Discuss Has anyone changed to 4 valve heads on the S197 Mustang GT? on AllFordMustangs.com, the place for Mustang enthusiasts.
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#1 permalink
Apprentice
S197 Member
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Fort Riley
Kansas
Has anyone changed to 4 valve heads on the S197 Mustang GT? I've decided to stay NA, so every little bit will help. I was contemplating changing my heads from 3 Valves to 4 Valves. If anyone has done this before or if it isn't practical I'd really like to hear from you. Thanks guys and gals.
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#2 permalink
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The 3 valve heads flow as good as the 4 valve heads. Not much to be gained.
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#3 permalink
Apprentice
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Fort Riley
Kansas
Dang, well worth a try to investigate. Guess I'll stick with some improved heads and a port polish.
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#4 permalink
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All the 3V heads are from the same cast. Just ported differently.
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#5 permalink
Apprentice
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Fort Riley
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Double damn. Foiled once again.
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#6 permalink
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Quote:
Originally Posted by
Richard Double damn. Foiled once again.
FRPP and Livernois both use the Ford cast heads. I'm running the FRPP version with stage 3 cams.
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#7 permalink
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Michigan
Quote:
Originally Posted by
stlwagon The 3 valve heads flow as good as the 4 valve heads. Not much to be gained.
a set of 03/04 cobra heads will outflow the 3V's all day long.
#8 permalink
Made Member
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South Central
Wisconsin
Quote:
Originally Posted by
stlwagon The 3 valve heads flow as good as the 4 valve heads. Not much to be gained.
Which 4 valve heads? There are 3 different versions including the GT heads. The GT heads should be better than the 3 valve heads.
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#9 permalink
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Quote:
Originally Posted by
jgard07 Which 4 valve heads? There are 3 different versions including the GT heads. The GT heads should be better than the 3 valve heads.
and they are better.
#10 permalink
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Lake County
Illinois
That would be a big project, very costly for little or no gain.
#11 permalink
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Lake County
Illinois
Natrurally aspirated is not a good choice on the 4.6 3-valve.
#12 permalink
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Tampico, Mexico
Quote:
Originally Posted by
Ricesmoker Natrurally aspirated is not a good choice on the 4.6 3-valve.
yup, thats the result on the terminator and GT500 now
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#13 permalink
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Dallas/Fort Worth
Texas
STLWagon, you're Normally Aspirated right? How much power are you putting down with all your mods? I've always built engines to run Normally Aspirated. Nothing more fun than smoking a Forced Induction car. My 67 Mustang puts down 546hp and 550lbs torque to the ground. That's with no NOS or boost. Nothing like a stroked 408 Windsor
#14 permalink
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Fresno
California
Quote:
Originally Posted by
stlwagon The 3 valve heads flow as good as the 4 valve heads. Not much to be gained.
stlwagon, do you have a page with this information? I would like to check it out.
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#15 permalink
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Quote:
Originally Posted by
jonballi STLWagon, you're Normally Aspirated right? How much power are you putting down with all your mods? I've always built engines to run Normally Aspirated. Nothing more fun than smoking a Forced Induction car. My 67 Mustang puts down 546hp and 550lbs torque to the ground. That's with no NOS or boost. Nothing like a stroked 408 Windsor
Correct... 408 rwhp/422 rwtq.
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Has anyone changed to 4 valve heads on the S197 Mustang GT? 
