Did I max out my heads??
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From: Kansas City, KS
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; Sep 25, 2005 at 10:03 AM.
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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.
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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.
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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.
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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.
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From: its fucking cold
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.
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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
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
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?
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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?
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
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.
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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.