 TFS TW Aluminum | GT-40 Aluminum | GT-40 Cast iron | GT-40 vs. E7TE |
GT-40 heads vs. Ported E7TE Head Flow Tech by Peter L. Turek
11/03/95 and
2/07/96 ported GT-40 heads and ported
E7TE stock heads Flow Summary
CFM Chart
---------+--------+--------+--------+--------+--------+--------+--------
Valve | | | | | | |
Lift | | .200" | .300" | .400" | .500" | | .600"
---------+--------+--------+--------+--------+--------+--------+--------
stock | | | | | | |
GT-40 int| | 111 | 159 | 183 | 185 | | 190
---------+--------+--------+--------+--------+--------+--------+--------
ported | | | | | | |
GT-40 int| | 115 | 166 | 193 | 208 | | 210
---------+--------+--------+--------+--------+--------+--------+--------
CFM Inc. 4 7 10 23 20
% Inc. 3.60% 4.40% 5.46% 12.43% 10.53%
---------+--------+--------+--------+--------+--------+--------+--------
stock | | | | | | |
(E7TE)int| 48 | 90 | 135 | 150 | 161 | 164 |
---------+--------+--------+--------+--------+--------+--------+--------
ported | | | | | | |
(E7TE)int| | 125 | 174 | 193 | 199 | | 208
---------+--------+--------+--------+--------+--------+--------+--------
CFM Inc. -48 35 39 43 38 -164
% Inc. -100.00% 38.89% 28.89% 28.67% 23.60% -100.00%
------------------------------------------------------------------------
CFM Comparison between (E7TE) and
GT-40
Heads' intake ports; Below
stk E7TE 48 90 135 150 161 164 164
stk GT-40 111 159 183 185 187 190
CFM diff 21 24 33 24 23 26
% inc/dec 23% 18% 22% 15% 14% 16%
ptd E7TE 125 174 193 199 208
ptd GT-40 115 166 193 208 210
CFM diff -10 -8 0 9 2
% inc/dec -8% -5% 0% 5% 1%
------------------------------------------------------------------------
Lift .100" .200" .300" .400" .500" .550" .600"
---------+--------+--------+--------+--------+--------+--------+--------
Stock | | | | | | |
GT-40 ex | | 28.5 | 125 | 129 | 129 | |
---------+--------+--------+--------+--------+--------+--------+--------
Ported | | | | | | |
GT-40 ex | | 101 | 142 | 172 | 174 | 173 | 173
---------+--------+--------+--------+--------+--------+--------+--------
CFM Inc. 72.5 17 43 45
% Inc. 254.39% 13.60% 33.33% 34.88%
---------+--------+--------+--------+--------+--------+--------+--------
ported | | | | | | |
E7TE ex | 41 | 80 | 117 | 140 | 149 | 151 |
---------+--------+--------+--------+--------+--------+--------+--------
prtd E7TE| | | | | | |
1.54 vlv.| | 114 | 145 | 153 | 157 | | 158
---------+--------+--------+--------+--------+--------+--------+--------
CFM Inc. 34 28 13 8 -151
% Inc. 42.50% 23.93% 9.29% 5.37% -100.00%
------------------------------------------------------------------------
CFM Comparison between (E7TE) and
GT-40
Heads' exhaust ports; Below
prtd E7TE 41 80 117 140 149 151
stk GT-40 28.5 125 129 129 0
CFM diff -51.5 8 -11 -20
% inc/dec -64% 7% -8% -13%
------------------------------------------------------------------------
1.54 E7TE 114 145 153 157 158
ptd GT-40 101 142 172 174 173
CFM diff -13 -3 19 17 15
% inc/dec -11% -2% 12% 11% 9%
GT-40 Intake-to-Exhaust ratio
------------------------------------------------------------------------
Lift .100" .200" .300" .400" .500" .550" .600"
------------------------------------------------------------------------
Stk int
stk ex 26% 79% 70% 70%
------------------------------------------------------------------------
stk int
prtd ex 89% 94% 94%
------------------------------------------------------------------------
prted int
stk ex 25% 75% 67% 62%
------------------------------------------------------------------------
prtd int
prtd ex 86% 89% 84%
Ported E7TE Intake-to-Exhaust ratio
------------------------------------------------------------------------
Lift .100" .200" .300" .400" .500" .550" .600"
------------------------------------------------------------------------
Stk int
sm ex 89% 87% 93% 93%
------------------------------------------------------------------------
stk int
big ex 127% 107% 102% 98%
------------------------------------------------------------------------
prted int
sm ex 64% 67% 73% 75%
------------------------------------------------------------------------
prtd int
prtd ex 91% 83% 79% 79% ERR 76%
* GT-40 intake to exhaust numbers are good. The ported stock equipment
has problems because intake increases good to .600" and exhaust doesn'
* I believe the 1 port tested for the ported 1.54 exhaust was simply
a "slow" port. More work is required on that port or any other one
similar to it, to bring the high lift (.600") numbers up to specs.
* more ports for will be tested and this spreadsheet updated for better
consitency in the future. The exhaust ports on the ported E7TE were
not quite of consistent size and shape leading me to believe this
158 CFM @ .600" lift exhaust port was slow compared to the other
untested exhaust ports.
* Please note also that many of the stock and ported ports given
for comparison were not the same ports before/after porting,
and some were tested on different dates.
Peter L. Turek
(All tests performed at Don Scinto Automotive in Stratford, CT
on a JKM flowbench)
The Corral: Late Model Mustang Web
Images, text and concepts Copyright © 1996
All Rights Reserved
Duplication Strictly Prohibited