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

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

   The traditional five-bolt pentagonal cylinder head pattern was replaced with a square four-bolt design (much like the 1964–1990 Oldsmobile V8), and the pistons are of the flat-topped variety (in the LS1, LS2, LS3, LS6, LS7, LQ9, and L33), while all other variants, including the new LS9 and LQ4 truck engine, received a dished version of the GM ...

3. Cylinder head porting - Wikipedia

   en.wikipedia.org/wiki/Cylinder_head_porting

   Cylinder head porting refers to the process of modifying the intake and exhaust ports of an internal combustion engine to improve their air flow. Cylinder heads, as manufactured, are usually suboptimal for racing applications due to being designed for maximum durability. Ports can be modified for maximum power, minimum fuel consumption, or a ...

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

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

   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. As such, the L31 head is compatible with all older small-blocks, and is a very popular upgrade.

5. GM High Feature engine - Wikipedia

   en.wikipedia.org/wiki/GM_High_Feature_engine

   Introduced in the MY2012 Holden Commodore SV6 and the MY2012 Chevrolet Camaro LS/LT, it is 20.5 pounds (9.3 kg) lighter than the LLT, thanks to a redesigned cylinder head, integrated exhaust manifold, and composite intake manifold. Other components like the fuel injectors, intake valves, and fuel pump have also been updated.

6. Reverse-flow cylinder head - Wikipedia

   en.wikipedia.org/wiki/Reverse-flow_cylinder_head

   This brings with it the problem that the exhaust ports have a tighter turn radius. This problem is somewhat offset by the larger port. Another popular solution, as used in the BMC A-Series and Holden 6-cylinder engines is the siamesed port. In this configuration one large port feeds 2 adjacent cylinders. The gain in area comes from effectively ...

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