Originally Posted by polyspheric
Way back when, race rods saved weight where it was the least useful: the center of the beam.
The holes locate inboard of the radius to full thickness, and were used 1941-52.

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Years ago I read through an old (late 50's) "How To" encyclopedia on how to "hot rod you engine" It gave instructions on drilling the Valve retainers to reduce weight. I wish I had kept them just for the novelty.

'01 P1500, Blown/Inj BAE,/Veney ,Bruno/CS2,Dana 60
'01 Dodge 3500 S Cummins Auto, Fresh air kit, 4" Exhaust,
'05 Dodge Magnum R/T - Too Much to list
'60 Willys CJ5
'01 International LPX - Project,DT466, Allison
'64 Plymouth Valiant, Inj 528 Hemi, 2spd