Should I change the timing chain and gears on my L79
03-07-2012, 03:32 PM
#22
Drifting
03-07-2012, 08:13 PM
#23
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Ding Ding Ding we have a winner!!!You were right...Ok old stuff is off new double roller is on 
You were right I did have to clearance the block on the top area right behind the cam gear and on one of the large plugs that was sticking out and alittle close so I took some off of that as well.I gave the timing chain approx .030 clearance at its closest point to the block.Do you guys think thats enough I read most cams only have /should be .008 end play,it didnt feel like I had any.I couldnt torque it down though because stupid me forgot to buy thread locker for the cam sprocket bolts which I have been told you have to use.Oh and by the way all plastic teeth were intact but there were 5 good size hair line cracks and atleast 10 small hairline cracks. So all of you who have not done this to your L79 you should all tear them down this weekend and do it because all who said the days are numbered are correct Its actually kind of a fun and easy job. I took pictures allong the way some day when I get time I will post them...Thanks to all who posted.....Dave
You were right I did have to clearance the block on the top area right behind the cam gear and on one of the large plugs that was sticking out and alittle close so I took some off of that as well.I gave the timing chain approx .030 clearance at its closest point to the block.Do you guys think thats enough I read most cams only have /should be .008 end play,it didnt feel like I had any.I couldnt torque it down though because stupid me forgot to buy thread locker for the cam sprocket bolts which I have been told you have to use.Oh and by the way all plastic teeth were intact but there were 5 good size hair line cracks and atleast 10 small hairline cracks. So all of you who have not done this to your L79 you should all tear them down this weekend and do it because all who said the days are numbered are correct Its actually kind of a fun and easy job. I took pictures allong the way some day when I get time I will post them...Thanks to all who posted.....Dave
03-07-2012, 08:20 PM
#24
Race Director
You could well have been 1 downshift away from a new motor or it may have run with all those hairline cracks for another 50,000 miles. Hard to say.
03-07-2012, 08:27 PM
#25
Racer
No way....it will all fit no need to mod anything.
03-08-2012, 09:57 AM
#28
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So befor I clearanced the block.I put a .003 shim inbetween the chain and the block and then I pushed in on the chain and it rode hard on the .003 shim.Thats like the thickness of a piece of paper or less,to close for me.It may have worked but I dont know how much cam walk cams have while the engine is running. I read they should have no more then .008 max. So I gave mine .030 clearance just incase.Also i'm using the stock timing chain cover to keep my engine looking origonal so i dont have a cam button to adjust like on my 427 Chevy Nova.
03-08-2012, 09:58 AM
#29
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