Stroke a 383 Mgnum or 400 engine?

[Challenger340]

I've deleted my prior post, it was dis-respectful to "iS It EvEr Done".
I apologize.

Let's just leave it at this.

You're absolutely correct, "iS It eVeR DoNe", Lots I don't know.

This is a MOPAR Board, Mopar specific, at least I think it is.

"How far does the Piston travel, in the Bore of a BB Mopar, from T.D.C. to 90 degrees crank rotation, compared to the second 90 degrees to B.D.C."

If your answer is " It travels the same distance in the top half, as the bottom half ", on a "mopar" engine,

then use any rod length you desire on your Mopar.

You do it your way, I'll do it mine.

Nuff said.

Think "offset main". Ever wonder why #6 cyl. on a BB Mopar, is always "late", after you degree # 1 Cylinder ?

[Ghoste]

Wow, this has become a fascinating thread. 

[firefighter3931]

Bob, thanks for the post and real world experiences you've shared.  My engine building adventures have centered around milder street/strip builds in the 500-550hp range using factory blocks, heads, rods, cranks etc......but a lot of the same principles you illustrated in these larger displacement/power combinations still apply, inmo :

I've done 540 Mopars with 572-13 heads(2.25" valve), using Maxx blocks and made 900 H.P., then did a 540 Mopar mega-block using 440-1 heads(2.19 valve), with ALOT LESS FLOW, but added 7.150" rods, and saw 894 H.P. with a Flat-tappet camshaft.

I lke this comparison between a small head and a large head. Basicly the increased rod ratio helped to carry the tq peak higher and allowed the engine to make excellent power with a head that would be considered "smallish" for the displacement. The same applies with a BB oem head which is really too small for a 440ci displacement....it's the reality that we as Mopar guys have to live with. A BB stock head is only 10% bigger than a SB stock head yet it is expected to feed an extra 100 cubic inches (340 vs 440). That's a hell of a disadvantage.....but the long rod and 1.80 rod ratio helps to make it all work. That has been my experience. 



Ron

[Challenger_7]

 

[Ghoste]

Challenger340, any way you could repost your experience in a respectful manner?  I read the original and I like to see different ideas thrown out like that.