| Re: 1969 L-89 - need advice choosing a cam |
Subject: Re: 1969 L-89 - need advice choosing a cam by rklessdriver on 2017/1/25 20:07:02 Hi Coach, Wow. An L89 is a pretty rare and desirable engine in the 69. I'm surprised your dad would want to modify one. Since the L89 came from the factory with Aluminum cyl heads they are already equipped with hardened seat inserts. So honestly you should only need to have the proper valve springs installed and replace any wear items (ie seals or guides) before you install them with the new hyd roller cam. I'd be interested to know what the machine shop you are dealing with told you.... As for converting to a hyd roller cam from the current flat tappet solid lifter. It's a pretty straight forward conversion. You will need the new roller cam, new roller lifters, new appropriate length pushrods and proper valve springs/retainers/locks. I have most of my camshafts ground by Mike Jones at Jones Cam Designs. They are in Denver NC. All Jones cams are custom grinds. http://jonescams.com/ As for specifications given the rest of the engine and your dads expectations. I would recommend these 2 lobe profiles. EHR72360/EHR74365 The entire cam specifications as I recommend it be ground would be: 280/288@.006 234/242@.050 .612/.620 lift w/1.7 rockers (stock rocker ratio) 108 ICL with 112 LSA. This cam would give a very similar sound at idle to the factory L89 cam, better part throttle driveability, more power and no maintenance. For off the shelf camshaft something like the Howards Cams PN 120405-12 would also be a good choice. For the Hyd roller lifters I would recommend Morel PN - 5374 or the Howards Cams PN 91161. For Valve springs, retainers and locks I would recommend Competition Products. PN - VSA14. For Pushrods I would recommend Manley. Pushrods would have to be measured for the proper lengths once the cam, lifters and cyl heads are installed. Of course you would need new head gaskets and intake gaskets. Some silicone and possibly carb gaskets. I'll be glad to answer any other questions you may have about my recomendations or help you with your project in any way I can. R/S Will |
