Has anyone ever went from a 350 chevy to a 383 and lost h.p. or lost time at the drag strip???  Yes I know the longer stroke will add power. But it also does this at a bit lower of a rpm. In theroy if you change nothing but the stroke of the crank (3.48 vs. 3.75), a 350 will run more rpm's. I was just plugging some imfo on my desk top dyno on my motor set up. In 350 form the top end power was 21 higher and at 600 more rpm's than a 383. But the 383 had more bottom end and midrange and peak power was at a lower rpm. When you compare the average from 2500-6200 rpm the difference was so small it would never be noticed. I know computer programs are not to be used as nothing more than for bench racing. I have my 350 tore down right now waiting its seasonal go-thru and am considering going to 383 with the 5.7 rods. But before I go sticken another 600 in a crank and 400 in a set of pistons I would like to hear from some one who has went from 350 to 383 with no other major changes like bigger cams and such. Was it worth the $ and how much did you gain if anything.  

From what i've built with the same setup the 350 no matter what it was bored to out did the stroker in high RPM H.P. the stroker will have less H.P. but more torq.I have one simular to the desk top dyno but more accurate that was produced by IHRA and is no longer produced any more.Yes I have seen a lot of 350 chevys smoke 383 strokers.  

without changing anything else you are correct RAT,to take advantage of the extra c.i.you must adjust everything to match.bigger cam,better heads/intake combo,carb.so to that end unless you want to spend acordingly just freshen up your 350 and go.  

Thanks for the excellent input. I have a high dollar forged crank in my 350 now that is still perfect after 6000 street miles and many 1320 passes. This year I'm running a bit bigger cam and a different carb. I have decided to run a different piston to bump compression a bit. This is why I have been thinking of going stroker. All I would need additional is the crank. But it is nice to be different--every one strokes 350's to 383. When I say its just a 350 they always look at me funny and say "its not a 383". Last year I ran 424 hp. This year I will have about 20-25 more hp with a 150 shot of jiggle juice. I think I'll save my 600 bucks on a 383 crank and be happy with what I have.  

Does Anyone Know how to Uninstall a Kill Switch?  

Its very possible to lose a bit of horsepower when simply  increasing the stroke and not changing anything else, but that being said if your components support a 350 well it's highly unlikely that adding the extra stroke will mean a 30-35 horsepower loss. We're not talking about a 454 versus a 540 with stock heads here. If we're talking about adding 30 cubic inches with aftermarket cylinder heads I don't see much of a problem. The worst-case scenario is a near break-even point on horsepower production with more power being made down lower. It's up to you to decide the risks since its hard to judge without knowing everything about the ride...  

The longer stroke of the 383 makes for better torque at low and mid-range RPM.   That's why its called a "stump puller" or "truck" engine.  Same with the SBC 400.   Longer crank throw and piston travel means loss of energy at high RPM.  Basically, the engine can't get out of its own way at high RPM.  

The hp output of an engine is not dictated by its cubic inches it is dictated by its cylinder head flow,more cubic inches allow you to use a larger port volume cylinder head to make more hp.at a reasonable rpm.
 As an example if you were to take a set of cylinder heads off of a 707 bbc and bolt them on a 396 you would probably have to spin the 396 to 15,000 rpm to make the hp with them,now this example would have other problems also but this is the relevance of cubic inches in engine building.
 This is why a larger engine makes about the same hp as a smaller engine when the cylinder heads are the same but at a lower rpm,the larger cylinder/longer stroke maxes out the cylinder head flow sooner in the rpm range.
  It is key to remember that in a naturally aspirated combination the cylinder head is the only way to increase hp once the combination has been refined,and the cylinder head will produce between 2-2.2 hp per cfm of airflow so if the cylinder heads you are using flow 220 cfm on a flow bench then about 440 hp is all they will make no matter what size engine they are bolted to, only the rpm at peak power will change.