work in progress

iTrader: (2)

Just got the flow numbers from my head porter and they are great even being 100* and humid in their shop(flow bench was just checked too). @.600in lift intake 351 ex. 244, and the numbers are even better down low. I was worried due to all the negative remarks I have heard about screwing these heads up. He has always built me badass setups, guess I shouldn't have sweated it. Can't wait to get the bad boy together and on the road!!

C6_CAMMiN_Z06

what heads? in the SS?

ctd

iTrader: (1)

Who is the head guy? What heads? Before #'s?

work in progress

iTrader: (2)

823's, and yes I the SS

work in progress

iTrader: (2)

He's not a sponsor, stock they flowed 319 /215 @ .600

ctd

iTrader: (1)

Where do they stall? Is there a before after number as well?

Very nice improvement.

I'm just curious as I had Chris Frank prep a set of heads, with similar before & after improvements. Very real gains from .400 lift. The stall speed moved up as well, my cam is in the .650 area.

work in progress

iTrader: (2)

what do you mean by stall speed?

Sales@Tick

iTrader: (3)

Where do they stop picking up flow, what lift.

This is referred to as stall.

work in progress

iTrader: (2)

Never new that term, learn something new everyday. I don't really see where there is a stall.

w/o pipe / pipe
240/244 230/237

before
in. ex
.200
.200 144 115
.300 211 160
.400 269 193
.450 290 201
.500 301 208
.550 314 211
.600 321 216
.650 330 219


After

.200 144 121
.300 220 169
.400 279 198
.450 297 205
.500 323 216
.550 337 238
.600 351 244
.650 359 249

Sales@Tick

iTrader: (3)

If your porter or you would have them flowed up to .800 or higher you would be able to see where the port begins to stall.

Up to .650 lift it will be hard to see where that happens as most good head porters like you have will be able to create good flow numbers in the region you have listed as that is where you're most likely to be in that lift range with a hydraulic roller.

work in progress

iTrader: (2)

He has already bagged them for me to pick them up, but I'll ask to see if he will put them back on the flow bench. What difference would it make to me since my cam is way under .650 lift? Will stall come in to play due to large duration?

Tainted

iTrader: (9)

For you theres no point in knowing. I bekieve he was just making the point that had the flow continued on you would see the stall area better

ctd

iTrader: (1)

Nice they are picking up @ lower lift. Are you going to dyno & re tune? It will need a sizable amount of fuel.

My heads started as TF 235's rough cut, so the runner is 10-12 smaller than off the shelf. The finished version is 235-237 with 31 cfm better than what I took off.

They stall @ .700

Sales@Tick

iTrader: (3)

Thanks for grabbing that answer for me!

No point in knowing, for what you have you have a good set of heads. No need to know what could have been.

work in progress

iTrader: (2)

You guys have me curious now, so I will ask him to flow them for comparison. Thanks for all the information.

ctd

iTrader: (1)

Your head guy may already know the answer, it's a topic that got me going on why my motor was not meeting expectation's. A thread on this forum perked my interest with a discussion involving a couple of guy's from Australia.

For other reasons my car was sitting with headers & intake off, so I decided to pull the heads. The cylinder heads were not going to get me to my expected power level.

work in progress

iTrader: (2)

What are your expectations and what are you making

ctd

iTrader: (1)

I'm 30 rw & 30 ft lbs below my original goal. Hoping the additional 31 cfm is going to get me there. The heads will be the only change, so a more than fair test. No that's not true the Fast 102 had problems as well.

All in all it will be interesting test.

work in progress

iTrader: (2)

the heads stall at just over 700 C F M.
.700 in 365 ex 254
.750 in 345 ex 257

ctd

iTrader: (1)

Nice.

You mean they stall just over .700 lift