Mechanical Lifters

YKRANDY

MEMBER
CHEVROLET TRUCK

I'm having problems adjusting the mechanical lifters. The engine is a 350 cu inch. In a 84 GMC 4x4 1/2 ton. It has an edlebrock carb and intake, with headers. The engine was rebuilt by previous owner.
Mileage is about 10,000 to 12,000 miles. There are adjustment screws on the rockers but I need to know how to adjust.

Thanks
YKRandy

1 Reply

E40WATER12

MECHANIC
522 POSTS

My guess is youre rocker arms have slot pit screw rockers, You will also need a wrench and feeler gauge, I am not sure what the spec are on the feeler gauge, Best to get or look into the haynes repair manual, First with the valve cover off, (Youre gonna need another one). Also with the wrench youre gonna need to undo the nut W/ slot (flat head screw driver) To undo the nut. Then add the feeler gauge to the right measurements, Then place them in between the rocker roller arm & the cyl spring seat, Then tighen the slot pit screw, This is the important part, Now u want to have the slot pit screw only tight enough, So that the feeler gauge can roll out easily through the rocker roller, Once its at the correct tightness, With youre wrench tightn the nut up, Also recheck the rocker roller, Again to see if its still correct, If so continue onw with the others in the same way.

Good Luck.