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Author
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Topic: 351C 4V Roush port stuffers
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Mpcoluv
Gearhead Posts: 1421
From: Charlotte NC usa
Registered: Apr 2001
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posted 07-08-2002 12:49 PM
 
Hi guys,
Just spent yesterday in front of a flow bench.
I tested a spare D3xx open chamber 4V head with unknown valve job and Milodon megaflow valves. First test was just the stock head as a benchmark. second test was with Roush stuffer. Below are the results: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 Next is the flow data of the intake with the Roush stuffer. Note that this didn't hurt flow much until around .600 valve lift. I think this is due to my testing method which did not use clay to smooth the transition from the tongue to the head near the short side radius. I need to run this test again with the transition smoothed. 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 Maybe later this week I can re-run the Roush stuffer test and then test the new Terry Parker stuffer (which looks like a .100 taller Roush stuffer).
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Jim Sams
'69 mustang Coupe
372C
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Rustang
Gearhead Posts: 880
From: Clarion PA
Registered: Nov 2000
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posted 07-08-2002 09:47 PM
I wish I'd have flow benched my Boss heads before installing the Roush spoons. Non-the-less, I got pretty good flow with them installed:
.100 - 70
.200 - 147
.300 - 213
.400 - 265
.500 - 300
.600 - 310
.700 - 321
This was prior to cleaning up the sharp ridge underneath the valve transition to the chamber, and I really didn't do any blending of the spoon to the port floor on the short side radius.------------------
'68 mustang 351 clevor- 10.92@124
'67 Stang, 351W -11.18@118
'69 351C Torino-14.90@100
'78 Pickup 351W-15.56@88
'79 Pickup 460 ET=??
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Mpcoluv
Gearhead Posts: 1421
From: Charlotte NC usa
Registered: Apr 2001
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posted 07-09-2002 05:30 PM
Rustang,
Your heads were ported right?
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Rustang
Gearhead Posts: 880
From: Clarion PA
Registered: Nov 2000
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posted 07-09-2002 06:23 PM
They have a very good valve job, the pockets were blended, and valve guide streamlined. Also, I raised the top of the port about 1/8" at the intake opening. It's amazing how these heads respond to what's basically basic portwork! Based on your results, I'm just wondering how much affect removing the spoons from my heads would affect the flow  [This message has been edited by Rustang (edited 07-09-2002).]
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Mpcoluv
Gearhead Posts: 1421
From: Charlotte NC usa
Registered: Apr 2001
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posted 07-09-2002 09:09 PM
quote:
Originally posted by Rustang:
They have a very good valve job, the pockets were blended, and valve guide streamlined. Also, I raised the top of the port about 1/8" at the intake opening. It's amazing how these heads respond to what's basically basic portwork! Based on your results, I'm just wondering how much affect removing the spoons from my heads would affect the flow [This message has been edited by Rustang (edited 07-09-2002).]
I think that you probably wouldn't see much gain and lose some velocity.
Do you need more than 321 cfm?
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