When I had 1967 GTO HO reproduction RARE manifolds (POR-15 painted) on the 455 I used to daily drive in my ‘64 Tempest I used a reproduction starter solenoid heat shield. Also installed a Ford starter solenoid relay and huge 2/0 welding cables for sure starting.
Never had any heat related starting issues ever, I was using a stock starter.
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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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