2008 C6 M6 Stock Bottom End Heads/Cam Vs 427 shortblock with same heads/cam..
01-22-2009, 10:14 AM
#1
2008 C6 M6 Stock Bottom End Heads/Cam Vs 427 shortblock with same heads/cam.. 2008 C6 M6 LS3
Original Modifications Include:
TEA Stage I CNC LS3 Heads- Stock Valves/.650 lift dual spring kit
Vengeance Racing Stage II LS3 Camshaft
American Racing 1 7/8 Longtubes with catted X pipe
MagnaFlow Catback
Ported Throttlebody
VaraRam Induction
Stock Intake
Stock clutch
Stock Pulley
Customer recently returned and decided to add some cubes
Only change in the graph below is the addition of an LS3 427 shortblock
Yella Terra Ultra Lite L92/LS3 Rockers
Idle Clip of 427 thru catted X pipe/MagnaFlow Catback
http://www.youtube.com/watch?v=0uSJvipluP8
Part throttle drivability
http://www.youtube.com/watch?v=bNTxYfmk54k
Thru town with a short 1/2 blip
http://www.youtube.com/watch?v=q2KWgS47R2Y
Original Modifications Include:
TEA Stage I CNC LS3 Heads- Stock Valves/.650 lift dual spring kit
Vengeance Racing Stage II LS3 Camshaft
American Racing 1 7/8 Longtubes with catted X pipe
MagnaFlow Catback
Ported Throttlebody
VaraRam Induction
Stock Intake
Stock clutch
Stock Pulley
Customer recently returned and decided to add some cubes
Only change in the graph below is the addition of an LS3 427 shortblock
Yella Terra Ultra Lite L92/LS3 Rockers
Idle Clip of 427 thru catted X pipe/MagnaFlow Catback
http://www.youtube.com/watch?v=0uSJvipluP8
Part throttle drivability
http://www.youtube.com/watch?v=bNTxYfmk54k
Thru town with a short 1/2 blip
http://www.youtube.com/watch?v=q2KWgS47R2Y
Last edited by Ron@Vengeance; 01-24-2009 at 06:35 PM.
01-22-2009, 01:39 PM
#4
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Great comparison, can you explain why she seems to die so quickly above 6000 rpms and the original motor seems to still be making power ?? Whats the bottleneck on the 427 ?
Either way there is so much more power under the curve the rapid fall off up top shouldn't even be a concern. At any rate what would be required on the 427 to keep the power building ??
Either way there is so much more power under the curve the rapid fall off up top shouldn't even be a concern. At any rate what would be required on the 427 to keep the power building ??
01-22-2009, 03:21 PM
#6
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Great comparison, can you explain why she seems to die so quickly above 6000 rpms and the original motor seems to still be making power ?? Whats the bottleneck on the 427 ?
Either way there is so much more power under the curve the rapid fall off up top shouldn't even be a concern. At any rate what would be required on the 427 to keep the power building ??
Either way there is so much more power under the curve the rapid fall off up top shouldn't even be a concern. At any rate what would be required on the 427 to keep the power building ??
When putting this motor together the customer did not care about topend power that is why he wanted cubes. When I assembled the engine I degreed the camshaft to do that per the request of customer.
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01-23-2009, 08:59 AM
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More cubes less rpms needed to make serious power. Sounds similar to my build. I re used my h/c from my 346 on the new 402 and got similar results to your customer. Huge increase in power under the curve. Congrats Vengeance on yet another successful build.
01-24-2009, 08:42 AM
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01-24-2009, 08:44 AM
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Wow, you're right! I read uncorrected on the sheet and for some reason equated that to STD numbers. So both SAE(the industry standard) and STD which is standard correction would both read quite a bit lower HP and TQ numbers than using uncorrected when it's really cold outside? Learn something new everyday!
01-24-2009, 08:48 AM
#14
Great comparison, can you explain why she seems to die so quickly above 6000 rpms and the original motor seems to still be making power ?? Whats the bottleneck on the 427 ?
Either way there is so much more power under the curve the rapid fall off up top shouldn't even be a concern. At any rate what would be required on the 427 to keep the power building ??
Either way there is so much more power under the curve the rapid fall off up top shouldn't even be a concern. At any rate what would be required on the 427 to keep the power building ??
01-24-2009, 08:48 AM
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Wow, you're right! I read uncorrected on the sheet and for some reason equated that to STD numbers. So both SAE(the industry standard) and STD which is standard correction would both read quite a bit lower HP and TQ numbers than using uncorrected when it's really cold outside? Learn something new everyday!
Look here for how big the differences are in this weather, SAE and UNCORRECTED are both posted. SC weather is about on par with GA weather.
https://ls1tech.com/forums/dynamomet...uer-v-3-a.html
