i'm looking for a set of heads for my 477 bbc,have anyone use afr bbc heads and made good power ,are they good or bad
1/4 dragstrip

Originally posted by boarhunter:
i'm looking for a set of heads for my 477 bbc,have anyone use afr bbc heads and made good power ,are they good or bad
1/4 dragstrip =
I honestly don't think you are going to find a better conventional out of the box BB head out there.
Anyone who has flowed or used these heads has been pretty impressed.
I have said this before but Tony did a hell of a job designing these graemlins/thumbsup.gif

If you are considering a set email me & I can probably save you a few dollars on them.
;)

do you know anyone running afr's and what type of power are they making.i have a 13to1 solid roller 750/730 lift 285/289 with a 5500 stall in a 3300lbs car with 400 trans 4.10 gear 28.0 inch tires ,trying to see mid nines with 345's

Mike......how are comparable AFR'S comparing to a Dart PRO 1,say 325's, out of the box up to about .750" And then both in full port config. I'd heard the Darts aren't that glamorous out of the box but i'm not convinced of that either :cool:

Joe,
In my opinion, no comparison. The AFR 325, with the CNC chamber will go about 400 honest CFM & the out of the box 325 as cast will go 380
If you compare the low & mid numbers to any other head out there the AFR will kill it.
I have flowed a few AFR's & can tell you that the numbers they post are very honest as are Brodix's. In fact I find most of Brodix stuff to be pretty conservative but they use a 4.250 adapter vs AFR's 4.600.
I don't know if you saw Ken's post but the numbers for a 315 AFR's I flowed are here (measured, not advertised) & also Ken's thoughts on the AFR 357's from his friend with the bench are here;

Canfield flow numbers (http://www.chevelles.com/forum/ultimatebb.php/topic/4/23198.html)

boarhunter,
If you give Tony at AFR a call (818-890-0616) I am sure he will be glad to give you a list of a bunch of people running the heads to contact.
He is also very cool people & a wealth of information. Tell him I told you to bug him ;)

I used a set of 315 full CNC one's on a 9.8 compression 489 & the results were pretty impressive. Here is the info I have posted before.

AFR 315, Vic Jr, 1"spacer 850 Demon, Comp roller 254/260- .698/.666-111 sep, Isky Red Zones, 10.0 compression, 2" dyno headers
670HP@ 6300 @ 610tt lbs @ about 45-4600.
Over 500 ft lbs from 2900.
Idled about 850, don't remember the vacuum
This was on a dyno considered pretty conservative,,, Mine :D
Also this engine was pulling over 2" of vacuum from around 5000 on up which means the carb was too small.
Add about 1 point of compression and a little more carb & I have no doubt it would have gone over 700 honest HP.

This engine was originally built with a Comp hyd roller that broke a link bar on the fifth dyno pull. (needless to say I do not use Comps rollers any more!!)
It made the same 610 lbs ft but the Hp was 620 at about 5900
=====
It went into an original 375HP 66 Chevelle SS 4speed car that was about 3600-3700lbs or so with driver. I think it had 3.73's, possibly 4.11's

Strictly a street car but he ran it once & was "politely" asked to leave. It ran one "good" pass of 10,98 at 131 something (never mind the other passes :D )just smoking the crap out of the tires!!
No roll bar, just a seat belt,, they were not real happy with him.

If nothing else, it pretty much verified my dyno numbers though :D

boarhunter,
335 AFRs on my 540 made over 830 hp. 700ft lbs torque. (probably mid 840 hp if I would have spun it higher) 12.5 to 1 and a cam smaller than your running. Very streetable. I'm over here in Dart country and my engine builder was pushin Brodix on me, but I stuck with the AFRs. Everyone was impressed with the AFRs!! Performance and Quaility! graemlins/thumbsup.gif

Ok....thanks Mike......it sure sounds like if I were starting from scratch the AFR'S are a no brainer.....none the less if the Dart and AFR were both ported by a reputable porter I'd sure like to see dyno or strip testing and they would both be the same port volume out of the box naturally. It would be interesting to see how good low and mid lift numbers make a big difference :cool:

Originally posted by joespanova:
Ok....thanks Mike......it sure sounds like if I were starting from scratch the AFR'S are a no brainer.....none the less if the Dart and AFR were both ported by a reputable porter I'd sure like to see dyno or strip testing and they would both be the same port volume out of the box naturally. It would be interesting to see how good low and mid lift numbers make a big difference :cool: Joe,
The 335's Nick posted above are the full CNC ported 325's & you will be hard pressed to find even a well ported head that will compare to these as they come right out of the box.

Nothing against the other heads as they have been shown to be capable of excellent power in the right hands but as I have posted before, Tony has done his homework with these heads & they flat make power.
I highly doubt you will find a head in the same price range that will beat it ;)
Oh, to your question about low & mid numbers,,, ALL THE NUMBERS ARE IMPORTANT especially numbers that are seen twice :D
The only numbers that mean nothing are things like +700 stuff if you are running a .650 lift cam,, great for bragging about but if the cylinder doesn't see them they don't mean squat ;)

wolf what do you think of the afr 345's on a 477 or would it be better on a 496 13 to 1 .I seen these 345's on ebay new for 1900.00 and from what i heard there good and my cam is a 750/730 solid roller from cam motions so maybe i can pull to 7500 with these heads, just kicking these around because i'm trying to build 800hp motor to run mid 9's in 3300 lbs car.any one have any combo's for a 496 around 800 hp

Originally posted by boarhunter:
wolf what do you think of the afr 345's on a 477 or would it be better on a 496 13 to 1 .I seen these 345's on ebay new for 1900.00 and from what i heard there good and my cam is a 750/730 solid roller from cam motions so maybe i can pull to 7500 with these heads, just kicking these around because i'm trying to build 800hp motor to run mid 9's in 3300 lbs car.any one have any combo's for a 496 around 800 hp The 345's are going to be pretty big on a 477 unless you are planning on spinning the crap out of it & running a cam with at least .800 lift :D

And again, before you run out & buy a set off of ebay you might want to email me.
As I said earler, I have pretty good pricing on them. ;)