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BBC 565 Bore and Stroke

9K views 8 replies 3 participants last post by  NOS-Nelson 
#1 ·
I'm about to purchase the rotating kit for a BBC 565.
It will be a 4.600" bore Dart Big M 9.8 deck, with Dart CNC 355 heads w/110 chambers.
I'd like to hear some educated opinions 4.25" stroke with 6.385" rod vs.
4.25" stroke with 6.535" rod, and the rq'd comp heights/ring packs
for these packages. Any pro's and con's to either set up?
This engine may see as much as a 400 h.p. shot in the future.
 
#2 ·
4.250 stroke and 6.385 rod will give you a 1.27 CH with the piston .020 in the hole. If you use an .043 upper Hellfire you can get the top ring down .350. The 6.535 rod works with a 3.950 stroke and the same piston.:cool:

This is for a 9.800 block I assume?
 
#4 ·
Wouldn't the 4.375 stroke be a 582? Sorry if I'm stating the obvious but you said you wanted a 565.

Craig
Oops! You're right. The point of the question is the different rod lengths and
comp heights. Original question edited!
 
#6 ·
My decision just got very easy.
I just bought a lightly used Callies Pro Magnum 4.25" , 6.535" Oliver I beams,
Je 4.6" piston set , and ATI balancer for less than an Eagle rotating kit ($1600).
This should be a slight step up from my current 431" BBC. LOL.:p
Time to hit the machine shop!
 
#8 ·
Honestly, I think that would be well down the road for me. This thing could go
high 9.20's n/a. That's considerably quicker than I've ever been. I'll be spending
the off season on safety and brake system upgrades.:)
When you say you wouldn't spray it , you mean within limits, or whatsoever?
 
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