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Click on image for the lowdown. 
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| | | Forums66 Topics128,048 Posts1,055,538 Members48,424 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Dec 2008 Posts: 899 'Bolter | | 'Bolter Joined: Dec 2008 Posts: 899 | CTD could either a 1974 400 or a 1978 305. Scroll down the chart till you see CTD. http://www.1968ss.com/sbcsuffix.aspAlso run your hand down the side of the block. 305 will be flat. A 400 will have slightly protruding lumps because of the larger bores. 400 will have a notch cut out of the harmonic balancer, because it's externally balanced.
Brian
1955.2 3100 Truck
The older I get the more dangerous I am!!!!! | | |
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