Aussiespeed Ford AS0016 4 barrel cross flow manifold and AS0012 Falcon 3.9 and 4 litre engine manifold plenum pig insert reduces plenum volume to increase air speed resulting in faster acceleration and better throttle response on mild engines. We have found that some engines respond different due to cylinder head mods, camshafts and gearing .During the development of our range of Aussiespeed Manifolds we have found by changing the shape of the plenum can increases torque, horsepower and make your engine produce better torque at lower RPM.This pig is designed to fit our AS0016 & AS0012 Ford Cross Flow and EA to AU overhead cam engines. The AS0241 AussieSpeed Plenum Pig inserts sit over the top of the existing shaped plenum floor and requires a single bolt hole to be drilled through the manifold floor once the insert is in position,Sometimes trimming of Plenum pig or manifold may be required.
It is very important that the Manifold and Plenum pig insert are absolutely free of contaminants. These include fuel, oil, sand, filings etc. It is a good idea to use a degreaser or cleaning fluid before installation.It is also recommended that the pig & bolt have a small amount of fuel resistant sealer on the bottom. Once installed fuel mixtures will need to be checked, Due to better atomization in most cases your carburetor may require leaner jets. The pig comes drilled & supplied with 1 bolt,washer & nyloc nut.Due to the even flow of Aussiespeed manifolds we suggest that power valve sizes be reduced. We have found that increasing the main jet size by 2 sizes from standard and on some engines going as low as a 2.5 power valve can stop the fuel from laying in the bottom of the manifold & upsetting the air flow.