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Author
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Topic: FMX to C-4 or C-6. Which would you choose?
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skips69
Gearhead Posts: 346
From: Catlin, IL USA
Registered: Mar 2001
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posted 04-08-2001 12:56 AM
   
I have a 1969 FB with the original 351W 4V. It has been rebuilt and now has the Edelbrock RPM package rated at 400 HP. My FMX and 3:00 to 1 open diff just aren't letting the engine live up to it's potential. I will tackle a new set of gears soon (3:50 to 1), my dilemma lies with the tranny now. I have a C-4 and a C-6 at my disposal, but don't know which to have rebuilt. The car will see mostly show duty, with the occasional green light to red light romp. Any opinions of which tranny to use? Will my crossmember work? Can I use original driveshaft with either? How bad will my speedometer be off? Any other tips, suggestions, or problems I may be missing by making this swap? Thanks for your time.
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steve'66
Gearhead Posts: 9555
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 04-08-2001 04:24 PM
Skip,Go with a built C-4, I hear they use much less h.p. than any other and are lighter too. Can't help you with fit, but others will.  SteveW
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66351stang
Gearhead Posts: 711
From: sayville,newyork
Registered: Jul 2000
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posted 04-08-2001 11:09 PM
i have a 66 coupe with a 351svo, and c-4
the trans is worked, i had a c-6, to much modification to do also the c-6 is approx.40lbs heavier. also take about 30hp more to operate. the c-4 with some modifications will hold up fine.------------------
ponycar66,have you flown in a ford latley???????
66-COUPE W/351SVO
glad i had a v-8 !!!!!!
84.5 gt350-61 falcon 302
have a great day!!!!!!!!
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kid vishus
Gearhead Posts: 6617
From: middle of NC
Registered: Oct 2000
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posted 04-08-2001 11:42 PM
I run a c4 in my racecar and it holds up fine. Of course it has been modified , but I would not be afraid to put a c4 in any street car. I ran a stock c4 in my 70 behind a warmed 351C and never had any problems with it.
As for parts swappin, I dont know. I know the driveshaft and crossmember for the c4 and c6 are quite different, but I dont know about the fmx.
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JT
Gearhead Posts: 200
From: Pearland, Texas, USA
Registered: Oct 2000
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posted 04-09-2001 06:17 PM
I've got a C4 behind a basically stock 351W in my '68 coupe. I like the combination. I just wish I had an overdrive for cruising.------------------
JT
'68 Coupe w/351W
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mustangs68
Moderator Posts: 25375
From: Buckroe Beach Va MCA#39406 M&M #12 Member Mustang Club of Tidewater
Registered: May 99
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posted 04-09-2001 08:42 PM
I have a C-4 that has TCI parts i it..I love it!now about them gears
sam
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HHuggins
Gearhead Posts: 259
From: Laguna Niguel, CA
Registered: Feb 2001
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posted 04-10-2001 03:05 AM
Skips,Tell me more about that Edelbrock RPM package. What was the cost? I'd really like to look into that for my 351W. Harley ------------------
1970 Mach I
http://www.geocities.com/hh_machi/
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68 S-code GT
Gearhead Posts: 3289
From: Sayreville, NJ, US
Registered: Mar 2000
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posted 04-10-2001 07:15 AM
Your FMX cross member should work with the C$ with no problems. I had a 67 with a 351W and FMX and it had the C4 cross member. The yoke on the driveshaft is different I think though.
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skips69
Gearhead Posts: 346
From: Catlin, IL USA
Registered: Mar 2001
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posted 04-10-2001 10:01 AM
Thanks to all for responding. It sounds overwhelmingly like all are in favor of the C-4 swap. I will create a new post asking for technical information, as well as past experiences with this swap.Harley - The Edelbrock Performer RPM package basically consists of their carburetor, cam and lifter's, dual plane intake and assembled aluminum heads. It is also advised to run no more than 9.7:1 compression pistons and run 92+ Octane gas to get the full benefit. The kit cost about $1500 3 years ago through JEG'S, and is advertised as producing 400 HP and 412 FT Pounds of Torque. It has a very strong power band and winds up to 5,500-6,000 RPM's nicely. As mentioned though, the trans and rear are holding it back. I also run a 2 1/2" mandrel bent dual exhaust with an X pipe and two Flow master stage II muffler's bolted to long header's. It sounds sweet!
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Moneymaker
Administrator Posts: 27660
From: Lyons, IL, USA
Registered: May 99
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posted 04-10-2001 11:19 PM
C-4! ------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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