this is not at all rare, especially on newer engines that have mild performance cams. in most cases the cause is a small amount of oil leaking past the rings or valve seals, especially if the heads you installed were not equipped with new valve seals. theres a good chance reversion pulses are causing a fine oil mist, from oil getting past the valve seals, valve guides or rings, during the cams low speed operation (idle) too be sucked back into the intake plenum keep in mind REVERSION PULSES in the intake can spread oil over the runner and plenum in some cases. many guys see this if they install older heads , on an engine that are basically in good shape but may have minor wear on the valve guides and valve seals, or before the piston rings fully seat and seal.on a new short block , especially , if the engines PCV valve and breather are not functioning at peak efficiency. often installing a breather catch can significantly reduces this, but if your cars engine "LOPES" and "RUMBLES" at idle one of the strong indications that the engine sees some intake charge reversion, at low speeds , its almost a given that their will be minor reversion, and as a result minor oil film on the intake runners. if youve ever installed a longer duration cam in a tuned port engine design, your very likely to find the intake runners show a light oil discoloration as the engines allowing those long runners to draw oil up out of the cylinders at lower idle speeds during the cams over lap timing. you might want to pull a spark plug and use a flex micro cam to inspect inside the cylinder http://www.getlizardcam.com/index.jsp http://www.getlizardcam.com/index.jsp#product_selection https://www.walmart.com/ip/6LED-Wat...0812&wl11=online&wl12=623029814&wl13=&veh=sem this is also a good inspection tool http://www.thetoolwarehouse.net/p-6283- ... pv618.aspx GOOGLE PV-618 and PV-636 High resolution lens provides a clear image of objects as close as 3/4 inch and over one foot away while providing a wide 40 degree field of view. Powerful lamp illuminates dark crevices on-demand with the push of a button conveniently located on the handle. Ergonomically designed handle is comfortable to hold and allows one-handed focusing and light activation. Rugged and water resistant, ProVision is made of high impact ABS and flexible cable sheathing. (Note: Shaft is water resistant, not the handle.) PV-618 and PV-636 models have .23†diameter, flexible, non-obedient cable. Durable carrying case included. Accessories available to optimize ProVision for specialized applications. Made in the USA Specifications: Cable Length: 18" (457.2mm) Cable Diameter: .23" Handle Length: 6" (152.4mm) Handle Width: 1.43" (36.2mm)Overall Length: 24" (609.6mm) Weight of Scope w/ Carrying Case: 1 lb. 5.7 oz (615 g) Field of View: 40° Optimal Viewing Distance: Min. .8" (20mm); Max. is dependent upon ambient lighting conditions. Lamp Volts: 2.7 volts (Halogen) Power Source: 2 AA batteries (not included) Pressure Necessary to Operate Lamp: 2.9 avg. p/psi; 3.2 max. p/psi heres a cheaper version that works with a lap top computer GCA 5.5mm Diameter USB Waterproof 6 Led Endoscope Borescope Inspection Wire Camera (5m) Price: $18.50 & FREE Shipping on orders over $49. Details Waterproof wire endoscope Diameter:5.5mm head, 5 meters long flexible tube High resolution 1.3MP with 1/12" VGA CMO 6 LED lighting adjustable, can be inspected the hard-to-see areas. Waterproof : IP67, 60°Viewable Angle. Can take photo & video and save in your computer a common cause of oil in intake ports is having the heads machined without matched changes to the intake, manifold, and gasket surfaces, but reversion pulses in the intake runners can and do transfer oil from the valve guides and oil mist,getting past piston rings into the intake runners due to reversion pulses read through these links http://garage.grumpysperformance.co...n-cylinder-head-intake-ports.5081/#post-14463 http://garage.grumpysperformance.com/index.php?threads/catch-can-related-info.4636/#post-12610 http://garage.grumpysperformance.co...reather-hole-in-valve-covers.2005/#post-35665 http://garage.grumpysperformance.co...gine-oil-fowling-spark-plugs.7692/#post-53056 http://garage.grumpysperformance.com/index.php?threads/intake-sucking-oil.4891/#post-24722 http://garage.grumpysperformance.com/index.php?threads/detonation-damage.2883/#post-7484 http://garage.grumpysperformance.co...-you-failed-emmision-testing.3522/#post-18430
