Pro Stock John

iTrader: (34)

I was wondering what flow numbers folks are getting with ported 6.0 heads with 2.02/1.57 valves.

Also if you have 2.05 or 1.60's, can you tell much how much more cfm the bigger valves were worth.

Thanks!

Linear Velocity

iTrader: (1)

My friend Micah's car has AAP 6.0 heads, they were 2.02/1.57 valves and flowed 342 cfm. These heads were done about a year ago and were done by Race Prep. www.race-prep.com

verbs

I believe TEA is getting in the 335cfm area flowed on a bigger bore 4.0x for strokers....and 320cfm on the smaller bores of 3.9....this is with the Massengale program.

Pro Stock John

iTrader: (34)

Wow.

My 6.0 heads with 2.02/1.57 valves flow 300/220.

gator's 99TA

iTrader: (2)

PSJ, your heads flow about 300 cfm. that is just fine considering you dont live in a world at one barometric pressure! listen to the mustang guys that are running 9s all day on box stock TFS heads that dont flow as well as yours. when pushing the kind of cfm you are, there is room for error.

Cricket99SS

Race-Prep's heads seem to be > *

However, at $3,100 + cores for Stage III's, I suppose they should be!

AP-Engineering

Our Stage I 6.0 liter heads just like PSJ has on his car are flowing these numbers.

Intake
.100 lift / 66 cfm
.200 lift / 139 cfm
.300 lift / 212 cfm
.400 lift / 259 cfm
.500 lift / 283 cfm
.600 lift / 297 cfm
.700 lift / 305 cfm

Exhaust flowed w/tube
.100 / 62 cfm
.200 / 116 cfm
.300 / 160 cfm
.400 / 199 cfm
.500 / 219 cfm
.600 / 229 cfm
.700 / 243 cfm

Tested @ 28"
3.970 bore size
2.02/1.575 valves

absolute

John, you have to be carefull when looking and comparing the various flow numbers on 6.0l castings through a radius inlet. 6.0l heads are one of the toughest heads to get to flow without stalling through an intake. You can have your 340cfm heads but if it stalls at .500 lift flowing 260 cfm through an ls6 intake its not going to make as much power as a head that flows 300 cfm but will flow 280cfm up to .600 lift with the intake attached. I had to change my 6.0l intake port several times before I had success with and without an intake, my latest will peak 315cfm At .600 and 285 through an ls6 intake.

Linear Velocity

iTrader: (1)

True, but dyno resluts speak for them selves. Micah's car made 447 rwhp and 409 rwtq (again last year) thru mac headers. The heads weren't milled at all so also had a 9:1 CR

blackz93

iTrader: (2)

could you maybe explain that to me...i dont fully understand the deal with the baro pressure.

BlackNite383

My 6.0 GTP S2 heads have 2.02/1.57 Ferrea valves and flow 308cfm@.500 lift and about 318cfm@ my intake cam lift .566 lift. He got great flow numbers without hogging out the intake runners. He only removed 2 to 3 cc's from the runners. That was at my request. With a 383 stroker and a blower Craig said that I really could benefit from more runner volume. But I like the idea of smaller, high velocity runners, even though blowers like more volume than N/A setups. Well he managed to get killer numbers at low lift and high lift. I was really shocked with the flow at only .500 lift. Over 300cfm is awesome.

Pro Stock John

iTrader: (34)

Chris, any idea on the .550 numbers?

I have a flow sheet on a set of LS6 heads from the same source and they did:

296.9, 222.4/.500
299.3, 227.7/.550
301.8, 233.1/.600
305.6, 236.7/.650

I think these other heads have bigger valves which I know can bump up the flow numbers by like 10 cfm

ONEBADWS6

iTrader: (22)

I have TEA 6.0L heads with 2.05 1.60 valves, flow is 324@600 and 277@600 with a pipe.