My ARE flow sheet for 5.3 heads
Thread Starter
On The Tree
Joined: Mar 2002
Posts: 196
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From: N. KY
My ARE flow sheet for 5.3 heads these are stage 1 heads i ordered in april of this year. nick was suppost to send me these like 3 times but i gave up. i talked to barry the other day & he told me he would take care of it, & he did.the compression is ll.1:1. i am very happy with the heads. i will try to get some pics up in the next day via my brother, he has a scanner. these heads were not hogged out at all. they didn't even look like they were ported much so i am sure they have good volocity in the ports.these heads have 2.02int.1.57ex. valves with comp 918 springs
lift int ex.
200 133 107
300 192 142
350 218 156
400 237 169
450 255 180
500 270 190
550 284 194
600 295 203
lift int ex.
200 133 107
300 192 142
350 218 156
400 237 169
450 255 180
500 270 190
550 284 194
600 295 203
SSU Moderator
Joined: Nov 2001
Posts: 4,857
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From: Austin, TX
Re: My ARE flow sheet for 5.3 heads you'll gain some with a split duration. you're looking at about 68% separation between intake and exhaust at .550. its the same at .600. Also, they look about 20cfm down (on the intake at least, i dont have the exhaust numbers handy) to comparable heads from a different porter.
just though I'd share (no bashing here, just info). Some GTP's I've seen have had similar figures, while some old MMS heads were up around 75%. Stock is close to 82%.
still, what flow numbers wont show...is velocity.
Ryan
<small>[ October 03, 2002, 11:30 PM: Message edited by: Ryan ]</small>
just though I'd share (no bashing here, just info). Some GTP's I've seen have had similar figures, while some old MMS heads were up around 75%. Stock is close to 82%.
still, what flow numbers wont show...is velocity.
Ryan
<small>[ October 03, 2002, 11:30 PM: Message edited by: Ryan ]</small>
TECH Senior Member
Joined: Nov 2001
Posts: 10,341
Likes: 1
Re: My ARE flow sheet for 5.3 heads Bench to Bench comparision is pretty meaningless though Ryan.
One guy had his MTI heads flowed at a different place and they went from the ~307cfm MTI proposed to just over 290cfm that he saw on the bench.
Was MTI lying? NO but benchs read different values. So much for these expensive flowbenchs them reading exactly the same between machines. LOL!
You will see this with all the major sponsors. It isnt the porter but differences between the flow benches. Just like you see variance between dyno numbers at different locations. Two heads flowed on the same bench on the same day will give a better representation.
Cheers,
Chris
<small>[ October 04, 2002, 07:24 AM: Message edited by: Chris ARE 360 ]</small>
One guy had his MTI heads flowed at a different place and they went from the ~307cfm MTI proposed to just over 290cfm that he saw on the bench.
Was MTI lying? NO but benchs read different values. So much for these expensive flowbenchs them reading exactly the same between machines. LOL!
You will see this with all the major sponsors. It isnt the porter but differences between the flow benches. Just like you see variance between dyno numbers at different locations. Two heads flowed on the same bench on the same day will give a better representation.
Cheers,
Chris
<small>[ October 04, 2002, 07:24 AM: Message edited by: Chris ARE 360 ]</small>
SSU Moderator
Joined: Nov 2001
Posts: 4,857
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From: Austin, TX
Re: My ARE flow sheet for 5.3 heads Chris. fine, write it off to flow bench differences. either way, the percentages dont lie. that comes straight from the number that he posts on that ONE dyno.
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SSU Moderator
Joined: Nov 2001
Posts: 4,857
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From: Austin, TX
Re: My ARE flow sheet for 5.3 heads WTF!!! i just re-read the thread. you JUST posted your flow numbers. <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" />
so if you post your numbers it correlates something or validates ARE...but if i say they are 20cfm low...ITS A DIFFERENT FLOW BENCH!!! BS!
you flowed your **** on a different bench as well, so edit your post or STFU.
so if you post your numbers it correlates something or validates ARE...but if i say they are 20cfm low...ITS A DIFFERENT FLOW BENCH!!! BS!
you flowed your **** on a different bench as well, so edit your post or STFU.
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Brett Foote TECH Senior Member
Joined: Nov 2001
Posts: 10,341
Likes: 1
Re: My ARE flow sheet for 5.3 heads What are you talking about?
His stuff was flowed on AREs bench wasnt it?
That is where mine was flowed as well <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
I dont understand (unless his was flowed on a different bench)
Chris
His stuff was flowed on AREs bench wasnt it?
That is where mine was flowed as well <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
I dont understand (unless his was flowed on a different bench)
Chris
SSU Moderator
Joined: Nov 2001
Posts: 4,857
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From: Austin, TX
Re: My ARE flow sheet for 5.3 heads hell i dont know. its early.
anyway. the percentages are straight from the numbers he posted. less than 70% tells me to crutch the exhaust side of the motor. just an observation from some recent ARE heads.
again, numbers dont mean ****. velocity is key.
anyway. the percentages are straight from the numbers he posted. less than 70% tells me to crutch the exhaust side of the motor. just an observation from some recent ARE heads.
again, numbers dont mean ****. velocity is key.
Thread Starter
On The Tree
Joined: Mar 2002
Posts: 196
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From: N. KY
Re: My ARE flow sheet for 5.3 heads you two crack me up <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" /> , anyway bare with me i am trying to dig up the pics of the porting on the heads,they are in the house somewhere. i will get them up.keep in mind these are stage 1 heads not stage 2-3. i may need another cam i don't disagree with that & i thank you Ryan for the help,i am always looking to go faster & i do appreciate it. it feels strong now with the T1 cam which i like. i have a friend with a similar set that ran 11.4's with 3600lbs raceweight; but he had tuning, skinnies, & good clutch. i trapped at 115mph with a passenger with around a 3750-3850 raceweight(counting the passenger) at a corvette meet in 95 degree weather & high humidity.i have it on 8mm film but don't know how to post the vid. on the comp/net or i would.my clutch sucks so bad it will not even catch now with a 3k dump on F1's if it is warm(clutch) at all so i was only getting crappy 1.85ish 60times. i plan to tune it here shortly on a dyno with ls1 edit. barry from ARE told me if i am not happy with my numbers call back & he would let me talk to wade about another cam, but told me to tune it & dyno it first.he said the T1 was a good cam,which made me feel good that he would not bash a competitor, which told me he was honest.i hope with a clutch,skinnies,tuning, & dropping the raceweight to around 3400-3450lbs,& maybe a set of drag shocks i should see mid to low 11's with good weather.i may spray a small shot after that to get the car in the 10's if the engine holds up.
TECH Fanatic
Joined: Feb 2002
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From: New Jersey
Re: My ARE flow sheet for 5.3 heads I think I have a good idea of how to get every shops flow bench to read what flow values are truely being found. All shops should take an 853 casting head bone stock and flow it from .100 to .500 using GM's stock flow numbers as a reference, then someone can post all results and create a data base for flow comparison from shop to shop. OR, mail one head around the country, and have all the shops flow itand post the results. Some other meaningfull criteria would be what make / model bench and of course at 28'. is this a good idea?
Joe.
Joe.
TECH Fanatic
Joined: Feb 2002
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From: New Jersey
Re: My ARE flow sheet for 5.3 heads Okay BADZ,
Do you think it's a good idea that all the flow numbers should be e-mail in from the participating shops to someone like you and posted when all the shops have checked in? and would you coordinate this? I feel that if there is a data base made up, it would be a great asset to see how one shops heads flow directly compared to another, then we would have a true Benchmark.
Joe.
Do you think it's a good idea that all the flow numbers should be e-mail in from the participating shops to someone like you and posted when all the shops have checked in? and would you coordinate this? I feel that if there is a data base made up, it would be a great asset to see how one shops heads flow directly compared to another, then we would have a true Benchmark.
Joe.
