Swapping VT Heads

[sidquick]

G'day all. Ive been trolling this site allot recently and have found it to be very usefull, so thankyou. ive never worked on an engine like the gm ecotec v6 as my background is in bikes with over head cams, or double over head cams.

anyway to the point, i have a 1988 hilux 4x4 that i am swapping the engine out for the commodores (am flat out getting a speeding ticket in a school zone lol) i bought a VT that was on gas for 2500 then bought one that was t-boned for 600. i took everything from the heads up off the gas vt and put it on the block i took out of t-boned one and did the reverse with the other. the car runs fine now allthough now that im assemballing the block i have found that all the valves are compressed when i tighten the rockers up, ive never worked with pushrods, so how the hell do you time them?



sorry for my ignorance,

cheers, sid

[Munz]

have you torqued it to the right specs

[cander24]

Hi Sid. Have you removed the front timing cover and timing chain? If not then you don't need to worry about timing it. If you have then all you need to do to time the stock setup is to align the timing marks on the cam and crank gear. Mark sure you're turning the motor over in a clockwise direction to allow the dampener to take up any slack when doing this.
Re: tightening up the rockers, this is normal. The ecotec has hydraulic roller lifters between the cam and the pushrods. So when fitting the rockers you will find some will compress the valve spring a bit, where as others will not. Idealy, to get an accurate torque on the rocker bolts, you should rotate the crank a little so that you tighten each rocker when it is running on the base circle of the cam (i.e. no lift). Tightening this way should see about a 3/4 turn crush/preload on the lifter.
Hope that helps.
Cheers

[sidquick]

thank you very much cander that would be it , and yes everything is tourqued to specs