I have two 440 type(one 452 and one 464 C.I.)motors with comp hydraulic cams, one XE285HL on iron heads with 1.6 ductile iron rockers and one XE295HL on Eddy RPM with Harland Sharp 1.5 ratio rockers, niether one seem to be noisy to me I did use the standard Comp hydraulic lifters(not Pro Magnum ) and I use 1/3 to 1/2 turn preload when hot I'm assuming by noise you mean valve train noise and not the rumpty rump noise of the cam in the exhaust