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There are no " Marks" to line up. There is a h whole set of alignments you have to do. The engine needs to be at TDC. there are colored links on both the secondary timing chains that align with A. the holes on the Idler sprocket, 4 O'clock & 8 O'clock. and B. with the cam sprockets having the V8 at the top of both cams the colored chain link aligns with the R or L of the corresponding Right or Left cam. This all needs to be done in proper order at maintain proper valve timing. failure to do so will end up with possible valve to piston damage. It is better to get the book on the truck for $25.00 rather than do hundreds in damage. You can even get DIY subscriptions online delivered right to your computer instantly for about $20.00 Sorry I type way too slow and would take me all night to tell you exactly how to do it. But if you are engine savvy and have good knowledge as to slack on the timing chain goes on the return side of the chain to cam from crank, (tensioner side) reset your tensioner & pin before you install the chain tensioner. you can do it.
yes the silverado's have timing chains, just about all v6's and v8's have timing chains, and timing chains should not be serviced, unless you are having problems with a timing chain guide or timing chain tensioner
have a compression test done if there is no compression on either bank. pull the valve covers and check the chains all appear tight with
tensioners appearing normal.
sorry that maybe I might be the bearer of bad news but it could be the Nikasil bore coatings have failed. To test this, remove the
plugs and squirt a small amount of oil in each plug hole. Reinstate
the plugs and then see if it starts. If it starts it confirms the
Nikasil failure. The oil down the plug holes is just a temporary
1998 to 2001 Jaguar XJ8 have a big engine design problem, timing chain tensioners are made out of plastic, and with time they brake ,causing big Damage to Engine, if you buy the car make sure those tensioners are replaced to a next generation tensioners wich are way better(made with some metal) as per gas consuption, about 16 miles per gallon in the city and 22 in the highway.
Unless the timing chain suffered a catastrophic failure, ie broke into many pieces, you should not need to replace the cam and crank gears, the tensioner arm and tensioner. The timing chain and guide I can agree need to be replaced, but without a physical examination, you can't just say "replace all these parts". If you do let this mechanic do the work, insist on him giving you ALL the old parts. Then take them to another shop and ask their opinion. You may find the mechanic is honest, but I suspect not.
I'm not sure what model your Jag is but, for the XL8+ there is a TSB/Recalls (Technical Service Bulletin) for:
NOISE DURING START UP - INSTALL REVISED TIMING CHAIN TENSIONERS:
Some vehicles within the above VIN range may experience a rattling noise when the engine is started. This noise may be caused by the secondary timing chain tensioners. Research has shown that a noise can originate at the chain tensioners to cause a resonance in another part of the engine.
A revised, spring assisted, secondary timing chain tensioner has been introduced to eliminate this concern, commencing at engine No. 98102106XX. Introductory VINs are not yet available. In case of a customer complaint, the revised tensioners may be installed on earlier V8 engines.
But then again, I'm not sure exactly of your model, if you get back to me with the exact model, I can check for any TSB/Recalls for you :)