Cerbera Cam timing

[350Matt]

For those who've asked on a now to do it I thought I'd post this as extracted from the works manual

If cam timing adjustment is required proceed as follows; turn the front pulley until, the front 2 cam followers are on the overlap (inlet just opening, exhaust just closing) remove the uppermost cam sprocket bolts. Turn the front pulley clockwise until the back 2 cam followers are level, and then carefully turn the crank clockwise slightly more until the inlet cam follower is exactly 1.5mm lower than the exhaust
DO NOT TURN ENGINE BACKWARDS DURING THIS OPERATION

Now scribe the camshaft and camshaft sprocket with a line exactly level the top of the cylinder head, a carbide tipped scribe may be required.
Now remove the remaining cam sprocket bolts and fit the cam sprocket retaining tool ( a bar with a spigot on it to keep the sprocket in place which bolts to the cylinder head)

Now turn the crankshaft anti-clockwise until the camshaft has moved 1 & ½ teeth if working on the odd cylinder bank, or clockwise if working on the even cylinder bank.
This puts the engine in a safe position so no valves are bent when removing the camshaft. Slacken the timing chain tensioner but do not remove it then slide the cam sprocket off the cam and onto the spigot of the retaining tool.
The cam caps bolts cam then be slackened evenly and then removed the cam can then be removed, remove any of the tappets which required adjustment and remove the ‘top-hat’ shim underneath. Measure the shim with a micrometer and replace with one of the appropriate thickness to provide the correct clearance ( 0.010” on the exhaust and 0.008” on the inlet)
The camshaft can now be replaced and use plenty of engine oil to lubricate all parts during reassembly, while the crankshaft is in the ‘safe’ position the cam can be rotated safely to check all clearances, repeat adjustments if required.
When complete torque all cam caps to 17ft/lb and turn the cam until the scribe marks match on the head and pulley at this point the cam bolts can be de-greased with solvent, apply loctite thread locking compound to their threads and refit, torquing to 20 ft/lb, retighten cam tensioner and secure with lockwire.

Turn the crankshaft 1 revolution and refit the other 2 camshaft pulley bolts loctiting as before

A couple of things to add are

Jools reccommends timing the cams up at equal lift on overlap, I found this to work well.
I think valve clearances were opened up a little over the engines life to 10" inlet 12" ex
I made up a spark plug stop (drilled out middle of a plug and fitted a bolt) to allow me to fit a degree wheel and find out exactly where the timing really is.