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02-05-2008, 10:00 PM | #1 |
Love my Mach
Join Date: Apr 2005
Location: Charlottesville, VA
Posts: 13,678
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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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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 |
02-05-2008, 10:10 PM | #2 |
Pro-gun Conservative!
Join Date: Jul 2003
Location: Murrieta Calif.
Posts: 3,608
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Re: Head differences
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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02-05-2008, 10:17 PM | #3 |
8LB YNER
Join Date: Mar 2005
Location: Tampa
Posts: 5,661
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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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02-05-2008, 10:19 PM | #4 | |
Love my Mach
Join Date: Apr 2005
Location: Charlottesville, VA
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Re: Head differences
Quote:
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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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02-05-2008, 10:30 PM | #5 |
Registered User
Join Date: May 2006
Location: Alvin, TX
Posts: 932
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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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02-05-2008, 10:31 PM | #6 | |
Love my Mach
Join Date: Apr 2005
Location: Charlottesville, VA
Posts: 13,678
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Re: Head differences
Quote:
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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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01-24-2009, 04:01 PM | #7 |
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Join Date: Jan 2009
Location: Chapin S.C.
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Re: Head differences
Ok i give up ? What is this head tick issue on early 03 mach 1 "s
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01-24-2009, 04:05 PM | #8 |
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Join Date: Jan 2009
Location: Chapin S.C.
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Re: Head differences
Ok i give up ? What is this head tick issue on early 03 mach 1 "s
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02-20-2009, 09:38 AM | #9 |
Torque wins!
Join Date: Dec 2004
Location: Florida
Posts: 13,167
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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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02-21-2009, 04:02 PM | #10 |
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Location: cuba mo
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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 ???? |
06-11-2009, 01:55 PM | #11 |
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Join Date: Jun 2009
Location: Saint Cloud, FL
Posts: 72
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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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06-11-2009, 02:12 PM | #12 |
1 man Army
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Re: Head differences
i love threads like this
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Dan |
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