long rod stroker vs short rod? cyclinders?

[masterblaster]

I have a setup thats using a rad 5 mill billet long rod crank with a spacer. Are their cylinders out there that can run this crank without a spacer. I have used it in the past with a enhancer at 25 static,she gets pretty hot in the upper revs with only 4 deg retard at 21. With the longer dwell time at tdc what is the max advance it could handle with a advent or TL if the final timing got as low as 14.
What does a long rod setup do with the power curve compared to a short rod assuming everything else is the same,with ign porting and such

 

[750SX]

longrods usually smooth out the power but keep your pistons alive.

 

[Waternut]

I always thought spacers and rods accomplished the exact same thing in two completely different ways depending on which way you go on each. I would think the only difference would be a spacer increases crank case volume.

I'm no engine builder but I would think if you used 2mm longer rods, it effectively lowers the ports but brings the pistons closer to the head. If you ran a 2mm spacer, it does the exact opposite. If you ran both at the same time, you'd essentially do nothing to the engine other than increase crank case volume.

 

[masterblaster]

in theory thats what I mean by port timing being the same.with the long rods you have to run the spacer,you cant clearance the domes enough without a spacer,so if the long rods were swaped for shorts and spacer was removed and port timing stayed the same,how much dif would the power curve be?