#2 cylinder tube has clearance issues with the 45 degree spark plug boots, so use spark plug wire set with 90 degree plug boots. On the Mark II, you will need to dimple the driver's footbox a little as cylinder #8 tube hits it.
There are Ford Motorsport headers that do fit better and dont' have above problems, but they are expensive (about $350).
If you are talking about unequal length then you may get some interference on the driver side on #8 cylinder where it just kisses the aluminum. I fixed this by inserting a piece of 3/4 chassis square tube lower down to spring the aluminum away from the exhaust.
I have the equal length bbk's and there is a slight interferance with the drivers side engine mount. I just dimpled the header a little. Comes close to the footbox, but does not touch.
Shep Qualified old guy. Dad of Willspeed. 89 Donor.Mk. III IRS, 302,equal length headers, 65 mm throttle body 77 mm MAF,Kenne Bell Supercharger,Levy bump steer kit & Koni Shocks.Finish line nudge bars, Cobra Earl Trunk, FFMetal batbox and footbox,APE hardtop, Vintage A/C, Lucas windscreen washer. Detailed, painted, graduated. Driving, adding stuff.
Originally posted by sgspeed: I have the equal length bbk's and there is a slight interferance with the drivers side engine mount. I just dimpled the header a little. Comes close to the footbox, but does not touch.
Same headers here except I modified the motor mount (Energy Suspension brand) by cuttnig off the top of the clam-shell where the bolt goes through and welded it back together.
Also - I wrap my headers with DEI header tape and use 90 degree boots.
Regards - Randy Racecar Fab/Support GT40 331 - Weber IDAs, G50 5spd 69 Camaro SS 4spd 2007 Toyota Camry Hybrid - 44.2 MPG daily driver 2002 Avalanche 2500 - Avian Target
My GT-40 Build Site: http://www.GT-FORTY.com
Welcome to FFCars! The
representations expressed are the representations and opinions of
the FFCars.com forum members and do not necessarily reflect the
opinions and viewpoints of the site owners, moderators, Factory Five
Racing, Inc. or Ford Motor Company. This website
has been planned and developed by FFCars.com and its forum members
and should not be construed as being endorsed by Factory Five
Racing, Inc. or Ford Motor Company for any
purpose. "FFR", "Factory Five", "Factory Five Racing", and the
Factory Five Racing logo are registered trademarks of Factory Five
Racing, Inc. FFCars.com forum members agree not to
post any copyrighted material unless the copyrighted material is
owned by you. Although we do not and cannot review the messages
posted and are not responsible for the content of any of these
messages, we reserve the right to delete any message for any reason
whatsoever. You remain solely responsible for the content of your
messages, and you agree to indemnify and hold us harmless with
respect to any claim based upon transmission of your message(s).
Thank you for visiting the FFCars.com Forum dedicated to Factory