1/29/2024 0 Comments Best sounding cam for 350![]() Part number 10125377 is the 1987 and up version with 72 degree center holes. Part number 10159552 is the 55-86 version with 90 degree center holes, it is made from castings 14096217 or 14011083. They are usually pretty cheap because nobody's looking for them. Check out castings 1409621083 these are sold as cast iron L98 heads which is pretty much the same thing as the 193 with no swirl port vane to cut out. If by porting you mean getting rid of the swirl vane you're on to something, they will wake up when ported but it's a lot of work. Figure that in your gearing and tire size. They gain very nicely to about 4300 then level off to about 5 then just quit. What these heads really do is limit the upper RPM band. Most any late model double quench, centered spark-plug, fairly modest port and valve size head will do that. ![]() The 193s are intended to get good gas milage at low RPMs in a heavy truck they aren't necessiarily meant nor do they create large low end torque numbers. ![]()
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