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The "Street Hemi" was similar to the race Hemi but with dual inline four-barrel Carter AFB carburetors [clarification needed] (with automatic choke), lower compression (10.25:1 from 12.5:1) and lower-lift camshaft, with iron exhaust manifolds instead of lighter steel long tube headers. [citation needed]
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 ...
The Hemi-6 valves are angled apart (splayed) 18 degrees (included angle) along the crankshaft axis, and the intake valves are as large as 1.96 in (50 mm). The 6 intake and 6 exhaust valves open slightly towards each other and away from the cylinder wall, which results in less "shrouding" of the valves and greater airflow potential.
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