We do not have anything against fuel injection, some people simply dont have the resources to remap there computers and with electronics they can cause reliability issues. First test after initial design were done with speedway teams in NZ. Now modified SOHC Falcon owners in Australia have the benefit also.
The cars owner reported back to us a gained around 20% in RWHP. The owner also commented "best thing is no more computer hassles" when it comes to tuning.
Aussiespeed have a performance manifold to suit most Ford 6 cylinder engines available in both 2 barrel and 4 Barrel there is a manifold to suit your performance upgrade.
It is very important when using Aussiespeed 2 or 4 barrel manifolds that you do not port or enlarge the ports. DO NOT port the manifold at the cylinder head end unless you have extensive experience in cylinder head and manifold development. Our high velocity manifold is designed in such away that cylinder balance is a major key in performance. The volume of the manifold can feed an engine making big horse power and the runner is larger than any Ford six performance manifold available. We did the development and the small port opening will not affect high rpm horse power, it boosts torque, increases air speed to give not only better down low grunt but allows for better breathing in high RPM situations. The 4 barrel Aussiespeed AS0016 Ford xflow manifold has been used on naturally aspirated 250 C.I engines that have produce 400 + HP.
Unlike the Ford Crossflow the 4.0L engine does not respond in the same way as the 250 Crossflow, the 2 manifolds are different as the OHC does not develop the same power down low. The factory throttle body manifold with its even length runners is one of the best factory produced manifolds we have ever had on our flow bench.
The runners flow within 3cfm of each other. The manifold is very restrictive as to produce torque from idle through to around 4800 rpm. These engines are now being fitted to early Falcon and Cortina s with many being used in street stock and modified production. As these classes need to make power from down low to 6000 + rpm we spent many hours producing a manifold that produces torque down low and still out perform the factory manifold in the higher RPM range. The manifold can produce more low down torque when fitted with an AS0241 plenum insert.
Figures from stock 4.0 with Aussiespeed AS0012, E85 4 barrel carb, front mounted intercooler and turbo. Some very impressive numbers with not a lot of dollars out laid 424.3 HP / 316.4 KW. The AS0012 has one x 3/8 npt vacuum take off on the rear of the manifold for brake vacuum and auto transmission fitting.The widest point of the manifold from head face to carb pad is 215mm.
When using an Aussiespeed heat shield something that will make then reusable, use a paper gasket either side with a few small dobs of superglue to hold the gasket in place for easy fitment and removable.
YOU ARE BUYING
AS0241 Plenum Insert
AS0197 head to manifold heat shield
AS0201 6mm squarebore heat shield