Anybody upgraded to these from their old afr 227 or 210 version? My friend just received a set and I talked him into letting a local buider flow test them. afr says 335cfm @.600 and they only went 301@.600 lift. I'm not bashing AFR, I run a set myself, just seeing if anybody has seen performance gains at the track.

sorry afr's website says 324@600 and 334@700....his went 301@600 and 311@700..any timeslip data? thanks.

I've seen the same thing here with that product. And I worry about 5 cfm..

Diffrent flow benchs are like dyno's each one is diffrent, and bore size, valve size and correction factor will have an affect on final #'s

My experience.

66 Chevy II 434 cid went from 9.70's to 9.60's with change from 227 to 235 CNC AFR heads. This was done along with a freshen up with new rings etc. Also changed from Comp rockers and stud girdle to Jesel shaft system so I'm sure that was worth some HP too. A bigger engine will probably show more gain than a smaller cu in motor.

Gotta use same bench and setup on both sets of heads for a real CFM comparison.

For what it is worth, I recently purchased a set of AFR 227 comp eliminators and had them flowed on a 3rd party flowbench. (Faerman racing in Houston)

The below are the results:

Intake:

Lift..........actual
.200..........154
.300..........208
.400..........264
.500..........304
.600..........325
.650..........325


Exhaust:

Lift.....advertised
.200..........114
.300..........165
.400..........205
.500..........223
.600..........232
.650..........236
( No exh pipe used)

I was pretty happy, the flow #'s were a little off the advertised at the low lifts, but a little high at the higher lifts..... not bad for a $ 2k off the shelf set of heads.

I know a "lot" of the late model guys buy and then flow the AFR 195's, and they are definitely getting the advertised flow #'s on independant bench's..... but I do not know much about how other 210's and 227's have done, I haven't seen a lot of results with them, although I haven't looked for them either.... suppose other results are out there, but do not know.

Probably better heads out there in the world, but for an off the shelf head that is typically $ 1400-2100 dependant on which head you chose, they're tough puppies to beat.

On another note, I know the guy who got the 2nd set of AFR 235's (right after Sherman got his), and his flowed right around 340 cfm on an independant bench.....

quote:

Originally posted by HR3377:
Diffrent flow benchs are like dyno's each one is diffrent, and bore size, valve size and correction factor will have an affect on final #'s

Same propaganda AFR puts out and it's horse feathers. at least 5 benches have tested these heads and all of them have come up with the same conclusion.

Tony Mamo told my friend they spot check and flow
about every third head out of production. Tony said he would flow these heads if my buddy paid for the freight. I just can't believe afr's flow bench is so much more optimistic than out local Lubbock tx engine builder's bench. My buddy currently runs the 100% CBC 227 afr and was all but promised more than .10th faster times when ordered. Thanks for your comparisons.

quote:

Originally posted by Scott Smith:

quote:

Originally posted by HR3377:
Diffrent flow benchs are like dyno's each one is diffrent, and bore size, valve size and correction factor will have an affect on final #'s

Same propaganda AFR puts out and it's horse feathers. at least 5 benches have tested these heads and all of them have come up with the same conclusion.

totally agree! I'll guarantee my CNC heads will flow BETTER than advertised! That is how you do it.

These subject is a can of worms and no one wins. Some facts to consider.

Head company's know big numbers sell heads.
They obviously post their best head flow numbers which are most likely the final prototype head. Sacrifices are made during production so flow suffers.
And as mention all flow benches are not created equal or even used correctly along with a host of other variables
When all is said an done all that really matters is how they perform on the track, the time slip doesn't lie! So educated yourself before you spend the dollars.

quote:

Originally posted by Chad Speier:
totally agree! I'll guarantee my CNC heads will flow BETTER than advertised! That is how you do it.

Not to mention, flow CORRECTLY, and better than the flow #'s show...

I'll agree with some of what has been said, however ethics are important also. I don't buy the flowbench blah blah blah..

23 cfm is far more than a bench or an operator or a production flaw. If you advertise it, you OWE it to the people spending their money.

This is a never ending debate that is easier to let slide than change.

my opinion...

Ok my buddy is going to take off his current 227 head and have it flowed on the same bench next week. That should be an aba test.

Yall need to look at the new Profiler Air Wolf. It has those flow numbers at 220cc

Speaking of the air wolf. Chad, are those heads 220 before or after porting?

Scott

quote:

Originally posted by 358T:
Speaking of the air wolf. Chad, are those heads 220 before or after porting?

Scott

after, they start out as a 195cc. The 245cc port is the same core. Tells you how much meat that core has!

OK, my buddy took off his heads from his motor to have flowed on the same benchm to comare apples to apples. They are '02 year model AFR 227 100% cnc from afr. AFR advertised like 295@.600 and 304@.700....Yesterday on the same bench that his new 235's were flowed went 280@600 and 278@.700....It looks like they backed up a bit and this local flow bench is very very stingy and conservative. Apples to apples I think he will see a couple of tenth faster at the track. He currently runs 10.30's to 10.40's....

quote:

Originally posted by 72nova:
OK, my buddy took off his heads from his motor to have flowed on the same benchm to comare apples to apples. They are '02 year model AFR 227 100% cnc from afr. AFR advertised like 295@.600 and 304@.700....Yesterday on the same bench that his new 235's were flowed went 280@600 and 278@.700....It looks like they backed up a bit and this local flow bench is very very stingy and conservative. Apples to apples I think he will see a couple of tenth faster at the track. He currently runs 10.30's to 10.40's....

The other thing to consider is the valve job. I have seen heads loose 20 cfm going from a great valve job to a good one. I have seen a 434 18 degree headed motor loose over 2 tenths from a 'valve job'.

ok my buddy ran his 66 nova this past weekend at Abilene's 1/8 mile track. As far as we can tell, he had less than a tenth improvement with the new 235's vs his older 100% cnc 227's.

I have a set of 210s with the first cut CNC.($1500) Enough hp to put the 3200# car 10.53 @127 with stock suspension 10"wide(actual) tire. 9.8:1 383 with a cheap QFT750 carb. Couldnt be happier.