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Old 02-05-2008, 10:00 PM   #1
3150Mach1
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Head differences

Can someone give me the short and sweet differences between:

03/04 Mach1 Heads

03/04 Cobra Heads

FR500 4.6L Heads
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Kooks LTsw/OR X, elect cutouts, JLT RAI w/C&L 85 MAH,1" Spacer,PP Lower intake,Accufab TB,160 T-stat,EF Cooling Mod,NX Kit,Mez Electric Water pump,SLP Linelock,FRPP 4.10s-Alum Dif Cover-Alum Driveshaft & SL, Steeda Bumpsteer,MM Alum rack bushings,Deep Alum Tranny pan,Predator,Steeda AUCAs,MM ALCAs, Dspecs,MM CC plates & FLSFCs,MRT Guage cluster,AEM WB,MRT hood struts,Seq TLs, carbon fiber hood/trunk/Cobra wing,220 amp alt
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Old 02-05-2008, 10:10 PM   #2
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Re: Head differences

Quote:
Originally Posted by 03Mach150BP View Post
Can someone give me the short and sweet differences between:

03/04 Mach1 Heads

03/04 Cobra Heads

FR500 4.6L Heads
There is no difference between the Mach and Cobra heads that you listed. The FR500 heads flow better(some think the 03/04 heads flow just as good), and benifit by changing the cam's, valves, and springs.
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Old 02-05-2008, 10:17 PM   #3
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Re: Head differences

I think there was an early production issue with the 03 heads (both Mach and Cobra) and this issue was fixed in later part of 03 and did not affect 04's. I am not sure if it was the guides, but it dealt with head tick. Also I have read something about 04 heads have a improved cooling, but I have no idea how.
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Old 02-05-2008, 10:19 PM   #4
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Re: Head differences

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Originally Posted by blown03Mach1 View Post
I think there was an early production issue with the 03 heads (both Mach and Cobra) and this issue was fixed in later part of 03 and did not affect 04's. I am not sure if it was the guides, but it dealt with head tick. Also I have read something about 04 heads have a improved cooling, but I have no idea how.
I saw the same thing over on stangnet. Just trying to get some info. My next big move might be PP heads with F500 valve train or Crower S2s.
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2003 slowmatic 11.105@117mph w/125 shot of Nitrous best to date
Kooks LTsw/OR X, elect cutouts, JLT RAI w/C&L 85 MAH,1" Spacer,PP Lower intake,Accufab TB,160 T-stat,EF Cooling Mod,NX Kit,Mez Electric Water pump,SLP Linelock,FRPP 4.10s-Alum Dif Cover-Alum Driveshaft & SL, Steeda Bumpsteer,MM Alum rack bushings,Deep Alum Tranny pan,Predator,Steeda AUCAs,MM ALCAs, Dspecs,MM CC plates & FLSFCs,MRT Guage cluster,AEM WB,MRT hood struts,Seq TLs, carbon fiber hood/trunk/Cobra wing,220 amp alt
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Old 02-05-2008, 10:30 PM   #5
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Re: Head differences

I believe your correct about the head ticking, my friend works for a dealer and they replaced alot of heads that way, also BP I think your correct about the cooling on the early heads, they did come out with revised one's I beleive.

BP I'm just using gt cams, upgraded springs and oversized valves for my build with pp heads. Looking back, I should have just bought the FR500 vt, because it comes with everything.............LOL
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Old 02-05-2008, 10:31 PM   #6
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Re: Head differences

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Originally Posted by wchamberlain View Post
I believe your correct about the head ticking, my friend works for a dealer and they replaced alot of heads that way, also BP I think your correct about the cooling on the early heads, they did come out with revised one's I beleive.

BP I'm just using gt cams, upgraded springs and oversized valves for my build with pp heads. Looking back, I should have just bought the FR500 vt, because it comes with everything.............LOL
So our heads with F500 package. Does PP the heads help as well?
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2003 slowmatic 11.105@117mph w/125 shot of Nitrous best to date
Kooks LTsw/OR X, elect cutouts, JLT RAI w/C&L 85 MAH,1" Spacer,PP Lower intake,Accufab TB,160 T-stat,EF Cooling Mod,NX Kit,Mez Electric Water pump,SLP Linelock,FRPP 4.10s-Alum Dif Cover-Alum Driveshaft & SL, Steeda Bumpsteer,MM Alum rack bushings,Deep Alum Tranny pan,Predator,Steeda AUCAs,MM ALCAs, Dspecs,MM CC plates & FLSFCs,MRT Guage cluster,AEM WB,MRT hood struts,Seq TLs, carbon fiber hood/trunk/Cobra wing,220 amp alt
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Old 01-24-2009, 04:01 PM   #7
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Smile Re: Head differences

Ok i give up ? What is this head tick issue on early 03 mach 1 "s
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Old 01-24-2009, 04:05 PM   #8
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Smile Re: Head differences

Ok i give up ? What is this head tick issue on early 03 mach 1 "s
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Old 02-20-2009, 09:38 AM   #9
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Re: Head differences

Poor cooling on cylinders 7 & 8 cause valve guide wear,
and the "tick" is the valve.
Much different than piston slap.
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Old 02-21-2009, 04:02 PM   #10
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Re: Head differences

i have heard that it not so much guide ware as it is the guide getting hot & slipping down & some where hitting valve on one of the other boards there is a big wright up about it & this sounds more like it to me then piston slap
but what do i know ????
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Old 06-11-2009, 01:55 PM   #11
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Re: Head differences

I have read this entire thread, and have learned alot about these mod motors... I also have a ticking noise that resembles both an exhaust leak, a loud injectors, or valve problem! I dont know what it is, and it seems like a lot of people have different theories about with the issue is! My question, that has gone unanswered on this thread is WHAT IS THE EFFECT OF THIS TICKING? Has anyone had their engine damaged due to this ticking, or any gone wrong with out treating this ticking? I would think that if this is a valve issue, or a pistion-cylinder issue, that under hard driving conditions this would digress into a "Holy crap, I just blew my engine" situation! Has anyone in here with the ticking issue allowed it to go untreated and suffered the consequences, or "it keeps on ticking," but she still runs like a Top?! I just purchased this vehicle on Saturday, and noticed the noise, the car only has 13,000 miles on it, and want know if this will damage the car! Thanks!
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Old 06-11-2009, 02:12 PM   #12
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Re: Head differences

i love threads like this
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