Head CFM Analysis
04-16-2006, 06:18 PM
#1
TECH Regular
Thread Starter
iTrader: (3)
Join Date: Dec 2005
Location: New Jersey
Posts: 403
Likes: 0
Received 0 Likes
on
0 Posts
Head CFM Analysis I'm no head expert... Trying to learn here. I've got a set of stock casting LS6 heads that were done by a sponser here. They flowed less than their advertised numbers and I'm not really sure if they are any good at all. Maybe some of you guys can chime in and let me know if these things are lacking. Yes I know buying a set of ETPs will be stupendous... I'm using these heads on my LS2 stroker. They are paid for and no money out of pocket beats $2500 out of pocket.
I know there are lots of variables that I'm not really sure I understand but these are the numbers from the flow sheet:
Lift CFM
.100 70.7
.200 143.7
.300 211.0
.400 262.5
.500 294.1
.550 300.8
.600 308.6
.650 309.5
2.055/1.60" valves
I know there are lots of variables that I'm not really sure I understand but these are the numbers from the flow sheet:
Lift CFM
.100 70.7
.200 143.7
.300 211.0
.400 262.5
.500 294.1
.550 300.8
.600 308.6
.650 309.5
2.055/1.60" valves
04-16-2006, 08:40 PM
#3
10 Second Club
iTrader: (14)
Join Date: Mar 2002
Location: Kansas City, KS
Posts: 2,893
Likes: 0
Received 0 Likes
on
0 Posts
those numbers look fine, but then again cfm doesn't mean a lot, especially high lift. I made 550rwhp with 293cfm @ 600 in my 408. do you know the runner volume?
04-16-2006, 09:06 PM
#4
Teching In
Join Date: Jun 2005
Location: Emporia, Kansas
Posts: 42
Likes: 0
Received 0 Likes
on
0 Posts
Im guessing the seller rated them around 320cfm. 320 is what an average set of 2.055 valve LS6 heads usually flow. But like they said, flow isnt everything. These heads will still make good power.
04-17-2006, 07:20 AM
#6
TECH Regular
Thread Starter
iTrader: (3)
Join Date: Dec 2005
Location: New Jersey
Posts: 403
Likes: 0
Received 0 Likes
on
0 Posts
I don't know the runner volume. They were advertised at around 320. I am going to use them regardless, so I guess I can post some numbers with a stock casting head vrs. everybody else's aftermarkets.
04-17-2006, 09:50 AM
#7
TECH Addict
iTrader: (16)
Join Date: Jul 2004
Location: Nevada, TX
Posts: 2,218
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by huggerorange99ss
Im guessing the seller rated them around 320cfm. 320 is what an average set of 2.055 valve LS6 heads usually flow. But like they said, flow isnt everything. These heads will still make good power.
Brandon
Trending Topics
04-17-2006, 10:09 AM
#8
For real world independant numbers, they look strong. Were your heads flowed on a 4.00" bore or something else? What bore size were they advertised on?
__________________
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
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
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
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
04-17-2006, 11:03 AM
#9
Teching In
Join Date: Jun 2005
Location: Emporia, Kansas
Posts: 42
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Patrick G
For real world independant numbers, they look strong. Were your heads flowed on a 4.00" bore or something else? What bore size were they advertised on?
04-17-2006, 11:41 AM
#10
TECH Regular
Thread Starter
iTrader: (3)
Join Date: Dec 2005
Location: New Jersey
Posts: 403
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by huggerorange99ss
This is very true, things like the bore size used on the flow bench and orifice clay can effect flow numbers greatly. What were the flow numbers above .650 lift? Also i hope they were flowed on range 5 @ 28".
