Small-Block Chevy Valve-TrainArticle by mark Trotta

All Gen-1 small-block Chevy"s have actually the exact same valve-train assembly. The components include lifters, push rods, rocker arms, rocker nuts, and rocker balls.All contents get lubricated prior to assembly.

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During reassembly, provides needed encompass moly lube ( the same stuff you usage on the camshaft) and a squirt have the right to of motor oil. This is important so the there will be no bare steel rubbing ~ above metal during start-up.

Install Lifters

Most SBC rebuilds encompass camshaft and lifter replacement. If the lifters room new, they can go in any type of order in the block, however if you"re re-using the old ones, they have to be put back in the very same bore they came out of. If you put used lifters earlier anywhere, they"ll wear out much quicker once the engine is running again.

On every engine build, parts go from revolution to running. This is why it"s essential that throughout re-assembly, all parts are lubricated. Usage the same kind of lubrication that you use on the electronic came lobes top top the bottom of the lifters. Oil the political parties of the lifters with motor oil. The lifters have to drop best in.


Install push Rods and Rocker Arms

If you supplied a valve-train organizer tray, place it close to the engine.Like the lifters, old push rods need to go ago to the spot castle ran in.Put a dab of assembly lube on each end before installing.

The #461 castings top top this 327ci engine space pre-guide-plate heads. Guide-plate heads have big round holes as the plate keeps the push rod positioned.On at an early stage small-blocks, a rectangle-shaped hole v semicircle is all the was used.


Before the rocker arms go ago on, lubricate the side wherein the push rods sit, the advice of the press rods and the advice of the valves.


Lubricate the rocker balls too, before you put them in.I"m upgrading come grooved rocker balls, i m sorry hold extr lubrication for better protection versus galling. Tighten the rocker nuts just finger-tight because that now.

Valve Adjustment

Adjusting valves with hydraulic lifters walk not call for shimming and is fairly simple. Hydraulic lifters contain a tiny hydraulic piston, i beg your pardon is pressurized by engine oil.The piston acts as a hydraulic spring that automatically adjusts the tappet clearance according to the oil pressure.This makes the valve actuation self-adjusting and also there is no should shim the rockers.


Hopefully, friend left the engine on top Dead Center before you installed the cylinder heads. If not, usage a breaker bar and also socket and turn the harmonic balancer so the the "0" mark lines up through the timing tab. To check that you are on #1 cylinder, the lifters ~ above #6 will certainly be rocking (intake just opening and also exhaust simply closing).

With the engine at the TDC, tighten the rocker eight nut top top cylinder #1 only until the slack between the rocker arm and push pole is gone.Then tighten 1/2 turn more.

Next, revolve the engine 1/4 clockwise (facing the former of the motor) therefore the #5 cylinder lifters space rocking. This is TDC top top cylinder #8.Repeat the over procedure. Continue transforming the balancer 1/4 in ~ a time, and readjust cylinders 4, 3, 6, 5, 7, and also 2.You will revolve the balancer about twice and also make four stops each happen (2 x 4 = 8 cylinders).

Be careful not come over-tighten, all you need to do is take the play the end of the push rods, and the little hydraulic piston in the lifter takes up the rest.

You will quickly see a sample emerge. Remember the first-gen SBC Chevy"s use a firing bespeak of 1-8-4-3-6-5-7-2,each cylinder gets adjusted when the valve-train is 180 levels out. Example: cylinder 1 gets readjusted while 6 is rocking,cylinder 8 gets adjusted while 5 is rocking, etc.

Valve adjustment Order for SBC

Adjust this cylinder - once lifters on this cylinder room rocking.

1 ------------ 6

8 ------------ 5

4 ------------ 7

3 ------------ 2

6 ------------ 1

5 ------------ 8

7 ------------ 4

2 ------------ 3

After every 16 rocker arms are adjusted, bring the engine back to TDC (#6 lifters rocking again).This is wherein you need to be because that the next step in engine reassembly - installing the distributor.

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Read: Small-Block Chevy Build


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