390-cubic-inch V-8 and optional 345-horsepower 428-cubic-inch engine. with only 25 miles, 4 door hardtop with suicide doors, new fuel tank. Under fire from the competition, the 1967-1971 Ford Thunderbird worked hard to. The comment that the insulators are set up to move the engine position in order to accommodate the transmission sounds logical to me: now the question is what is the difference in dimensions, and which mount moves the engine forward (I assume the C6-style one)? Posted: May 18th 2023 Northwood, ND Watching: 48 Views: 1269 Thunderbird Landau 67' New motor 390 cu.in. 4-Barrel Autolite 4300 Carburetor/Dual Exhaust System. As time went on Ford dropped the convertible-unique mounts and merged the part numbers together, indicating that there must have been a very minor difference in positioning. 17 installation rate) Thunderbird 390 Special V-8 Engine (315 Horsepower) 4.05' Bore x 3.78' Stroke/10.5 to 1 Compression Ratio. What the differences are between mounts for the hardtop/Landau vs Convertible I don't know, but suspect this may be related to either lateral position of the engine or height in order to clear the additional engine bay braces for the convertible body. The metal support brackets between the insulators and the cross-member are apparently unique for each model year. So, from these listings, it's apparent that '64-'65 insulators (the parts that bolt to the block) can be used with '66 390 w/Cruise-O-Matic, while the '66 390 AND 428 w/ C6 will need the '66-numbered insulators.
Support Brackets - RH C6SZ 6028-A, LH C6SZ 6029-A
Support Brackets - RH C5SZ 6028-A, LH C5SZ 6029-A Support Brackets - RH C4SZ 6028-A, LH C4SZ 6029-A From the Master Parts Catalog circa August 1968: Note the '63' is Hardtop and '76' is Convertible
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