Camming a 409 sbc with small intake runner

[GARY C]

If you feel your numbers are correct then ask yourself how your getting 97 cfm through a 2" valve and only 92 cfm through a 2.08 and how you are the only one in the industry or world for that matter that can get an impossible amount of air through a valve of that size at a .100 lift, as the valve size and seat dictate that flow not porting.

It could be your calculations.

Are you using a 45 degree seat or a 30?

[BowtieNut]

If you feel your numbers are correct then ask yourself how your getting 97 cfm through a 2" valve and only 92 cfm through a 2.08 and how you are the only one in the industry or world for that matter that can get an impossible amount of air through a valve of that size at a .100 lift, as the valve size and seat dictate that flow not porting.

It could be your calculations.

Are you using a 45 degree seat or a 30?

Not being smart but the approach to the seat and the chamber shapes beyond the top valve seat angle and valve shrouding aren't a contributing factor in low lift flow? The LT1 heads are cut for and flowed on a 4.155 bore. Its a 45 degree seat.I've seen bosses that protrude in a port just beyond the push rod pinch that when removed increased low lift flow. Turbulence in the port up stream seems to affect how well the flow is using the circumference of the valve in instances that I've seen. But what do I know?

[GARY C]

Not being smart but the approach to the seat and the chamber shapes beyond the top valve seat angle and valve shrouding aren't a contributing factor in low lift flow?

Yes they do but not at.100 lift where flow is almost totally controlled by valve seat alone and not to the tune of 20 cfm, 78 cfm is not unheard of, i have some 2.08's that flow that and occasionally and some guys get 80 cfm with a lot of seat testing... from .200 up chamber and unshrouding plays a big part.

[BowtieNut]

Well I have checked my setup, checked calibration on bench, checked for leaks and today the 2 inch valve moved 95 cfm at. 100 lift. I will go as far as making a video but I'm sure it would still leave everyone suspicious. If it that impossible then ill be damned if i know whats going on.

[af2]

If you feel your numbers are correct then ask yourself how your getting 97 cfm through a 2" valve and only 92 cfm through a 2.08 and how you are the only one in the industry or world for that matter that can get an impossible amount of air through a valve of that size at a .100 lift, as the valve size and seat dictate that flow not porting.

It could be your calculations.

Are you using a 45 degree seat or a 30?

It does not matter.. There is no way whatsoever period. unless the valve fell out in testing?

On the same token, You do nice work looking at the pictures..

[BowtieNut]

It does not matter.. There is no way whatsoever period. unless the valve fell out in testing?[quote][/quote]

If you are so sure its impossible please enlighten me. You must have a detailed exclamation if you are that certain.

[Wolfplace]

Bowtie,
You need to listen to what you are being told,,,
That or put the spark plug in the head
Here are just a few examples I have handy all with a hell of a lot more port & valve than you are using to give you a sanity check

All tests @ 28", radius inlet, no pipe, 4.530 bore except the 315 intake on the 4.310 bore
781's 2.19/1,88
.05 - 40/33
1 -69 / 56
2 - 158 / 102
3 - 217 / 135
4 - 254 / 161
5 - 263 / 186
6 - 274 / 209
7 - 272 / 219
==============
Perf RPM #60459 290cc Intake port 2.19x1.88 110cc chamber
.050 - 41/ 32
.100 - 73/ 64
.200 - 148/119
.300 - 218/149
.400 - 268/179
.500 - 304/207
.600 - 317/229
.700 - 319/245
================
RR OVAL 270cc port CNC chamber
.050 - 42/33
100 - 77/65
200 - 152/118
300 - 224/147
400 - 283/178
500 - 318/205
600 - 344/230
700 - 347/248
=============
RR Rect 290cc port CNC chamber intake only
050 - 41
100 - 80
200 - 153
300 - 227
400 - 280
500 - 319
600 - 345
700 - 352
==============
AFR 315 CNC
4.530" ===========4.310" bore
..050 - 40/34 =======43.4
.100 - 78/69 ========78.1
.200 - 164/142.5 =====162.3
.300 - 247/198 ======239.5
.400 - 309/240====== 290
.500 - 350/267 ======334.4
.600 - 375/280 ======358.3
.700 - 383/283 ======374
.800 - 381/286 ======377

[Carnut1]

Those vertec flow numbers are BULL SHIT


JOE SHERMAN RACING

My all time favorite Big Joe quote!