Oil Pan / block fitment

Is there something different about a C9/Dove block that some oil pans don't fit?

The reason I ask is the feedback/comment on this oilpan stating it won't fit on a 69 block.

http://www.summitracing.com/parts/ctr-18-760

Might be referring to a Boss 9 block with 4 bolt front and rear caps

Some AFTERMARKET oil pans just don't fit and need some persuasion. That problem is usually not there with anything O.E.M.
I have no idea what they mean so, Dave may be absolutely correct.

jasonf wrote:Is there something different about a C9/Dove block that some oil pans don't fit?

The reason I ask is the feedback/comment on this oil pan stating it won't fit on a 69 block.

http://www.summitracing.com/parts/ctr-18-760

The feedback comment of "This is Oil pan not fit for 460 year 69!!" is from an end user, not the manufacturer.  The end user is either inexperienced or he received a defective pan.  As designed, that Canton oil pan should fit all year passenger car blocks without issue.
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dfree383 wrote:Might be referring to a Boss 9 block with 4 bolt front and rear caps

The C9AE Boss 429 blocks had 4-bolt main caps on #1 through #4, but not #5. The Boss 429 block had a 2-bolt #5 main cap.  The #1 4-bolt main cap does not interfere since the pan rail continues forward to the timing cover before turning in toward the front radial pan seal.

Thank you