Did I max out my heads??
09-25-2005, 09:08 AM
#1
10 Second Club
Thread Starter
iTrader: (14)
Join Date: Mar 2002
Location: Kansas City, KS
Posts: 2,893
Likes: 0
Received 0 Likes
on
0 Posts
Did I max out my heads?? I finally got my new cam installed and dyno'd. was expecting a ~10rwhp gain and the powerband moved up some...
blue line is old FMS 246/250 .632 110+4
red line is new FMS 253/261 .642 110+4
how did my power band not move up?? and why are they identical from 4500+? I'm guessing my heads are maxed out, but had not seen anyone post anything like it before.
my heads are 5.7L milled .031, 2.02 intake 1.57 exhaust.
flow #'s
lift; intake; exhaust
.100 70 54
.200 149 110
.300 218 154
.400 264 197
.500 286 222
.550 292 228
.600 293 233
here it is with a 100 TNT wet shot
blue line is old FMS 246/250 .632 110+4
red line is new FMS 253/261 .642 110+4
how did my power band not move up?? and why are they identical from 4500+? I'm guessing my heads are maxed out, but had not seen anyone post anything like it before.
my heads are 5.7L milled .031, 2.02 intake 1.57 exhaust.
flow #'s
lift; intake; exhaust
.100 70 54
.200 149 110
.300 218 154
.400 264 197
.500 286 222
.550 292 228
.600 293 233
here it is with a 100 TNT wet shot
Last edited by 383ss; 09-25-2005 at 10:03 AM.
09-25-2005, 12:58 PM
#2
TECH Junkie
Join Date: Aug 2002
Location: Fort Collins, CO
Posts: 3,726
Likes: 0
Received 0 Likes
on
0 Posts
I think so.
I would recommend a set of ET Performance 240CC cylinder heads for your application. Let me know if you're interested. I can get you some pricing and availability information.
I would recommend a set of ET Performance 240CC cylinder heads for your application. Let me know if you're interested. I can get you some pricing and availability information.
09-25-2005, 01:59 PM
#3
10 Second Club
Thread Starter
iTrader: (14)
Join Date: Mar 2002
Location: Kansas City, KS
Posts: 2,893
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by KingCrapBox
I think so.
I would recommend a set of ET Performance 240CC cylinder heads for your application. Let me know if you're interested. I can get you some pricing and availability information.
I would recommend a set of ET Performance 240CC cylinder heads for your application. Let me know if you're interested. I can get you some pricing and availability information.
thanks, I had been emailing Craig @ ET Performance about them and what I need. I'll get in contact with you when I decide to order.
09-25-2005, 03:45 PM
#5
TECH Junkie
Join Date: Aug 2002
Location: Fort Collins, CO
Posts: 3,726
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by 383ss
thanks, I had been emailing Craig @ ET Performance about them and what I need. I'll get in contact with you when I decide to order.
09-25-2005, 04:48 PM
#6
10 Second Club
Thread Starter
iTrader: (14)
Join Date: Mar 2002
Location: Kansas City, KS
Posts: 2,893
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by 52172
550/535 are still some very stout numbers through ls1 castings!! I wonder what you would put down with the ET heads? Could pick up another 30 rwhp!
the 265's flow 21 more at 400, 38 more at .500, and 58 more at .600 than mine.
09-25-2005, 05:09 PM
#7
TECH Junkie
Join Date: Aug 2002
Location: Fort Collins, CO
Posts: 3,726
Likes: 0
Received 0 Likes
on
0 Posts
You could expect to see some rather large gains with a really set of cylinder heads. Those ET heads will flow 350 @ .650 with a 4.030 bore. With 50 more CFM of air you will see a VERY nice power increase.
Trending Topics
09-25-2005, 06:04 PM
#9
TECH Junkie
Join Date: May 2003
Location: its fucking cold
Posts: 3,050
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by 52172
I don't think I have seen anyone break 555 rwhp with a 408 ever!! Be the first one!
It's been done (at least) once before, and that was through a very heavy drivetrain. I think it's kinda funny that the most powerful 408's come from FMS.
09-25-2005, 06:06 PM
#10
TECH Junkie
Join Date: Aug 2002
Location: Fort Collins, CO
Posts: 3,726
Likes: 0
Received 0 Likes
on
0 Posts
It's all in the cylinder heads. Now that companies like ET offer kickass cylinder heads for large stroker engines I think we'll start to see more 550HP 408's and such.
09-25-2005, 07:09 PM
#11
10 Second Club
Thread Starter
iTrader: (14)
Join Date: Mar 2002
Location: Kansas City, KS
Posts: 2,893
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by 52172
I don't think I have seen anyone break 555 rwhp with a 408 ever!! Be the first one!
I'm going to have these heads hogged out and put in 2.08 valves and see what it does. then I'll go to some ET heads
09-25-2005, 07:55 PM
#12
Banned
iTrader: (1)
Join Date: Nov 2004
Location: North of Seattle
Posts: 2,057
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by BlueSix
https://ls1tech.com/forums/showthread.php?t=244034
It's been done (at least) once before, and that was through a very heavy drivetrain. I think it's kinda funny that the most powerful 408's come from FMS.
It's been done (at least) once before, and that was through a very heavy drivetrain. I think it's kinda funny that the most powerful 408's come from FMS.
I believe he is probably talking about pump gas. 14:1 compression 280+ duration cam on c16 isn't really all that streetable unless you own a race track and drive to work
Nate
09-25-2005, 10:41 PM
#15
10 Second Club
Thread Starter
iTrader: (14)
Join Date: Mar 2002
Location: Kansas City, KS
Posts: 2,893
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by 52172
why would you want to put more money into your ls1 heads when you can put that money towards the new ET heads?
09-26-2005, 12:23 AM
#16
9 Second Club
iTrader: (22)
Join Date: Dec 2001
Location: Chicago
Posts: 1,474
Likes: 0
Received 0 Likes
on
0 Posts
I'm looking forward to the E.T heads, but the question is is what intake are we going to use to get all the cfm into the motor? A ported FAST 90 is good for 284cfm, a ls6 is good for 260cfm. So whats the point of 350cfm if we'll never see it?
09-26-2005, 11:06 AM
#18
10 Second Club
Thread Starter
iTrader: (14)
Join Date: Mar 2002
Location: Kansas City, KS
Posts: 2,893
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by ONEBADWS6
I'm looking forward to the E.T heads, but the question is is what intake are we going to use to get all the cfm into the motor? A ported FAST 90 is good for 284cfm, a ls6 is good for 260cfm. So whats the point of 350cfm if we'll never see it?
09-26-2005, 11:27 AM
#19
Originally Posted by ONEBADWS6
I'm looking forward to the E.T heads, but the question is is what intake are we going to use to get all the cfm into the motor? A ported FAST 90 is good for 284cfm, a ls6 is good for 260cfm. So whats the point of 350cfm if we'll never see it?
__________________
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.
09-26-2005, 11:32 AM
#20
TECH Junkie
Join Date: Aug 2002
Location: Fort Collins, CO
Posts: 3,726
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Patrick G
Better cylinder heads will make more power, even with a restrictive intake manifold. Why do you think NASCAR restrictor plate motors run the highest flowing cylinder heads they can find? Because they STILL make more power.