Iowa Chapter Director
Join Date: Jul 2002
Location: Ames, Iowa
personally, I'd rather get a camshaft from the people that know. Granted, CompCams has a lot of experience with cam profiles, but they are very new to the Ford v6 market. SuperSixMotorsports.com MoranaV6Racing.com RPM-Mustangs.com have all been in the game for years researching and developing the best ways to get performance out of these engines. They know the best cam profiles, what works and what doesnt. These places can buy the untouched core from CompCams and grind their own profiles on it. If you really want a billet cam thats the way I would do it.
From what I've read, no clearancing is needed for the 4.2 crank in the 3.8 block, but I would get it doucle checked anyway.
4.2 pistons are different than the 3.8, and the rods on the 4.2 are the same as the 96+ rods. Since the supercoupe stopped in 95, this means the rods are also different. You could use supercoupe rods, but you would need custom made pistons to fit the 4.2 deck height. I would just get a set of forged i-beams and forged pistons. This way you know it's all good, and you have new stuff in there that can handle what you want them to.
a t-5 swap is possible, but the shifter will need to be moved back somehow, otherwise it'll come through in the middle of your dash. An m5r2 swap would be easiest as it goes right in. The tunnel doesnt really matter, but you will need the appropriate length driveshaft for whichever route you choose. If you go with the m5r2 all you'd need is a driveshaft from a 5spd supercoupe. A t-5 swap would require a custom length driveshaft.
Mustang shorty headers will work on the tbirds with modification to the driver side collector. Heat it up and pound it in to clear the steering shaft. With the steering shaft joint mod you should be able to clear the long tubes, but after spending the money on the steering shaft mod, you could have bought direct fit kooks headers (sold by supercoupeperformance.com for the supercoupe).
1988 Notch Mustang: - 438W, direct port n2o, t56
2003 SVT Focus: - SCT X3 tuner