Stroking a 340 in a 68 Dart GT

[DevilDogSTL]

Read around 30-35 threads and whole bunch of thread titles couldnt find answer to my question so hopefully this isnt a repost.

Have a 68 340 block, and some will call it blasphemy to take out the stock forged crank. I want to throw in a 4 in stoker crank would it be possible to only change out the crank and keep rods+pistons in by using a higher cc head and bigger gasket, or swap crank and dish pistons, or would i have to do the whole rotating assembly, Only aiming for around 400-450 hp and torque. in a 68 Dart GT

Crank will be for sale once i make the swap for anyone interested, also have Race demon 850 carb with 340 victor intake if someone wants anything, make offers.

Respectfully,
Nate Thompson

 

[805moparkid]

well as far as i know 340's are 0 decked... so now you add the extra amount of stroke (??.250?? i dont know smallblocks)

so no you have to run the correct length rods and correct pistons to work...

 

[DevilDogSTL]

Thanks i should probably buy a book and school up, its just every 340 stroker kit is .030 over and i dont want to have the machine work done. will have to consult some local builders to keep me from making some novice mistakes.

 

[moper]

If the engine was rebuilt prior to the issues (looks like the car burnt?) then there is a chance that a: the engine is not destroyed (was engine bay engulfed in flames?). If that is still good, the entire rotating assembly is the way to get the longer stroke in it. Rods are the same length, but pistons are very different. I would keep reading.. You first need to know how the basics work before you start adding stuff. And make sure the engine didnt get engulfed in flames. If that was the case, I'd suggest you competely rebuild and re-machine it.