The earlier 351C 4V blocks typically did not have 4 bolt mains. Many could be retrofitted by drilling and tapping the bosses that were cast in place but not drilled and taped, but I think the early 2V engines did not even have the cast bosses but the later 2V engines had the cast Bosses but not the 4 bolt Caps. So I know there were running block casting changes. The Cleveland facility was state of the art at the time, and that is why the Australian Blocks were cast heavier because the Aussie¹s could not hold the precision in casting that the Cleveland folks did. Cleveland folks cast them pretty thin walled and light, which is why core shift is such an issue. I don¹t know if anyone is on the list that could comment as to what and when those casting changes went into effect? Larry On 6/21/16, 9:20 AM, "DeTomaso on behalf of Daniel C Jones" <detomaso-bounces@server.detomasolist.com on behalf of daniel.c.jones2@gmail.com> wrote:
That's just weird.A ?!? I wonder what the real difference is there. A A A Any ideas?A Maybe something Dan Jones could speak to? I don't know of any design differences between early and late (D2AE) blocks that would account for hot starting.A FWIW, two of my D2AE 4 bolt main blocks had hard starting when warm.A One was due to tight fitting swap headers (351C in 1966 Mustang 2+2 fastback) cooking the full size starter.A The other was in my second 1974 Pantera but that was due to the 30+ year old starter windings.A Both went away with mini starters. Things that would make starting harder would be poor grounds, tighter clearances/heavier oil viscosity and higher cranking compression.A Later short blocks were low compression so would be easier to crank over. Dan Jones
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