Guest V8Z Posted September 22, 2006 Share Posted September 22, 2006 Are the "retro" hydro roller cams a direct replacment for 1986 and down engines with no mods nessasary? And what is exactly the differance between a retro and non retro cam?? Lobe size, cam journals, what???? I have search a few forums and I know a non retro cam can be put into a pre 1986 block but you have to replace the timing chain, rig some stuff up to keep it from walking ( cam button and i think the timing cover). Has Anyone here, say put a ZZ4 hydro roller cam in a 1986 down block? Quote Link to comment Share on other sites More sharing options...
Guest V8Z Posted September 22, 2006 Share Posted September 22, 2006 anyone? Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted September 23, 2006 Share Posted September 23, 2006 The major change on the good quality retro fit roller cams are the lobe design and the lifters used, the timing set is the same or at least can be,the retro hydrolic roller cams like CRANE and CROWER sell are basically a drop in and run deal, the only changes are the addition, of a cam button becomes mandatory and the pushrods are a differant length, now be aware that some cams come with a steel vs cast steel gear and require the use of a differant distrib gear. keep in mind that youll want to use the matching springs and check the clearances, and that roller rockers are almost mandatory with the faster ramp accelleration rates and higher lifts. READ THE INSTRUCTIONS, and buy the complete KIT,springs,roller lifters,retainers ETC. if you don,t buy all components from ONE manufacturer they will ALWAYS blame the MIS-MATCHED components for any problems and void the warranty http://www.idavette.net/hib/camcon.htm Quote Link to comment Share on other sites More sharing options...
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