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2. Crossflow cylinder head - Wikipedia

   en.wikipedia.org/wiki/Crossflow_cylinder_head

   A crossflow head gives better performance than a Reverse-flow cylinder head (though not as good as a uniflow), but the popular explanation put forward for this — that the gases do not have to change direction and hence are moved into and out of the cylinder more efficiently — is a simplification since there is no continuous flow because of valve opening and closing.

3. General Motors LS-based small-block engine - Wikipedia

   en.wikipedia.org/wiki/General_Motors_LS-based...

   It also features higher flowing cylinder heads sourced from the L92, a more aggressive camshaft with 0.551 in (14 mm) lift, a 10.7:1 compression ratio, a revised valvetrain with 0.236 in (6 mm) offset intake rocker arms, a high-flow intake manifold, and 47 lb (21 kg)/hour fuel injectors from the LS7 engine.

4. Scavenging (engine) - Wikipedia

   en.wikipedia.org/wiki/Scavenging_(engine)

   Crossflow cylinder heads are used by most modern 4-stroke engines, whereby the intake ports are located on one side of the combustion chamber and the exhaust ports are on the other side. The momentum of the gases assists in scavenging during the 'overlap' phase (when the intake and exhaust valves are simultaneously open).

5. Reverse-flow cylinder head - Wikipedia

   en.wikipedia.org/wiki/Reverse-flow_cylinder_head

   The main advantage of the reverse-flow cylinder head is that both the entering inlet charge and the exiting exhaust gas cause a tendency to swirl in the same direction in the combustion chamber. [1] In a crossflow head the inlet and exhaust gases promote swirl in opposite directions so that during overlap the swirl changes directions.

6. Chevrolet small-block engine (first- and second-generation)

   en.wikipedia.org/wiki/Chevrolet_small-block...

   The Vortec 5700 L31 (VIN code "R") is a 5.7L V8 truck engine. It is Chevrolet's last production first-generation small-block. The cylinder heads feature combustion chambers and intake ports very similar to those of the LT1 V8, but lacking the LT1's reverse-flow cooling and higher compression.

7. Hemispherical combustion chamber - Wikipedia

   en.wikipedia.org/wiki/Hemispherical_combustion...

   A hemispherical head ("hemi-head") gives an efficient combustion chamber with minimal heat loss to the head, and allows for two large valves.However, a hemi-head usually allows no more than two valves per cylinder due to the difficulty in arranging the valve gear for four valves at diverging angles, and these large valves are necessarily heavier than those in a multi-valve engine of similar ...