ddnspider

iTrader: (26)

I recently got my heads finished and thought id do a comparision on how they flow compared to other heads....but its tough going from 1 sponsor site to the next to check flow numbers.I did a search in here and only came up with 1 page that showed a collective flow sheet of about 10-12 companies.And i thought a mod has an excel sheet too but couldnt find that.So i thought itd be cool if everyone posted their flow numbers,type of heads,company, sizes and what not.Then I can make a nice big table so others can look at the diff companies and see the differences.Just post up what you have and what they flow.Nick

Tony Mamo @ AFR

iTrader: (13)

"Advertised" numbers are usually just that....advertised flow numbers.

Independent testing is a must and if your going to round up comparitive data on a group of heads, they MUST be flowed on the same flow equipment with the same fixtures, opening tools, radiused entry for repeatability, flow pipe (the same) on the exhaust, etc. If not it is really just a pointless exercise IMO assuming you really want to compare data).

I just flowed a reworked, expensive "STG III" 243 casting and I'm quite sure the "advertised" numbers weren't even close (230 cc port only mustered 294 Int. CFM's / 200 on the exhaust WITH a pipe).

I also recently flowed another CNC head that was a very good flowing piece....I might add both of these to the "Flow Thread" I started propbably a year or so ago.

Just my .02 of course which you can call BS on or whatever you like

Patrick G

iTrader: (14)

As long as all the heads are flowed on the same bench using the same test procedures, the info would be wonderful. Thunder Racing has several years worth of info with heads they've flow on their SF 1020 bench. In the past 3 years, they've only had about 6 heads exceed 300 cfm on a 3.900" bore. Happily, my small bore AFR 225s were one of them. Bottom line, don't trust all companies advertised numbers. Some are accurate (like AFR and ETP), others are very optimistic. Let the buyer beware.

xfactor_pitbulls

iTrader: (16)

Thats pathetic. Some of the stuff I have seen in person has dropped anywhere from 5-15cfm from what was advertised. TEA has been dead on the intake, and that crazy 270cfm or whatever with a pipe stuff has been around 215cfm exhaust for 241 castings. ET actually flowed better than what they said by a few cfm. I think the exhaust numbers are actually the ones that are cheated on most nowadays. You would think that the intake would be harder to get flowing, but its really the hot side.

Brandon

xfactor_pitbulls

iTrader: (16)

Patrick, it isnt that hard to exceed 300 cfm on a 3.90 bore. I will have to send you one of the next 243 heads I finish.

Brandon

gollum

iTrader: (1)

How do you check the quality of air flow. This question is over most everybodies head except a few. Tony?

Patrick G

iTrader: (14)

Brandon, my comment was specifically aimed toward exceeding 300 cfm on Thunder's SF 1020. For whatever reason, their bench flows way below most other people's SF 600s. FWIW, my milled AFR 225s flowed 316 on AFR's SF 600, but only 310 on Thunder's bench. Any head that flows over 300 cfm by .600 on Thunder's bench usually makes killer power.

ddnspider

iTrader: (26)

I wasnt asking for Advertised airflow numbers.....i did use them to compare but id obviously prefer personal numbers.Thats why i said included if u can how the flowing was done.I think itd be a good way to compare values to see what your heads do.For example i thought by flow numbers werent so great til i compared them to others personal and advertised numbers...and realized that peak flow numbers dont tell the whole story.

ddnspider

iTrader: (26)

ttt fellas post up

strokedls1

iTrader: (1)

ARE stage 2 5.3L castings with 2.055 intake and 1.60 exhaust with valve job by WCCH
Flowed at wcch with 4.060" @ 28
Intake 232cc with radius entry
.100 79.2
.200 155.2
.300 211.3
.400 253.3
.500 285.5
.600 309.6
.625 312.4

Exhaust 89cc with pipe
.100 70.6
.200 123
.300 169.1
.400 204.8
.500 225.9
.600 236.4
.625 238.8

ddnspider

iTrader: (26)

were goiong to need more than 1 fellas.....Tony Mamo has a nice thread but he didnt put the sponsors names that did the heads whereas id like to.

xfactor_pitbulls

iTrader: (16)

Losing 6 cfm up top isnt that much. I seriously doubt their bench would knock a 318cfm head down past 300cfm

Brandon

Dart331Stroker

Its not just their 1020 ours also reads lower, by about 10-20cfm depending on port volume and bore sizes. We always test with both a Superflow 1020 and a Superflow 600, we also use our Superflow wet flow bench, but the numbers are totally different as we test over 60" of water.


I also agree with Tony@AFR if there is any comparison they need to be the same benches and the same circumstances. I would also like to see the same for dyno testing, use the same runner, valves sizes, and chamber sizes when comparisons are done. Another thing I would like to see when people do these test, use the valves the company who made the parts uses, we work hard developing a port, and valve job, and then they shove some valve in the head that kills the port by 10+cfm, use the valve the head was built for.. or at least one comparable. All too often when comparisons are done chamber sizes are different, and valves sizes are not the same. Side by side back to back comparisons are nice. The problem is with these types of test, the time is money thing comes into play, nobody will donate the time it takes to test all of these heads against each other.

John

Dart Machinery Ltd.

JRracing

iTrader: (35)

I just got back my 5.3's from TEA. They are an older used set I got off of here. 2.02 int/ 1.55 ext valves. I guess they would be like stg 1.5 porting.
Here's what they did on there bench. They are milled .050".
int ext
.100 67 / 56
.200 138 / 109
.300 200 / 158
.400 247 / 205
.500 285 / 238
.550 296 / 250
.600 295 / 258

How do they compair with other 5.3's? This sounds pretty decent to me!

Jason 98 TA

iTrader: (4)

I've had older versions of the PRC heads well over 300cfm on Thunder's bench so I guess I can get in on this discussion.
Let me throw a little more fuel on this fire... I have a set of 215 ET heads that flowed under 300cfm & were claimed to be 320 on the site. I've also never seen a AFR 205 head go over 295 cfm on our bench. Would you guys like me to get some extra data for you?

As always if anyone is in the area feel free to come by & I will flow any cylinder heads we have in stock!

just-a-z

iTrader: (25)

hell yes we want more info Jason!

xfactor_pitbulls

iTrader: (16)

Sound like some real life numbers. I still would like to see the exhaust without a pipe. Those should make some good power.

Brandon

slt200mph

iTrader: (42)

to the top

ddnspider

iTrader: (26)

everybody post up!!im adding to the excel sheet each time someone posts some numbers.Lets see what you got.And maybe if xfactor_pitbulls, Jason 98 TA, JRracing, or other sponsors dont mind;subscribe to this thread and people who post up flow numbers can have them critiqued from people with experience.

RAMPANT

iTrader: (17)

My AllPro's, here were the flow numbers from mine.

They have REV valves, 2.08 int, 1.60 exh. With a 4.100 bore.

Lift Intake Exhaust/ no pipe
.200 160 125
.300 219 160
.350 242 171
.400 263 180
.450 283 190
.500 303 200
.550 321 209
.600 335 215
.630 347 221 (235 with pipe)

Brian at ARE did them.

Not sure if this helps any.

Rampant


(found out it was a 4.100 bore)