I'm going to look at a BBC 427 block and rotating ***embly. The numbers seem right for a '67 high performance 427, and it has the 4 bolt mains. Seller says it is a Marine engine. Any important differences with a marine engine?
I bought A Jet boat many years ago the for the fun of it, enjoyed it for a few years, pulled the motor and installed a 454. First motor turned out to be a numbers matching 435 HP. 427, sold the long block to a Corvette freak for 8k. not to long ago. Most Marine BBC will NOT have numbers stamped on the front pad, they are bare. Lots of Marine bare pad motors in high end Vette's with owner stamped #ber's!
Was the 435/427 the original motor? The "number" I was working from is suposed to be a casting number. Haven't seen it yet. What I am wondeing about is that I understand some marine motors have additional bosses tapped for remote oil filters and such. I havae also heard something about a "fifth bolt" for the mains, that seems a little odd. I want a motor for a '67 Vette.
I believe all HyPer 427 BBC are drilled for the remote oil filters................ The casting number would be just as good or better than a stamp pad number as far as when it was made, same with heads.......
Watch for excessive rust in old marine motors that were run in salt water. Alot of the smaller boats had fresh water cooling. [no heat exchanger] They can get really crusty inside.
The mystery deepens. Looking through the net, I find that "most" marine engines are based off a truck block. With a 427 that means a "raised deck" of .400. OK, fine. I have looked through a list of BBC casting numbers and can't find a number for a tall deck 427 before 1968. So, was there a '67 427 available in trucks, or was the truck engine "new" for '68?
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