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Discussion Starter · #1 ·
Intake
.100- 100cfm
.200- 175
.300- 244
.400- 283
.500- 295
.600-.297

I dont have the flow sheet here for my exhaust, but I flowed [email protected], and 238 with an exhaust tube bolted on.
I'd say I did a decent job considering I started at 216cfm, and I've barely opened the port entries larger than stock. I focused mainly on the bowls, and raising the roof of the port to re-align with my deepened valve pockets. The guy who flowed them seemed a little disappointed since I beat his work...badly I also gained 83 cfm at .400 lift.
Thanks God. I was worried there for a bit.
BTW, these are just '01 cobra heads with stock valves.
 

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Damn Brent, those mid range intake numbers are nice. Good job. Can you post your exhaust numbers?
 

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Discussion Starter · #4 ·
Thanks Andy. I was kinda shocked at the results, given I didnt open up the port entry much at all. I didnt think I was going to be able to reach 300cfm and still maintain velocity and strong low and mid lift numbers. Been giddy all night! I'll post the rest of the exhaust numbers tomorrow.
NX- I'll see if I can take some pics tomorrow and post.
 

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Discussion Starter · #5 ·
My exhaust flow numbers with a tube are:

.100- 78.5
.200- 133
.300- 183.5
.400- 222
.500- 239

W/O a tube, they're
.100- 75
.200- 124
.300- 166.5
.400- 192.5
.500- 206.5
He didnt flow them to .600
 

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For comparisons sake, here are 3 data points from my Navi heads (Fox Lake ported). These heads did have extra work to open up the bowls since they'll be on a big bore motor...

.300 lift: 250 intake 212 exhaust
.500 lift: 304 intake 228 exhaust
.550 lift: 306 intake 230 exhaust

stock bore plate, and no exhaust tube.
 

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Discussion Starter · #7 ·
Your low lift exhaust numbers are kick ass! I spent about 1/3 the time on the exhaust as I did the intake. Seeing your results, maybe I have more potential on my exhaust side. Then again, I'm not gunna run a blower, so maybe that's not what I want.
 

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Discussion Starter · #8 ·
The '03 cobra exhaust port flows an average of 141 cfm. Mine flow an average of 171. So, I'm already at overkill. Think I'll leave them alone.:eek:
 

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here are my TEA numbers for comparison

.1 91I 83E
.2 164 169
.3 225 221
.4 269 239
.5 292 249
.6 303 254

At least thats what the flow sheet says.
 

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Discussion Starter · #10 ·
ubeenbit said:
here are my TEA numbers for comparison

.1 91I 83E
.2 164 169
.3 225 221
.4 269 239
.5 292 249
.6 303 254

At least thats what the flow sheet says.
Cool. Looks like I beat TEA on the intake, everywhere under .6 lift. Are those heads going on a blower motor? The exhaust percentage is like 75% of the intake.
 

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they are on a blower motor. the problem i have is i dont have enough blower to really take advantage of them. my novi 1k is just gave out by the time they would really start to show. they did give me a completely flat torque curve from around 4800-7000rpm. it hits 400lb-ft and is a solid flatline till 7k.

i have tried several different combinations trying to get more out of the 1k. same story everytime. i hit 500rwhp and the hp curve flatlines till redline.

cant complain i guess 500rwhp on 11-12#s with a very small blower.
 

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Brent, thanks, I was impressed by them as well...until I saw the intake flow of a ported set of FR500s:jawdrop: I'm guessing you'll mate your 10" ported intake to those heads, but what cams? Do you think I have too much exhaust flow for 5.3L at 11:1 with .480+at the valve lift int/exh, and 235+ duration int/exh (slightly more on the exh.)? I'm using 1 3/4 to 1 7/8 stepped LTs to a 3" O/R Dr. Gas X through QMP 3" mufflers and dumps.

ubeenbit, what year heads/intake?

Thanks
Andy
 

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99 heads and intake

i had a short runner intake very similar to Brent's. I took it off because on my combo I didnt make as much torque through the power band. The intake moved it up above what my 1k could supply for air.

Jason
 

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Discussion Starter · #15 ·
Fourcam322 said:
Brent, thanks, I was impressed by them as well...until I saw the intake flow of a ported set of FR500s:jawdrop: I'm guessing you'll mate your 10" ported intake to those heads, but what cams? Do you think I have too much exhaust flow for 5.3L at 11:1 with .480+at the valve lift int/exh, and 235+ duration int/exh (slightly more on the exh.)? I'm using 1 3/4 to 1 7/8 stepped LTs to a 3" O/R Dr. Gas X through QMP 3" mufflers and dumps.

ubeenbit, what year heads/intake?

Thanks
Andy
I think Al would be the best source of advise there, but your combo is definetely more suited to those exhaust flow numbers than mine. Yeah, I had my 10 inch runner intake in mind, but you never know what can happen by then. Maybe I'll get my old 6 inch runner back from Joey and try that. I'll probably try my ported fix stock intake as well. I'm looking for the strongest powerband across the board, like from 3500-7000. I'm not totally sure on the cams yet, but the ones i'm aiming toward are pretty mild, and I should still be able to pass smog with them. Crane regrinds, [email protected] and .450 lift. I think that since I'm shooting to keep dynamic compression high in a useful range, I wont see awesome peak numbers, but I dont give a damn about that really. I think there will be enough in my combo to hit 350rwhp with a tune, though. Wish someone could desktop dyno this combo for me and compare it to my current combo. :hint: :hint: ;)
 

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I did not see anyone list numbers for a set of race ported B heads so here are mine for camparison

All Port work was done by Charles Rogers at Heads Up Performance. The heads still have the stock valves and were flowed with a stock bore and no exhaust

Intake
.100 113.9
.200 180.4
.300 222.0
.400 278.1
.500 326.4
.550 343.8

Exhaust
.100 98.1
.200 144.2
.300 208.1
.400 233.0
.500 237.9
.550 242.6
 

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Discussion Starter · #17 ·
Great numbers. Those B heads sure do flow.
 

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For comparison, my ported 96-98 style stock heads do [email protected] lft. I cant' remember the other data points and I've lost the sheet on it, but it's clear from the numbers you've got that there is a benefit of the 99+ heads.
 

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Discussion Starter · #19 ·
ViperRed96GT said:
I did not see anyone list numbers for a set of race ported B heads so here are mine for camparison

All Port work was done by Charles Rogers at Heads Up Performance. The heads still have the stock valves and were flowed with a stock bore and no exhaust

Intake
.100 113.9
.200 180.4
.300 222.0
.400 278.1
.500 326.4
.550 343.8

Exhaust
.100 98.1
.200 144.2
.300 208.1
.400 233.0
.500 237.9
.550 242.6
BTW, were those the numbers he got on his flowbench by any chance? The low lift and high lift flow numbers dont seem to match. With that kind of flow at high lift, it just doesnt seem they should flow that much at low lift, especially with these heads being the low velocity B heads.
 

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The ported B heads are used on a blower car correct? Those are great flow numbers, but you really can't port B heads at all without losing substantial velocity.
 
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