Something seems to be in a bind or too tight.I would take the advice of wrenchbender and doc.What about the position of the pistons on the rods?Check the valve adjustment.

Wrenchbender, do they have the rubber one for the 1954 261 i bought from john ? Is the rubber one better or just easier to install ?

1951 3100 Chevrolet
1951 Chevrolet Suburban Carryall
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