budhayes3

iTrader: (19)

Here's some info on the heads that I copied and pasted from WCCH's website...

WCCH Stage 2 CNC Ported 6.01 #317
Flow Data @ 28" Water:

Valve Lift Intake Lift Exhaust Lift

.100" 70.1 59.1
.200" 145.4 119.1
.300" 210.0 174.2
.400" 250.0 213.3
.500" 288.1 228.5
.550" 303.0 230.7
.575" 305.8 230.9
.600" 294.3 231.9

Intake runner volume = 232.4cc
Exhaust runner volume = 86.3cc
Combustion chamber volume = 73.5cc(w/min. mill)
Test bore = 4.030"
Intake port tested with radius flow plate
Exhaust tested with stub pipe

budhayes3

iTrader: (19)

My gut's telling me that these heads are gonna put me over the edge lol (not that that's a bad thing)

sonoma43

iTrader: (1)

If you do end up upgrading the injector's let me know if you wanna sell the 31lb'ers! i'll take'em (depending on price)!

GMCtrk

iTrader: (27)

what size valves do those heads have bud?

That's weird how the flow drops off at .600" but those flow very nicely at 550.

That intake runner size is a tad too hogged out for my liking. I think the heads I got are 225cc. I'd love to have the 205cc AFR'd though for the increased air velocity

Here's the flow on the ones I bought:

Valve Lift
Intake
.100" 72
.200" 142
.300" 205
.400" 255
.500" 286
.600" 305
.650" 310

DBVille

RC Engineering has an online calculator for injector sizing. It tends to be conservative - probably good when ordering, not so good if you are seeing how far you can push your existing equipment.

http://www.rceng.com/

Under Tech Notes/Sizing

blackbeast ss

iTrader: (4)

not knockn on your heads but. . . the CFM vs port volume isnt all that great. . they have 232 CC intake runners, there are heads flowing more cfm and better ex relation with 205 and 215 cc heads. . .just my .02

GMCtrk

iTrader: (27)

It's more likely that WCCH isn't artificially inflating their flow numbers

budhayes3

iTrader: (19)

Ya know, I was under the impression that the intake valves were the stock 2.00...I haven't looked at the paperwork for the heads in over a year lol. You're right, the intake runner size is kinda large, but I pretty much just put my trust in WCCH and figured that they knew better than me.

No offense taken

budhayes3

iTrader: (19)

Thanks for the link...I plugged in some numbers...450hp (which should be more than I'm pushing I'd believe...someone feel free to correct me if I'm wrong), 56 psi of fuel pressure at the rail (that's about right isn't it?), and the other info (8 injectors, .50 BSFC, 80% desired IDC), and it came up with 30.99lb injectors as being needed...if this info is correct I'll "squeak by" like Jeff Spicoli...

DBVille

Be careful - the 30.99 is if they are rated at 43.5 psi, and operated at 56 psi. That program includes adjustments in fuel rail pressure. I am not familiar with the Chevy pressures to know how that impacts the results. If you use injectors rated at the same pressure they are operated at, you would be seeing 91% IDC.

With that being the case, the injectors would be marginal at best. While they say not to exceed 80%, that is a good design practice, and depending on the injectors and ECU, you may be able to exceed that by a good margin. Also depends on how rich you want to run it.