06 with aftermarket suspension bits and race tires (Hoosiers usually). Nor have I experienced any oil issues with my LS6 running shocks, T1 Sways, and big ol' 315's each corner (turned in well and nicely radius'd my fenders for me).

Engine is an LS3 of 4XX CI (416 or 427 most likely) going into a C5Z for HPDE, Drifting, daily driving... occasional road trip. Would like to keep my AC and power steering.
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Old Aug 1, 2018 | 08:41 AM
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I'm not sure about compatibility, but from what I've seen the issue isn't with oiling under cornering. Windage and oil aeration can become a problem with big stroke cranks on the oem dry sump system.
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Old Aug 1, 2018 | 10:46 AM
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Originally Posted by Black0ut
Are any of the aftermarket LS3 long snout cranks (Callies for example) compatible with an LS7 style OEM dry sump system?

I understand going to an aftermarket Dry Sump is best- But I haven't experienced any oil issues with the C6 GS or the C6 Z06 with aftermarket suspension bits and race tires (Hoosiers usually). Nor have I experienced any oil issues with my LS6 running shocks, T1 Sways, and big ol' 315's each corner (turned in well and nicely radius'd my fenders for me).

Engine is an LS3 of 4XX CI (416 or 427 most likely) going into a C5Z for HPDE, Drifting, daily driving... occasional road trip. Would like to keep my AC and power steering.
I believe the aftermarket long snout cranks are all compatible with the LS7 dry sump. You might want to talk to Erik Koenig at HPR in McKinney. They do a lot of 4.250” stroke stuff for GSpeed and their road race corvettes.
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Old Aug 1, 2018 | 02:53 PM
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Originally Posted by Broken944
I'm not sure about compatibility, but from what I've seen the issue isn't with oiling under cornering. Windage and oil aeration can become a problem with big stroke cranks on the oem dry sump system.
That's what I've heard too... and there are a LOT of online forums posted about LS3/7 failures but nothing I've actually seen or experienced in person even with other people running LS3/7 cars at track days around me and beating the **** out of them.

Originally Posted by KCS


I believe the aftermarket long snout cranks are all compatible with the LS7 dry sump. You might want to talk to Erik Koenig at HPR in McKinney. They do a lot of 4.250” stroke stuff for GSpeed and their road race corvettes.
Excellent! I'll have to contact him and brainstorm!

I was originally thinking of going with a 4.000"-ish crank and make up the rest with bore (I think TSP and Katech both offer short/Long blocks with a 4.000" stroke that I've been using for math purposes). Though if I increase stroke a bit I can get a little more displacement and a bump in torque- maybe won't need to wind my engine out to 6000+ RPM.
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Old Aug 1, 2018 | 03:01 PM
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Originally Posted by Black0ut
Excellent! I'll have to contact him and brainstorm!

I was originally thinking of going with a 4.000"-ish crank and make up the rest with bore (I think TSP and Katech both offer short/Long blocks with a 4.000" stroke that I've been using for math purposes). Though if I increase stroke a bit I can get a little more displacement and a bump in torque- maybe won't need to wind my engine out to 6000+ RPM.
Erik likes to use the LS3 blocks at 4.07” bore with a 4.250” crank for 442ci. With a sleeved standard deck block, they’ve gotten 472ci.
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Old Aug 1, 2018 | 05:41 PM
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Originally Posted by KCS


Erik likes to use the LS3 blocks at 4.07” bore with a 4.250” crank for 442ci. With a sleeved standard deck block, they’ve gotten 472ci.
NO STOP YOU'RE GIVING ME BAD IDEAS. I don't need 442 CI-> 471 CI. Nope. No. Not at all. Maybe. Good god yes.

But in all seriousness that's very interesting/cool. I didn't know you could go that big with an LS3. 472 CI in any car would be nuts. On a road racing car I couldn't imagine. I wouldn't ever need to shift out of 4th gear and I bet I could idle that damn thing around the race track and still leave two black marks when I leave the corners.

I've been contemplating phoning Katech, Texas Speed, and Mast Motorsports just to pick brains on what I could do to have some fun with an LS3. May have to start with HPR first.
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