Valve Adjustment on 1994 Chevy Silverado TBI 350?

Question

I wanted to know how to adjust the valves on a 1994 Chevy Silverado TBI 350 with the motor running. I can hear the rockers when I accelerate, mostly on the freeway but not as much at lower RPM's. I have looked up some information on the web and some info states to give the lifter an extra 1/2, 3/4 or a Full Turn after clatter stops. What is the proper way for this motor? The heads are stock but the block was decked .10 if this makes any difference.

Answer 1

They ARE hydraulic- but still require adjustment. If you adjust with the engine RUNNING- have a valve cover installed with the top cut off of it or you will get oil EVERYWHERE! but yes- once the noise stops- 1/2 to 3/4 turn PRELOADS the hydraulic lifter and allows the lifter to do any further adjustment. If you do it with the engine OFF- adjust the rocker nut until the pushrod has no movement up or down with that valve fully open- then tighten 1/2 turn. Each rocker needs to be adjusted with the valve in the fully closed position- which means rotating the engine by hand.

Firing order is 1-8-4-3-6-5-7-2 if you get 1 to TDC- adjust intake and exhaust- turn the crank 1/4 turn adjust 8 turn engine 1/4 turn adjust 4 etc...



Are you sure you aren't hearing an exhaust leak or spark knock? Try some premium fuel- if it goes away it's pinging- retard the timing 2 degrees at a time until it stops- or run better gas.

Answer 2

Chevy 350 Valve Adjustment

Answer 3

Yes, any small block Chevy needs to have the rocker arms adjusted with the motor running. Adjusting them with the engine off is for INITIAL ASSEMBLY ONLY!



Go to chevyracers link, specifically the section titled "Engine RUNNING Hydraulic Lifter Adjustment:".



As far as the mess, an extra valve cover with the top half cut out in a scallop helps to keep oil from running off the lower sides. That is, cut away the upper part, but leave the lower side AND the ends intact. Just cut away enough so you can get at the rocker arm nuts and above.



And go to any racing shop or maybe special order from your typical discount parts store, and get some oil deflector clips (called restrictors in the article, not the same thing) to put on the rocker arms. This helps keep the pressurized oil from squirting out all over, as the rocker arms are lubricated through the hollow push rods.



Like this;

http://www.amazon.com/gp/product/B000BW8VK8/ref=pd_lpo_k2_dp_sr_1?pf_rd_p=486539851&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B000COS6BY&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=0JXMWG6DE5C9GQRZ8YJ5



If you don't have a mechanics stethoscope handy, a plastic transmission fill funnel with the big end to your ear works pretty good.

Answer 4

Sbc Valve Adjustment

Answer 5

You turn the pushrod as you tighten the rocker, with the camshaft on the base circle of that lobe. As soon as you feel drag (practice getting the feel) then you stop, and add your 1/2-3/4 turn.

Answer 6

Jerome... Just stop answering questions. You don't know what your talking about.



Yes his is Hyd. lifters but they are fully adjustable



Here you man. Full details on chevy valve adjustment http://www.centuryperformance.com/adjusting-valve-lash-spg-149.html

Answer 7

those are hydraulic lifters...no adjustment necessary