The tube seals 8 of them, and check ur timing chain guides for signs of the plastic wearing out

And on the outside change ur valvetronic oring, spark plugs, the cam sensor seals 4 of them, and both ccv valves and upgrade to the new ccv tubes

__________________
04 black on sapphire 4.8is personally put 90,000kms
fully loaded minus the fold out trunk floor
-20' DUB X10 3 piece rims staggered setup
-LED angel eyes + interior lights + e70 style shifter
-AFE stage 2 intake system
-x-pipe/resonator delete
-UV coat windshield
-rebuilt Pano roof
-dynavin N6
-all front and rear end suspension parts and both front cv shafts replaced
-OEM hitch

And 2007 GSXR750