Engine Dyno Question

[SoulSurvivor]

My co-worker just finished his rebuild on his 340. He primed the engine with Royal Purple break in oil and took it over to a dyno shop to perform an engine dyno before putting it into his car. It cost him $450 and six hours. He said "they didn't have a small block Chrysler flywheel so they used a big block 440 flywheel and attached it too the 340'. The dyno went well(nothing blew up). I don't remember what the numbers were but I have to ask this question. How much of a difference would the numbers be? I told him to he shouldn't have gone through this dyno effort when all the shop had was a BBC flywheel.

 

[jbc426]

How much of a difference would the numbers be than what?

 

[RustyRatRod]

It is entirely possible that everything was fine. As long as the 440 flywheel was balanced the same as the 340 engine, all was well.

 

[ScampMike]

this makes me think they may have been poking him.. http://www.jegs.com/i/RAM+Clutches/798/1503/10002/-1

 

[skep419]

it would be fine if it was internally balanced. but they take different weights if its externally balanced. not sure if it would hurt anything.

 

[TrailBeast]

There isn't so much difference in the flywheels that it would change the numbers any, unless it was not the correct balance as already stated.
I doubt anyone would/could run a dyno test if the balance was wrong.

 

[SoulSurvivor]

Thanks guys. I'll pass this along to him.

 

[crackedback]

Agreed with those saying it's not a big deal. As long as balance is correct, it's all good.

 

[67Dart273]

I sure as hell would not want the mains partially pounded out after using a "six pack" flywheel on a neutral engine!!!

 

[mderoy340]

I sure as hell would not want the mains partially pounded out after using a "six pack" flywheel on a neutral engine!!!

I agree. I would think it would be kind of hard to feel engine vibration when you are sitting at a dyno control desk.

 

[j par]

I got my small block flywheel from 440 source lol