The WA block came in '70 455 360 hp GTOs with #64 heads, it is a manual trans block code. The YA is the same engine for the auto trans cars.
The YA code was also used on the 'regular' 250 hp '73 455 automatic engines.
Let's go racing!
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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