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Another improvement was use of a hydraulic lifter/roller camshaft on most 1987 LG4s. Some early engines have lifter retainer provisions, but use the older, non-roller camshaft. 1987 would also be the last year for the LG4 production, however a run of LG4 engines was made to supplement the carry-over production for the 1988 Monte Carlo and the ...
The "351 CJ" high-performance engine included a different intake manifold, high-lift, long-duration camshaft with hydraulic valve lifters, higher rate valve springs with dampers, a 715-CFM spread-bore 4300-D Motorcraft carburetor and a dual-point distributor (only with four-speed manual transmissions - not sold in California).
A hydraulic tappet, also known as a hydraulic valve lifter or hydraulic lash adjuster, is a device for maintaining zero valve clearance in an internal combustion engine. Conventional solid valve lifters require regular adjusting to maintain a small clearance between the valve and its rocker or cam follower. This space prevents the parts from ...
The Ford small-block is a series of 90° overhead valve small-block V8 automobile engines manufactured by the Ford Motor Company from July 1961 to December 2000. Designed as a successor to the Ford Y-block engine , it was first installed in the 1962 model year Ford Fairlane and Mercury Meteor .
A similar arrangement transfers the motion via another roller tip to a second rocker arm. This rotates about the rocker shaft, and transfers the motion via a tappet to the valve. [clarify] Some OHC engines employ short rocker arms, also known as fingers, in which the cam lobe pushes down (rather than up) on the rocker arm to open the valve.
The General Motors LS-based small-block engine family is a popular example of these kinds of OHV V-type engines. Simpler camshaft drive system: OHV engines have a less complex drive system for the camshaft than OHC engines. [16] Most OHC engines drive the camshaft or camshafts using a timing belt, a chain, or multiple chains.