Did I max out my heads?? - LS1TECH



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Did I max out my heads??

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Old 09-25-2005, 10:08 AM   #1
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Default 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


Last edited by 383ss; 09-25-2005 at 11:03 AM.
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Old 09-25-2005, 01:58 PM   #2
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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.
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Old 09-25-2005, 02:59 PM   #3
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Quote:
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.

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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Old 09-25-2005, 03:31 PM   #4
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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!
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Old 09-25-2005, 04:45 PM   #5
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Quote:
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.
Sounds good.
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Old 09-25-2005, 05:48 PM   #6
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Quote:
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!
I would expect to be close to 600rwhp. this is a hydraulic cam also.
the 265's flow 21 more at 400, 38 more at .500, and 58 more at .600 than mine.
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Old 09-25-2005, 06:09 PM   #7
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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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Old 09-25-2005, 06:49 PM   #8
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I don't think I have seen anyone break 555 rwhp with a 408 ever!! Be the first one!
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Old 09-25-2005, 07:04 PM   #9
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Quote:
Originally Posted by 52172
I don't think I have seen anyone break 555 rwhp with a 408 ever!! Be the first one!
N/A FMS 408ci Dyno & Video....577 RWHP!!!

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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Old 09-25-2005, 07:06 PM   #10
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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.
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Old 09-25-2005, 08:09 PM   #11
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Quote:
Originally Posted by 52172
I don't think I have seen anyone break 555 rwhp with a 408 ever!! Be the first one!
highest hydraulic that FMS has done did 568. most seem to do in the 520-530 range.

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
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Old 09-25-2005, 08:55 PM   #12
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Quote:
Originally Posted by BlueSix
N/A FMS 408ci Dyno & Video....577 RWHP!!!

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

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Old 09-25-2005, 10:07 PM   #13
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Thats right I should have worded it differently, but I was referring to pump gas hydraulic roller cams.
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Old 09-25-2005, 10:18 PM   #14
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why would you want to put more money into your ls1 heads when you can put that money towards the new ET heads?
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Old 09-25-2005, 11:41 PM   #15
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Quote:
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?
because I can.
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Old 09-26-2005, 01:23 AM   #16
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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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Old 09-26-2005, 08:50 AM   #17
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wait for the ET manifold I guess should be at the PRI show. Coming out next year. Or buy ET's ls7 heads and run the ls7 intake.
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Old 09-26-2005, 12:06 PM   #18
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Quote:
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?
good point.
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Old 09-26-2005, 12:27 PM   #19
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Quote:
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?
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.
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Old 09-26-2005, 12:32 PM   #20
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Quote:
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.
Just what I was going to say...
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