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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.
An evolution of the 1964 DOHC prototype “XJ13” engine, the Jaguar V12 engine is a family of SOHC internal combustion V12 engines with a common block design, that were mass-produced by Jaguar Cars for a quarter of a century, from 1971 to 1997, mostly as 5.3‑litres, but later also as 6‑litres, and 7‑litre versions that were deployed in racing.
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 ...
A cylinder head of a four valve Nissan VQ engine engine. A multi-valve or multivalve engine is one where each cylinder has more than two valves (an intake, and an exhaust).A multi-valve engine has better breathing, and with more smaller valves (having less mass in motion) may be able to operate at higher revolutions per minute (RPM) than a two-valve engine, delivering more power.
Ford offered a performance head that was a stock part on 1993–1995 Mustang Cobra models and pre-1997 ½ Ford Explorers and Mercury Mountaineers equipped with the 5.0 L engine called the GT-40 head (casting ID F3ZE-AA). In mid-1997, the Explorer and Mountaineer 5.0 L heads were revised and renamed GT40P.
The 5.8 is formally known as the Trinity Engine or 5.8-liter V8 engine, which benefits from cylinder heads with improved coolant flow, Ford GT camshafts, piston-cooling oil jets similar to those found on the 5.0 Coyote, new 5-layer MLS head gaskets, an over-rev function that increases the red line to 7000 rpm for up to 8 seconds (from 6250 rpm ...
For 1956, Dodge increased the displacement to 315 cu in (5.2 L) with a longer 3.80 in (96.5 mm) stroke and a taller raised-deck block, but used polyspheric rather than hemi heads on the base version. The optional high-performance D-500 version had a four-barrel carburetor and a larger-valved Dodge hemispherical combustion chambered head.
Unlike most other car makers at the time, Buick had been using a valve-in-head/OHV overhead valve reverse-flow cylinder head design or I-head since their inception and continued this practice in their straight-eight designs.