those were grade 8 bolts i got at the hardware store
or so the bin said...lol...the spacer block i milled a key into it and the steering arm.....both are steel....i have since upgraded to 5/8 studs(bolts were 9/16)..and its been fine...now im goin to a 60 front....
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short wide box,350/700r4/3.73posi
71 olds cutlass "S" mom bought new..12.30s@113MPH