C.O.M.E Racing
Mechanic in Glen Eira

However, there is no substitute for experience in wise how to fully interpret flow figures relative to port runner volume, engine capacity, cylinder bore size, valve diameters and much more. Basically, we suggest customers use flow numbers as a guideline as to what is possible. We are glad to donate our opinion of what someone can realistically expect from a given pair of heads on a given engine combination. Port flow relative to port volume at ALL VALVE LIFTS, not fair peak lift flows will determine how well the engine accelerates the vehicle it is in. stoker upgrades for Holden V8's entail a clearance grinding process to ensure the longer strokes and additional con rod swing clears the main bulkhead and water jacket casting area in the base of the crankcase. ALL cylinders must be checked to ensure clearance is sufficient for the swing of the longer stroke crank kit to be fitted. This is particularly critical if lengthy strokes are worn along with H beam rods. Valve seat cutting in cylinder heads is a critical process to ensure best possible air flow, uppermost valve seal and longest conceivable service life. Valve seats must be cut as concentric as feasible to the valve guide cent reline meaning valve guides need to be new, ideally prior the seats are cut. mufti angle seat angles and widths for different applications will bear the optimum results needed. Valve seat cutting must be done in unison with valve guide replacement or checking to ensure the guides are round, straight and fully serviceable. Valves with no real wear on stems can be refaced on their mating faces to the newly restored and cut seats. Once the crank is corrected, extremities like harmonic balance and then flywheel clutch assemblies are individually fitted and spun to ensure they are in balance. NOTE: In some in line engines, particularly motorcycle engines the factory balance shaft assemblies are critical to vibration reduction and harmonics. Many racers in notable have a habit of removing these and strict vibration is the result despite the fact that the crank is in perfect balance on the balancing machine. There is often a mistake made when purchasing a camshaft. Most people buy the largest one in a catalogue or the one the local speed shop has been trying to get rid of for years. Regrinding or re profiling a flat tappet cast iron camshaft is very often a viable and below cost option to simply buying a new camshaft. If the clever lobes are not worn to the point of no return regrinding is totally feasible as the heat treating on maximum cast iron billets extends very deep into the core material. Main bearing bores where main bearings sit holding the crankshaft in store must be perfectly aligned with one another, the correct size to ensure sufficient bearing crush and have a viable surface conclude cranky hatch to effectively aid retain bearings, dissipate heat from bearings and thereby permit the crank to turn with least friction. Base line, we machine the parting line of your main bearing caps to diminish the diameter of main tunnels. Provides a perfectly perpendicular surface which is at exactly 90 degrees to the main bearing tunnels. Provides the right piston to deck height specification for the given compression ratio needed. There's more to it than just a skim of the decks to orderly up and straighten the deck surfaces.