Engine Top End Archives

Sticking Valves Because Of Carbon Deposits And Rich Fuel Mixture

12/12/2025

The first sign of sticking valves is usually, engine misfires or running rough when cold. However, sticking valves can also be, the byproduct of cold weather operation. In this case, the sticking valves will often […]

Valve Guide Wear – How to Identify and Reduce Oil Consumption

10/25/2025

Valve guide wear, refers to excessive clearance, between valve stem and guide. As the guide wears, the side to side movement, can cause valves to seat improperly. As a result, requiring you to need a […]

Pushrods On G.M. 3.1-3.4 Engines – This Is Where Length Matters

09/26/2025

Exhaust and Intake Pushrods, on G.M. 3.1 and 3.4 engines are different lengths. So, quite often we still see bent push rods and valves, when they are mixed up. Consequently, Exhaust pushrods on G.M. 3.1 […]

Valve Stem Seal Failure: Follow The Symptoms and Conditions

04/04/2025

The purpose of the valve stem seal, is to prevent the oil from the cylinder head, entering the combustion chamber. So, the valve stem seal, plays a critical role in controlling valve lubrication, as well […]

Valve Springs Can Cause, Floating Valves and Pumped Up Lifters

03/26/2025

Valve Springs, have a very basic job, but how they do it, is very important. By the time they have 100,000 miles on them, they have probably lost up to 10%, of their tension. The […]

Automotive Engine Valves: Function, Failure, and Testing

02/20/2025

The main function, of automotive engine valves, is to let air in and out of the cylinders. Above all, the valves in your cylinder head, are a vital part of your engine and undergo, enormous […]

GM 3100 – 3400 Engine Issues: Heads, Manifolds and Rocker Bolts

01/07/2025

GM 3100 – 3400 engine issues, are still happening and are being repeated. We still have leaks, installation problems, as well as cylinder head and rocker bolt issues. That’s because, most people are still confused, […]

Valve Lifters: Hydraulic vs. Mechanical (Solid), Learn the Difference

01/04/2025

So, valve lifters, come in either hydraulic or mechanical (solid). But, what is the real difference, between them. Both, hydraulic and mechanical (solid) valve lifters, have the same job, but do it differently. They both […]

Valve Stem Seals: Basic Function, Seal Types, Failure Symptoms

06/04/2024

Valve stem seals, control the lubrication of the valve stem, as it moves up and down in the valve guide. By specific design, all valve stem seals are made to include, a precisely controlled leak. […]

Rocker Arms Dislodging – Along With Valve Seats Falling Out

01/23/2024

Rocker arms dislodging on certain engines, is a common problem and is usually misdiagnosed. So, a customer comes in and complains of a poor running engine. After diagnosing it, you find engine misfire codes. And, […]

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