bigblockquad

Did a quick search and can't seem to find what I'm looking for. Can anybody post flow numbers of either head or point me in the right direction? Flowing 300+CFM would be nice but I'm more interested the best numbers across the board.

TIA
Rich.

Phil'sC5vette

iTrader: (4)

AFR numbers are on their web site and several time on this forum.

I dont hear about to many people with GMPP. I think they cost a little less than AFR.

You cant go wrong with the AFR 205s

bigblockquad

Thanks Phil,

I finally got the right page to load showing AFR 205 LS1 flow #'s. For some reason when I did it before all I got was an AFR 315 comparison test dated 2001.

Does anybody have flow numbers on the GMPP LS6 ported heads. I think they're a little better at peak but that might not mean much if they don't flow well across the board.

Later
Rich.

tim99ws6

iTrader: (31)

i do. i'll have to see if i can dig them up though..... these are the GMPP specs....these are not my specific specs, but are extremly similiar to mine
Int. Exh.
200 150 117
300 225 168
400 273 202
450 285 210
500 291 217
550 304 221
600 311 222

xfactor_pitbulls

iTrader: (16)

That is some sick midlift flow. Jesus! Do you know what the valve job angles and valve back cut are?

Brandon

tim99ws6

iTrader: (31)

no clue. Mine were flowing within 5-10cfm of those heads, and all i did was change springs, and mill them for more compression. I was amazed at what they flowed with such little work being done to them. I could care less about 600+lift, i'll take my mid range lift all day. Honestly, these are the only set of heads i'd consider running over a AFR head.

JS

iTrader: (4)

They are a good head,however 250CC runner seems alittle bit portly..I think the right type of cam will shine with those GM heads but again I'd look at the ET 215's before the GM LINGI heads...

SAM98WS6

Id double check that...I saw flow numbers somewhere on here that were nowhere close to this...

66deuce

iTrader: (1)

i don't know the angles,but i had LPE do some work on my 5.3 heads (valve job,CNC the comb.chambers,bowl blend,etc.)and my low-midlift flow numbers are excellent.it's a combination of thier valve job and comb. chamber CNC work that generates their excellent midlift numbers.

vettenuts

iTrader: (4)

I e-mailed Ed Potter on these heads a few days ago but haven't heard back. Specifically, I wanted the cross sectional area change with the porting, how much they take off of the rocker bosses and whether weld repair is necessary, and how much they would hurt low end torque. I have their flow plotted against all the new comers and the stockers. The flow excellent, but the port volume (I have read it is lower than 250 cc but still rather larger) is cause for concern. However, they did have help from GM on these heads and knew exactly where to work on them and they also worked on the swirl pattern. Not sure how this all plays on the lower RPM torque though, but the way I see it, the lightweight valves are a difinite advantage.

66deuce

iTrader: (1)

there's a couple dyno runs on here of the GMPP heads,the one i saw awhile back showed decent TQ down low,i believe it was with an FM12 or 13 cam.do a search i'm sure that post is still on here.