LS7 intake vs. FAST intake cfm flow numbers
Thread Starter
Joined: Jul 2005
Posts: 531
Likes: 1
From: Texas, Europe, Iraq & Afghanistan
LS7 intake vs. FAST intake cfm flow numbers Does anyone know the flow (cfm) on a LS7 intake?
I am told the LS7 intake flows more than the FAST 90, but by how much?
This makes a difference to me when purchasing heads.
I have searched to no avail.
Thanks!
I am told the LS7 intake flows more than the FAST 90, but by how much?
This makes a difference to me when purchasing heads.
I have searched to no avail.
Thanks!
Moved from Advanced Tech.
__________________
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.
Originally Posted by Cobraeater
Do a search for Richard@WCCH. He did flowtests on both intakes and the L76 intake too.
LS7 Intake-330cfm
L76 Intake-300cfm
Fast 90 Intake-300cfm
LS7 Intake-330cfm
L76 Intake-300cfm
Fast 90 Intake-300cfm
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surprise 4.0 bore. 
Launching!
Joined: Dec 2003
Posts: 251
Likes: 2
From: Portland OR
Keep in mind that bench airflow is only one factor in intake power production. The length, cross section, and taper of the intake runners have a major impact on the RPM range of the engine, and the shape of the torque and power curves. Based on the hundreds of combos tested on this site and others, some generalizations can be made about these intakes:
As quite a few folks have now discovered, the L76 intake can't be coaxed to make peak power much past 6300. The LS7 intake will peak as high as 6600 or so, and the FAST a bit higher than that on smaller motors (346/362 CID) (all of these numbers assuming aggressive cam choice with late IVC). Porting may give more airflow, and slightly more power through the range, but doesn't change those peak RPM numbers much. Sheet metal or single-plane style intakes can move those peaks substantially higher, yielding higher peak HP numbers, but typically at the cost of lower torque in the 3500-5500 range.
As quite a few folks have now discovered, the L76 intake can't be coaxed to make peak power much past 6300. The LS7 intake will peak as high as 6600 or so, and the FAST a bit higher than that on smaller motors (346/362 CID) (all of these numbers assuming aggressive cam choice with late IVC). Porting may give more airflow, and slightly more power through the range, but doesn't change those peak RPM numbers much. Sheet metal or single-plane style intakes can move those peaks substantially higher, yielding higher peak HP numbers, but typically at the cost of lower torque in the 3500-5500 range.
