Rod length & stroke question

[ValiantKevin]

So my 360 has been machined to a deck height of 9.580, I already have new in box Speed-Pro Hypereutectic Pistons H116CP30
Details (Sealed Power H116CP30 Speed-Pro Hypereutectic Pistons | Summit Racing)

Part of me thinks I should be fine reusing the stock rods, I would for sure be fitting them with ARP bolts if I did.

Question for the engine builder math wizzes... Given what I already got, what options do I have?
If I use the stock crank, am I stuck with the 6.123 length?
(Yes I am aware of the CR ratio factors depending on the heads chamber cc I just am unsure if I can even consider using the longer rod in the factoring of my CR)

Second question, if I went away from the stock crank (doubt I will) but thought I'd see what factors I might not be considering that I should... such as are there other stroke/rod combos I should strongly consider?
Such as if I was to go with a new crank, there any "secret awesomness" I should be aware of? Such as going with a shorter stroke with longer rods kind of combo?
Or should I just stay with the stock crank & rod lengths given what I got?

 

[Bewy]

Are you kidding? The difference in rod length is 0.002".

 

[junkyardhero]

stay with the stock crank and rods. if you're going to build a stroker, you do that from the jump and choose complementary pieces. changing midstream is only a lesson in frustration and wallet lightening.

check with your machinist on the reconditioning the rods. it may be a better move financially to just buy new units. also, at your power level stock rods and rod bolts will work just fine.

ETA: i'd meant to say stock rod bolts will work fine.

 

[Ottmundr]

That extra two THOUSANDTHS is really gonna help your rod:stroke ratio. You should totally go for it.
6.123/3.580 = 1.7103351955307262569832402234637
vs
6.125/3.580 = 1.7108938547486033519553072625698
Wouldja lookit the difference?!?!!
OVER ONE HALF OF ONE TEN THOUSANDTH DIFFERENCE IN THE RATIO!
Holy smokes!

You'll get more of a performance gain if you take a **** before you step out the door.

 

[PROSTOCKTOM]

If I use the stock crank, am I stuck with the 6.123 length or could I go with 6.125?

There are no 6.125" rods made in Mopar 2.125" crank pins and .984" wrist pins unless you want to spend several thousand dollars to get a custom set made.

A 6.125" rod will be Chevy dimensions 2.100" crank pins and .927" wrist pins.

.002" of an inch will make absolutely no difference in your build.


As far as building a stroker you'll need at least $3000 to $4000 just for the balanced rotating assembly, and once you build large cubic inches (408") you'll need $$$ heads.

Tom

 

[ValiantKevin]

Are you kidding? The difference in rod length is 0.002".

There, I edited my OP... please forgive me lol... it was the 4th of July after a long day of celebrating, whoops.

 

[273]

There, I edited my OP... please forgive me lol... it was the 4th of July after a long day of celebrating, whoops.

All stock Mopar V8's already have great rod ratio's, if stroking which you said your probably not, does lower the ratio, would be worth while ($$$/hp) to correct ? probably not especially on a sub 8000 rpm engine.

 

[RustyRatRod]

There is no such thing as a "good" or "bad" rod to stroke ratio. Each has a different effect and that's ALL. If you get sucked into the argument looking for the "perfect" rod to stroke ratio, you're being fooled by the magazines and forum gurus. Use what you have and go.