Thanks for the replies. The pilot hole (to me) appears to be standard diameter. They did mention that it has a "tilton" style TOB for what it's worth and believe it to be aftermarket. I've been able to "categorize" bellhousings from a distance (swap meet) by visually measuring the distance from the edge of the pilot to the edge of the machined pivot hole.. a standard passenger car bell will have a distance of about 3/16"-1/4". A small pilot bell from '63 will have nearly a 1/2" distance. The truck bell (from my experience) has virtually no gap between the pilot and the pivot hole. Also, this has no reinforcement rib along the starter area like a 621 vs a 403.
Dave
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06-18-2025, 01:17 PM
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