Please restate the question by describing the problem you're having. Vortec engines weren't invented yet in 77, and "dress up" has no meaning in this context.
how do you set valve on 1998 350 vortec
Chevy 350 small block engines with hydralic lifters set at 0 lash. That means start the engine and adjust the valve until it just quits clicking. Then tighten the nut approx 3/4-1 turn then set the next one.
On the Vortec the computer does it all.
Timing is set by the PCM and is not adjustable.
Timing is set by the PCM and is not adjustable.
That's usually caused by not following the break-in procedure. It's important to get the engine running quickly without cranking the starter much, and get it up to speed right away. If the cam has suffered wear from the lifters not rotating, it will need to be replaced.
Yes .
If it's actually the rockers arms that are "chattering" while the engine runs, you may need to adjust the lash. If there are Solid lifters in the engine, you may want to switch to hydraulic lifters and adjust the rockers to the moment of "zero lash". Adjust them in pairs per cylinder while the lifters are in the down position (both valves closed). When you reach zero lash on the rocker arm (the pushrod will suddenly stop spinning freely in your fingers) add an additional quarter turn to the rocker arm nut to set the "pre-load" of the lifter. This just means that the pushrod will be pushed down slightly in the spring loaded hydraulic lifter and when the engine runs, the oil pressure will keep pressure on the lifter and thus the rocker arms will run silently. More detailed info at BoxWrench.net if you need it...
You will need an after market Vortec Intake None FI 4BRL set up. The vortec engine has longer runners to increase air speed for the vorteciy action of the heads.
96 up u can`t. done by the computer
There is no valve adj on a 4.0l it has hydraulic valve lifters.
this car has self set hydrolic lifters.