3/8" is the way to go
Most of the current racers no longer use the 7/16" pushrods as a good 3/8" chrome moly pushrod has adequate stiffness at a significantly lighter weight. I have used both the 7/16" and 3/8" aftermarket and stock pushrods in my engines and to 7000 RPM with a flat tappet cam and a valve spring with about 135# seat pressure and about 330# open pressure it doesn't seem to make a difference at all.
Be aware, many manufacturers do NOT individually inspect their pushrods. I personally inspect EACH ONE and have found that with the pressed in ends often enough one or two pushrods in a set will have small cracks starting where the end was pressed in place. Although some will complain about the type with the welded on ball ends, at least I have never seen a new one with cracks.
Mark
Most of the current racers no longer use the 7/16" pushrods as a good 3/8" chrome moly pushrod has adequate stiffness at a significantly lighter weight. I have used both the 7/16" and 3/8" aftermarket and stock pushrods in my engines and to 7000 RPM with a flat tappet cam and a valve spring with about 135# seat pressure and about 330# open pressure it doesn't seem to make a difference at all.
Be aware, many manufacturers do NOT individually inspect their pushrods. I personally inspect EACH ONE and have found that with the pressed in ends often enough one or two pushrods in a set will have small cracks starting where the end was pressed in place. Although some will complain about the type with the welded on ball ends, at least I have never seen a new one with cracks.
Mark
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