To fill this demand, Ed Winfield took the intake lobe from his full race cam and the exhaust lobe from his semi cam and called it a cam (see Flathead Performance Cams).
It was literally half way between a full race and 1/2 race cam.
Rudd promised 400 hp from the new powerplant, which would displace the same 5.7 liters as the standard Corvette engine.
The powerpack of new engine and transmission prompted this view of the pyrotechnics in our first drive (October 1988): "What we've got here is the Corvette from hell.
Since that time, 3/4 Race has become a generic term for a high performance street cam, i.e.
is a valvetrain configuration which places the camshaft of an internal combustion engine of the reciprocating type within the cylinder heads ('above' the pistons and combustion chambers) and drives the valves or lifters in a more direct manner compared with overhead valves (OHV) and pushrods.
We've also listed some of their cams on our Flathead Performance Cams page.
There were lots of cam grinders that copied Winfield and Harman-Collins cams, but these two were the designers and innovators in the early days. Later, there was a call for an intermediate grind between these two.
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Tony Rudd, Lotus's engineering director, came back with an alternative — do a completely new engine from scratch.