The first run E-heads used five different head bolt lengths unlike the later versions so that set of bolts will tell you right there without measuring anything.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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