mike c.

iTrader: (1)

ok...car is a 01 ws6 m6,348ci,4.11's 12bolt with kooks and all the boltons. i will be using the g5x3 cam and will be loosing my ported heads for a different set. i will give you the heads and flow#'s. i am having a real hard time choosing what heads will give me the most power and handle daily driving.
head #1 afr 205 / head #2 afr 225 / head #3 et perfprmance/ap engineering5.3
. in . ex . / .in . ex . / . in . ex . ... lift on all.
140 . 112 / 150 . 120 / 162 . 115 . .200
200 . 170 / 220 . 178 / 209 . 154 . .300
251 . 203 / 266 . 220 / 265 . 187 . .400
281 . 221 / 304 . 241 / 297 . 209 . .500
292 . 226 / 313 . 246 / 309 . 214 . .550
298 . 230 / 320 . 250 / 320 . 222 . .600
val. .
2.02 1.60 / 2.08 1.60 / 2.05 1.57
all three heads look nice but, i didn't want to give the name of the heads because i don't want people to choose because of the neme brand. it seems that the AFR head favors exhause flow but the 225 head has valves that may be too large 2.08. the 5.3 liter head from ET seems to flow as good as the 225 in the IN. but a little less in the EX. then the 205 head . my car is a street car and i'm looking for the most power that a street car can take as a daily. I WOULD LIKE INPUT FROM ONLY PEOPLE WHO HAVE A CLUE NOT FROM THOSE WHO HAVE NO IDEA. thanks, mike c.

mike c.

iTrader: (1)

what the hell happened? when i typed it all out all the #'s were spaced out.

mike c.

iTrader: (1)

it's alot easier to read now.

J-Rod

The software removes the spaces.

In regards to your question. Keep in mind that LG is using AFR's exclusively with his in house packages.

Keep in mind that while flow numbers SHOULD be consistent, unless they are flowed on the same bench by the same operator, the numbers from different shops need to be taken with a grain of salt.

Only look at those numbers as a trend on the head, and not an absolute... Its the same with dynos or anything else.

I'd look at the AFR 205 head as it is avaliable. The 225's are avaliable as a big chamber only, so you'll have top wait for the smaller chamber heads, unless you don't mind loosing power because of compression loss.

I've heard Chris and AP make nice stuff, but I haven't seen their heads on a bench. So, I can't make a recommendation on them. It not that there is anything wrong with them.

I've seen the AFR's so to me they are a known quantity.

MUSTANGEATER

iTrader: (10)

I'd go for an LS6 or AFR casting porting by Meaux (Furtal's porter) or an out of the box 205 with some angle milling

technical

I would stay with 5.7 castings either LS6 or the AFR's. I've seen some strange tq curves with the 5.3's on a 346ci.

Nate_Taufer

iTrader: (1)

Have you flycut your pistons? I believe with the 5.3's and the 225's you'll have to flycut. I would say go for the 205's as cast and have your fave head porter go to town.
Nate

PREDATOR-Z

G5X3 is LG cam, so call LOU and have him spec you a set of heads for this cam.
The reason also being that no one really knows the full specs on a G5X3 except LOU and his son (and a handfull of discreet poeple)

mike c.

iTrader: (1)

i'm using the g5x2 cam now,lou said the x3 cam is only slightly larger. TAUFERN-my block is a 348ci with flat tops and valve reliefs in them,i also have a forged rotating assem. my car has went 11.4's on motor and 10's on a 75 shot,i'm looking to drop 3 to 4 tenths more on motor. this is why i'm in the market for a new head and cam set up. with so many heads out it's not easy to know the best for my set up. to me it looks like the et/ap head or the afr head would do it. TECHINAL-strange tq curbs with the 5.3's,interesting tip, thank's.J-ROD-that is a great point. the AFR head is known and lou(LG)told me his head/cam had the higest hp dyno that ap engineering had on their stang dyno of 420ish hp. man,i'm stuck.

J-Rod

I'd look at waiting for 225's since you are looking at more of a max effort car. Unless you need to do it right now, wait just a bit...

mike c.

iTrader: (1)

i'm looking to do this around late march first april. is the 225's 2.08 valves too big for a 348ci??

DavidNJ

Pick a power level. Then do you comparison. The last head is much smaller on exhaust numbers. The cam spec'd is slightly bigger on exhaust and used with the AFR by LG. I have heard of other ported heads using a much bigger exhaust split.

If you have a stock bottom end, you won't go over 7k. The cam is not that big. I believe both LG and AFR would tell you the 225 is too big. And that the 225 must have a big bore to unshroud the valves.

Answer:
AFR 205, milled to maintain compression, with 921 springs and new 'R' 875 lifters, and new pushrods (you may need a different length). LG sells the head milled (an AFR option I believe) with the 921s (also and AFR option).

You may have to flycut the pistons even with the 205 (after it is milled). I believe LG provides the equipment to do that.

Mike K.

hmmm I know I would choose an afr head but which one is the question...

KKu77

Can you expand on that a little? I'm thinking about getting 5.3 heads...

Nate_Taufer

iTrader: (1)

Choose the as cast version as both the 205 and 225 both start from the same casting. Then the cnc program goes to town in different ways for the two different heads. I would send a set of the 180cc as cast versions to LG Motorsports and have Lou's boys port em or send em to TEA with the cam card (if they give you one) as a properly matched set of heads will perform a lot better than just cnc'c 225's and probably cost about the same price.

If it were my car I would get a set of Keith Craft motorsports ported AFR heads. Then have the flow sheet sent to a custom cam grinder and go that way. Seems like you are going about this a little backwards. Maybe Vinci could hook you up or you could have Keith Craft reccommend something.

Nate

mike c.

iTrader: (1)

i'm going with the AFR head's and the x3 cam from LG. thanks all. mike c.