351 Cleveland 4V Flow Data

[nwhp]

Hello,

Does anyone have flow test results for unported 4V cast iron 351C cylinder heads. The castings we have are D3ZE-AA & D1ZE-DA.

I searched but didn't find any results.

Thanks in advance.

[Mpcoluv]

Listed below is my flow test on a superflow 600.

Stock open chamber 4V heads with undercut milodon megaflow valve -unknown
valve job intake only
Lift Scale % of scale CFM (stock head)
0.025 1 71.2 24.8
0.050 2 63.2 69.38
0.100 3 55.6 82.88
0.150 3 78 115.44
0.200 4 49.2 145.63
0.250 4 58.7 173.75
0.300 4 65.3 193.288
0.350 4 70.8 209.568
0.400 4 77 227.92
0.450 4 83.1 245.946
0.500 4 87.4 258.704
0.550 4 91.4 270.544
0.600 4 94.2 278.832
0.650 4 96.2 284.752
0.700 4 96.7 286.23
0.750 4 96.5 285.64



Same head with roush stuffer and possibly poor clay job. also played with
the swirl meter. note stuffer hurt flow some. May be due to the clay job.

Lift %of scale CFM Swirl
0.025 64 22.36
0.050 60.5 42.35
0.100 54.5 80.66 246
0.150 71.8 106.26
0.200 48.5 143.56
0.250 57.3 170.496 33
0.300 65.2 192.99
0.350 70 207.2 322
0.400 74.6 220.82
0.450 79.2 234.423 610
0.500 82.2 243.312 900
0.550 84.4 249.824 1168
0.600 86 254.56 1500
0.650 87.6 259.296 1800
0.700 88 260.48 1900
0.750 89.4 264.264

I have tried editing this post but for some reason it is cramming all of my numbers together.
I am too lazy to type the whole thing over. Sorry.

[sleeper sedan]

... here's what I got.

Superflow 600 @28"

OLD NUMBER - STOCK CASTING, CLOSED CHAMBER 4V
Lift - IN / EX

.050 - 32 / 28
.100 - 66 / 42
.200 - 132 / 76
.300 - 194 / 114
.400 - 254 / 142
.500 - 290 / 166
.600 - 312 / 180


NEW NUMBERS - BOWL GRIND
Lift - IN / EX

.050 - 35 / 27
.100 - 70 / 55
.200 - 134 / 97
.300 - 198 / 129
.400 - 252 / 154
.500 - 290 / 175
.600 - 328 / 191
.700 - 352 / 203
.750 - 324 / 203

[Mpcoluv]

Wow!
Your .500 and .600 numbers were much more than mine on the same type of bench.
I wonder why...?

[Mark Workman]

I've worked on 2 sets of these in the last few months; a set of NOS Boss 302 service heads with stock Ford parts and zero miles, and a set of closed chamber 351C heads, DOAE, with stock Ford parts and what looked like the original valve job. Same bench, an SF-600, at 28".

Boss 302
.050 34.5/25.8
.100 71.4/60.0
.200 149.1/98.6
.300 220.7/128.0
.400 268.8/154.2
.500 286.6/167.9
.600 290.1/176.5
.700 297.7/178.1

351C D0AE:
.050 35.4/25.5
.100 72.0/54.2
.200 145.2/93.7
.300 211.8/125.8
.400 270.3/151.4
.500 298.6/172.4
.600 301.7/185.1
.700 304.0/185.4

[nwhp]

Thanks for the replies, I appreciate the information. Does anyone have numbers over .700"? Customer has a cam that is .779" / .739" lift.


Thanks again.

[RL]

Your .500 and .600 numbers were much more than mine on the same type of bench

This happened to us also

Maybe head misplacement on the bore fixture
Maybe no notch in your bore adaptor

[Troy Patterson]

I've flowed the DOAE on a 600 bench and didn't see more than 285 cfm @ .600" out of a virgin casting. Could be wrong since there are variations in even mass produced castings, but I think the benches showing more maybe a bit generous.

Troy Patterson TMPCarbs.net TMP Carbs

[Mpcoluv]

The test fixture I used did NOT have the bore notch.
Can that really mean anything at .600 lift?

[RL]

Is this what your after
2mm notch in bore adaptor gain over previous std test at 28"

0.050" 0.9cfm gain
0.100" 0.2
0.200" 1.2
0.300" 6.2
0.400" 6.3
0.500" 3.2
0.600" 2.8
0.700" 1.2
0.800" 3.0
0.900" 1.2
1.000" 2.9

5mm notch in bore adaptor gain over 2mm notch at 28"

0.050" 0.0
0.100" 0.4
0.200" 1.4
0.300" 1.2
0.400" -0.2
0.500" 1.2
0.600" -0.2
0.700" -2.0
0.800" -0.3
0.900" 1.8
1.000" -0.3

add them together for a total

If you incorrectly place the edge of the notch level with the edge of the bore adaptor, kind of move the head over compared to where it is actually on the bore, you will see even more flow at mid lift