you guys hate and hate and hate on pushrods, that's fine, BUT.
have you looked at the physical dimensions of a 4.6L cobra motor dohc , and a 5.7L LS1 ? the pushrods allow the cylinder heads to be MUCH, MUCH smaller. a phsyiscally smaller engine that can sit very low and very far back and be easier to work on.
just my .02. each one has its goods and bads. moving to general car chat.
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rest in peace tim.