How do I set my preload? · Help Center - Summit Racing
Lifter preload is the distance the pushrod seat moves down away from the retaining lock. This specific amount of space allows hydraulic lifters enough space to move. Preparation. To properly set preload, the lifter must be located on the base circle of the cam lobe. At this position, the valve is closed. There is no lift taking place.
Hydraulic vs. Solid Lifters · Help Center - Summit Racing
Hydraulic Lifters automatically adjust. They have a spring-loaded plunger inside. As the engine runs, the body of the lifter fills with oil. The spring and oil allow the plunger to move up and down as needed. A hydraulic valvetrain is quieter and basically maintenance-free. However, it needs to have a certain amount of preload set when installed.
How do I install a new camshaft? · Help Center - Summit Racing
Install a Solid Lifter or Hydraulic Lifter in the #1 intake lifter bore. Be sure the type of lifter (Flat Tapper or Roller) matches your cam. Install the pushrod and rocker arm on the intake valve. If using hydraulic lifters, be sure to use an Adjustable Pushrod to keep valvetrain geormetry the same. Set valve lash and preload, as appropriate.
How do I break in my roller camshaft and lifters? · Help Center
Set the Valve Lash or Preload as recommended by the manufacturer. Prime the Oiling System. Set the Initial Ignition Timing. For carbureted engines, make sure fuel bowls are full and any air is bled from the fuel lines. Start the engine and immediately raise rpm to 3,000. Vary rpm between 1,500 and 3,000 for the next 20-30 minutes.
Valve Spring Pressure - Hydraulic Roller · Help Center - Summit …
Always use Screw-In Rocker Arm Studs with a hydraulic roller camshaft. The higher spring pressures will loosen press-in studs. Spring pressure over 360 lbs. require billet lifters. Stock, cast lifters will crack under high spring pressure at high rpm. Most manufacturers will recommend valve springs to go with each cam they make.
Category · Help Center - Summit Racing
Lifter preload is the distance the pushrod seat moves down away from the retaining lock. This specific amount of space allows hydraulic lifters enough space to move. Preparation To properly set preload, the lifter must be located on the base circl...
Chevy L87 Engine Specs · Help Center - Summit Racing
Engine Block Specifications: Part Number: 12619171: Material: 319-T7 Aluminum: Displacement: 6.2L / 376 c.i.d. Bore Dia. 4.065 in.
Valve Spring Pressure - Hydraulic Flat Tappet · Help Center
Engine Type Seat Pressure Open Pressure; Stock Small Block: 105 - 125 lbs. 220 - 280 lbs. Moderate Performance Small Block
What is a pedestal mount rocker arm? · Help Center - Summit Racing
A Pedestal Mount Rocker Arm has a pivot point that is bolted to the cylinder head. In some cases, the head may have a pedestal machined into it.
How do I lock my rocker arms? · Help Center - Summit Racing
Set the Valve Lash or Lifter Preload by turning the outer hex nut (polylock body). Loosen the outer hex nut approx. 1/16 of a turn. Tighten the set screw. Tighten BOTH the screw and nut together until they jam and become much harder to turn (25-30 ft.-lbs). The outer hex nut should be back in the same place it was before you loosened it.