Desktop Dyno - Rectangular Port Heads - Team Camaro Tech
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post #1 of 10 (permalink) Old Dec 22nd, 04, 11:01 AM Thread Starter
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Jamie Noble
 
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Does anyone know where I might be able to find the specific values to plug into Desktop Dyno for standard "990" castings?
The only "canned" values in Desktop Dyno are for fully ported rectangular port heads.
I have brand new (virgin) 14011077 aluminum rectangular port heads that I am not planning on porting at this time.
If someone actully has the .flw file, that would be great, but, I can create the file if I know what the flow values are.

'69 ZZ502, Holley Commander 950 MPFI, Tremec T56, Dana 60
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post #2 of 10 (permalink) Old Dec 22nd, 04, 11:15 AM
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Get your 077s ported. They have problems from the factory. The 990 and the 077 are completely different heads. the 990 has a large intake runner and the stock (bad) exhaust port. The 077 has an intake port the same size as a Roval head and a very good exhaust port (for it's size). I have some max numbers on both heads done by the same gut but no midrange if you want them.
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post #3 of 10 (permalink) Old Dec 22nd, 04, 04:53 PM
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I have a file with the 990s. Send me an email.
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post #4 of 10 (permalink) Old Dec 22nd, 04, 06:07 PM
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what do u need to find the HP on desktop dyno?

69 Camaro RS 396bbc
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post #5 of 10 (permalink) Old Dec 22nd, 04, 09:28 PM Thread Starter
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Jamie Noble
 
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rpol78 - Sent you an email. Thanks in advance!

'69 ZZ502, Holley Commander 950 MPFI, Tremec T56, Dana 60
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post #6 of 10 (permalink) Old Dec 22nd, 04, 09:54 PM
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I have a set of 990 heads that I'm planning on putting on my 454 and would love to see an indication of what to expect. So if anybody has some numbers that would be great...
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post #7 of 10 (permalink) Old Dec 23rd, 04, 01:26 PM
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I have numbers for the 990s done by a very good professional porter
in ex
.250 190 151
.300 207 176
.400 260 212
.500 296 235
.600 324 241
.700 360 247
just for comparison I have the numbers at .700 for a set of 077s done by the same guy
in ex
372 281
As you can see the raised exhaust does make some serious difference.
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post #8 of 10 (permalink) Old Dec 23rd, 04, 04:45 PM
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Those are different than the numbers I have. The numbers I have are for stock heads I take it the numbers you have are for head that have been ported?

Lift IN EX
.050 32 24
.100 69 53
.200 125 103
.300 183 140
.400 233 176
.500 264 198
.600 292 204
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post #9 of 10 (permalink) Old Dec 23rd, 04, 05:10 PM
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My numbers came from the Chevy High Performance Database. The 990s are about halfway down the page on the first link. There's lots of other SB and BB heads listed in case your interested, just start with the "Database Main Page" link. Head Flow Database Link 990 Page Database Main Page .
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post #10 of 10 (permalink) Old Dec 24th, 04, 10:48 AM Thread Starter
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Jamie Noble
 
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Okay, I plugged in the values and re read the posts above. I thought that the 990's and the 077's were similar (with the exception of the 077's being aluminum).
Would anyone happen to have flow values for the 077's?

'69 ZZ502, Holley Commander 950 MPFI, Tremec T56, Dana 60
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