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I'm interested in a BBC/Turbo street engine project and have been looking at some of the big chevys for sale and offered by builders.

I've noticed some of the 565s are in 9.8 deck blocks are maybe 4.25 stroke. Is this the most common 565? Is this the best 565?

One of the engines I'm interested in buying, the guys says it's a 10.2 deck dart block and 4.375 stroke. Which combinations are most popular and better in the mid 500" range? The 565 in question may need a new crank, is it possible to get an eagle or other low cost 4340 crank for this engine (4.375)?

The 10.2 engine comes with Dart 340 (I think) pro-1 heads, conventional style, and is already set up for boost.

Thanks for any input.
 

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4.250 is the most common, it's easier to get a intake, also shorter pushrods help. I have a new callies compstar 4.375 crank for sale if you go that way.
 

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540/555/565 is very common with a 9.8 deck but are falling off in favor of larger displacements. Using a 4.375" stroke, you can easily push a 4.600" bore out to 582 CID in a 9.8 block which is a very nice combination. Although a 9.8 aftermarket block can be pushed out to 598 using a 4.500" stroke, it's more common to get into a 10.2 block by the time you reach that displacement.

There are more and more cranks available for the 4.375" stroke but piston choices are not as common yet. JE and Wiseco make them plus a few others. It all depends on how big of a dome you want as to what choices you get.
 
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