Experts inside!
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From: Lombard .IL
Experts inside! Missing RPM! I'll make it as short as possible. LME 408 iron. 13.5 to 1. FMS cam 275-286 .735-.715 @112. Jesel shaft mount rockers. Solid roller. Rpm peaks at 6200????? It should peak around 7500! Torque peaks about 5500. Dropped the exhaust on the dyno and lost hp? A/F and timing doesn't help. Fast intake 90/90. I tried three different MAFs. LS6 heads.they flow 323 from .650 to .750 Intake valve is a 2.10. Heads are not great by any means, BUT stock heads with small valves should be able to run higher rpm than 6200? I'm lost. 
The intake manifold runner length is going to force your motor into peaking lower than you want plain and simple. If you run a sheet metal intake with runner length optimized for your rpm window, I'm sure you would make peak power at a much higher rpm level.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Thread Starter
6 Second Club Moderator
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Joined: Sep 2002
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From: Lombard .IL
Originally Posted by Patrick G
The intake manifold runner length is going to force your motor into peaking lower than you want plain and simple. If you run a sheet metal intake with runner length optimized for your rpm window, I'm sure you would make peak power at a much higher rpm level.
