Big Red Z28

iTrader: (4)

Just wondering what the flow rates of any one else who has the trick flow 215 heads milled to 61cc. Do mine seem normal or should they be greater due to the milling of the head?

Lift Intake Exhaust

.100 68.1 59.0
.200 138.3 118.6
.300 219.9 185.5
.400 273.6 227.8
.500 306.7 251.8
.550 313.3 258.2
.600 319.4 263.4

SLOC5LS6

Milling of the head usually reduces flow rate

Big Red Z28

iTrader: (4)

For some reason i was thinking it would increase. I'm new to the milling of the heads benefits thanks for you reply.

JScamaro

iTrader: (6)

Milling the head increases compression but reduces ptv clearance for a cam.

STEEPSS

iTrader: (30)

As a general rule, the power gained from the boost in compression due to milling the head will largely outweigh the loss of flow due to milling. Like anything, there is a happy medium though. I believe that after you mill past 59cc's or so, you start to dramatically decrease flow. (depending on the heads)

You MUST take into consideration your PTV (piston to valve) clearance also. If you are running a big cam, you might have issues when you mill your heads. I STRONGLY recommend you check your PTV clearance before you mill your heads so you can calculate the safe amount to mill. I also recommend checking PTV after they are milled. It is very cheap insurance.

vsocks1

iTrader: (6)

I agree with the above! I have TFS 215's milled to 61cc (I measured closer to 60cc). Anyway everyone told me I was okay with a 232/236 .595/.578 113+3 cam. Well, we measured and I only had 0.040" on intake at about 11* ATDC.
I ended up having to flycut my pistons on intake which is what I didn't want to do. Really glad I checked though cause it could have turned out real bad!!

Big Red Z28

iTrader: (4)

Thanks this is the info i'm looking for. My current cam is a comp cams 222/224 .566/.568 112 lsa. Does any one see any problems using this cam or should i do a swap? My intentions are daily driven, with stop light to stop light street racing with the track a few times a year.

SOMbitch

iTrader: (8)

That cam will clear fine.

Your flow #'s are great BTW.

vettenuts

iTrader: (4)

That cam should be OK, but always best to check it anyway. It doesn't take long, provides peace of mind and if its bad you may have another problem that you were unaware of. Degreeing the cam is a good idea also, or at least checking its installed position if you are not running an adjustable timing set.

9secondsflat

my flow rates declined less then 1% when they were milled to 61 cc's.