Mustang Forums - View Single Post - Anyone intrested in 5.4L swaps, in here. Need you to opine.

r3dn3ck · 03-13-2006, 09:53 AM

whitethunder is correct. Basically the only thing you're changing is the bottom end. The intake is the same (hopefully you're using a mustang intake cuz it's much easier that way) and all you need to make it work is a set of plates. RR only made 20 sets so get them while you can. There's another company working on a plate design and they'll have them out shortly from what I understand.

The exhaust needs to be widened at the H/X pipe to allow it to mate properly to the manifolds. This usually costs about 50-150 bucks for an exhaust shop to do. It's pretty easy but requires light welding on the mid-pipe. Wires should all fit but a couple may need extending or re-routing (usually not).

Other than that this is a pure bolt on.

To make it run nicely you really need to have a tune done. The extra cubes make it run less than perfect with a tune for a 4.6 on it. To make maximum power you need to add duration to the intake side of the cam and balance the exhaust side and LSA for that. Even an off the shelf cam like Comp or VT makes would be nice.

Other considerations existy but are all optional. A fuel pump wouldn't hurt. A set of 31 spline axles and a 31 spline diff would be nice. A stronger than stock tranny like a built T5/T45 or a TKO or T56 would be nice. Otherwise realize that you can frag a tranny with that much power and try not to. New U-joints couldn't hurt. A cobra brake kit, I consider mandatory. heavier front springs for stock suspension cars isn't a bad idea either (03 cobra front springs will have the perfect rate for a stock ride).

FLstang: read the whole thread and you'll discover lots of information you've missed. It's a good idea for this thread.

Swap Update: I just cleared the cash to get some really nice H-Beams so I'm going to tinker with my build plan and change the cams a bit. I had been planning to use a grind that tops out around 5500 but now that RPM isn't a problem in the bottom end I'm spec'ing cams to be good to around a 6500-6800rpm redline. I'll only ever use that extra RPM at the track but it's nice to be able to get past 5500 without worrying about snapping a rod.

03-13-2006, 09:53 AM	#66 (permalink)
r3dn3ck Wowbagger hates me too! Join Date: Nov 2005 Location: Magrathea/California Posts: 6,677	whitethunder is correct. Basically the only thing you're changing is the bottom end. The intake is the same (hopefully you're using a mustang intake cuz it's much easier that way) and all you need to make it work is a set of plates. RR only made 20 sets so get them while you can. There's another company working on a plate design and they'll have them out shortly from what I understand. The exhaust needs to be widened at the H/X pipe to allow it to mate properly to the manifolds. This usually costs about 50-150 bucks for an exhaust shop to do. It's pretty easy but requires light welding on the mid-pipe. Wires should all fit but a couple may need extending or re-routing (usually not). Other than that this is a pure bolt on. To make it run nicely you really need to have a tune done. The extra cubes make it run less than perfect with a tune for a 4.6 on it. To make maximum power you need to add duration to the intake side of the cam and balance the exhaust side and LSA for that. Even an off the shelf cam like Comp or VT makes would be nice. Other considerations existy but are all optional. A fuel pump wouldn't hurt. A set of 31 spline axles and a 31 spline diff would be nice. A stronger than stock tranny like a built T5/T45 or a TKO or T56 would be nice. Otherwise realize that you can frag a tranny with that much power and try not to. New U-joints couldn't hurt. A cobra brake kit, I consider mandatory. heavier front springs for stock suspension cars isn't a bad idea either (03 cobra front springs will have the perfect rate for a stock ride). FLstang: read the whole thread and you'll discover lots of information you've missed. It's a good idea for this thread. Swap Update: I just cleared the cash to get some really nice H-Beams so I'm going to tinker with my build plan and change the cams a bit. I had been planning to use a grind that tops out around 5500 but now that RPM isn't a problem in the bottom end I'm spec'ing cams to be good to around a 6500-6800rpm redline. I'll only ever use that extra RPM at the track but it's nice to be able to get past 5500 without worrying about snapping a rod.