CB®44x37 race port Flow chart * Include 3 angle valve job. 60,45 and 30 degrees. The 60 is hand blended into the port forming a    smooth funnel like blend. * The intake valves receive a hand back cut to  increase flow. * The chambers are reshaped for  hi-squish. If you run less deck this will results in a more efficient burn. * Only shouldered silicone bronze guides are used. You don't need race guides with these ports!! * Special dual springs and my retainers and keepers,  * The retainers  offer  more installed high and the keepers do not rock inside the retainers. * The springs and retainers have been tested and proven, on and off the track! * The highest quality yet still light weight stainless steel valves are used. * Two sets of gaskets are perfectly matched to the ports, * Each of the barrels surfaces is laped-in and checked for flatness. * The chambers surface edge and spark plug hole is deburred. This is to insure that detonation   can not occur. * Type 4 style exhaust ports. 1 1/2",1 5/8" or 1 7/8" ID . * Cc's figures are FREE!! * Your motors compression figures are calculated for FREE!! * The compression chasing is FREE!! (this means that you tell me the total deck and compression you want to run and I will fly cut the heads to the desired cc and reach that compression for you) * Each spring  is shimmed according to your cam & rocker specs. "Example" fk10=has .383 lift @ the cam X 1.45 rockers = .555 lift @ the valve. I would set at: .655  or .100 over total lift. This is needed to receive the maxim life and valve control out of your valve train. * I will match your manifolds up-to 3" inside the manifold for FREE!! or you may purchase a pair of manifolds. * You have  lots of options with the race heads, springs, retainers, valves, work the manifolds etc. E-mail me for info:aj@skylineauto.com   Order here