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Jul 21st, 2025 | | | | Joined: Oct 2011 Posts: 117 'Bolter | | 'Bolter Joined: Oct 2011 Posts: 117 | What is the best way to adjust the valves on a 250 chevy. I am rebuilding the engine. I have done several 350s but not the 250 | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Does it have ‘juice’ lifters?
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | 250's have hydraulic lifters, so they're adjusted just like a small block V8. Get each cylinder to top dead center on the compression stroke, gently take the slack out of the valve train by spinning the pushrod as you tighten the adjusting nut, and add an additional 3/4-1 turn of the adjusting nut after the slack is taken up. Adjust both valves, then move on to the next cylinder in the firing order. I use the companion cylinder valve adjustment method, but nobody else seems to be interested in doing it that way.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Feb 2000 Posts: 4,886 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 4,886 | If the lifters are dry or have been setting a long time, the feel for zero lash is a littler harder to find. There is little resistance in the lifter when not oil filled, it can be done, just takes a little more care. | | |
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