The 195cc AFRs areonly 195cc vs. 210cc for the Vortecs. Which one flows better? They are about the same in price except that the Vortecs require me to shell out another $400 for a base. I will be looking for over 420hp potential. Thanks!

 

Fow ratings are not a good indicator of the better head in this case. The AFRs will give decent torque, while the extremely large Vortechs (Who makes them?) would give better hp, but little torque, and higher up. The Afrs would make your 420 hp easily with a good combo.

 

WHAT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

The Vortec's & AFR's dont even compare!!!!!!!!

LOL!!!!!!!??????????????

Also GM MAKES THEM THEY ARE A FACTORY PRODUCTION CASTING (VORTEC HEAD)

 

Nevermind.....i thought you were talkin about the factory Vortec heads. Fastburns are a lil different LOL.

I am a moron!

 

An often overlooked aspect of head selection is chamber volume. Go with the one that will give you the compression you want with a flattop. The afrs are about 74 (or 68) cc out of the box and the GM fastbrns are 61.

either one will provide 430+ hp on a 350 (below 6000) with good hydroller (and about 10-1 comp)

 

Which one will be easier to reach my goal with?

 

Since no one answer your question _ Check out this link it has flow numbers for all kinds of different heads.
http://purplesagetradingpost.com/sum...fo/heads1.html
BUT this guy has pulled flow numbers from all over the place ( including manufacturers) so no independent testing. You could also check out
http://www.chevyhiperformance.com/
They have a pretty good flow database, but no fastburns though.
Basically the heads are pretty similar as far as power potential. I personally like the AFR's for more compatibility AND because they get the same flow with 20cc less intake volume which means greater velocity and wider power band (the fastburns claim to fame is really its' "fastburn" combustion chamber, which if you check many good aftermarket heads, including afr who has had similar designs for a while, have as well). If your only looking for 430 hp though there are lots of heads that will let you hit that mark for lots cheaper. Hell the regular vortecs will support that level of power, as will almost any stock iron head after a valve job and careful porting. The AFR's will support 500 hp naturally aspirated. Hope this helps.
John

 

I want alluminum heads though.

 

Have you determined what pistons ur using? what is the volume of valve relief/dish.

You don't want to end up with 11 to 1 comp with the FB heads because u used a flat top.
And most dish pistons are quite heavy (speedpro-trw-fm).

the difference in airflow in this range (about 20 cfm) will not be the determining factor in hp.

 

ttt

 

Well if you want aluminum heads, you've still got lotsa choices, the l98 aluminum heads will support the horsepower level your saying and are a lot less money, as are edlebrock or TFS. I'm just saying that for the horsepower level you mentioned your spending more money than you need to. If you want to go higher and you want a definitive answer use the AFR's. You can specify combustion chamber volume, you've got spring options, they don't have a funky intake port, and you can't beat their quality.

 

they will mill them to make the chamber you desire. Anywhere from 100 to 250 for angle mill.

 

I am shooting for 10:1 compression. What other alluminum heads are out there? If they are only like $200 cheaper then I would just rather get the AFR's. Leginfelter says that an alumminum vette head will only support around 450hp with porting.

 

If emissions legality is not a concern, check out Canfield aluminum heads. They are a bit cheaper than AFRs and flow almost as well, if not the same.

 

I looked at the canfields but they use a 2.05 valve on there 190cc head to acheive the same flow as AFR and this will hurt low RPM power.

 

Any one else have any opinions on either the Canfields, AFRs, or fastburns?

 

i'm personally not a canfield fan, but i do like the afr's and fast burns. the fastburn heads do require the more expensive intake with vortec bolt pattern/raised runners, but they will make for a better street head. the afr's will make for a better race head as they flow a bit more from the testing i've seen. the fastburn has a better chamber design for slightly better torque and in most cases are a bit cheaper. both will go well over the 420 hp mark without any problems.