New flywheel or no?
 

After reading through this thread, am I understanding that I can just re-use my old GenV 454 flywheel for my new build 454 bored over to 496 and stroked?

flywheel

I did buy an upgraded harmonic balancer. no way I’d use the old one on a motor making double the power.

You should have had the flywheel and new balancer with it when the engine was balanced. Internal or external balance with the new rotating assembly?

it’s already internally balanced. Forged internals. Didn’t come with a flywheel or harmonic dampener

Therefore, you’re flywheel and dampener need to be for neutral balance.

Did you have these ‘kit’ parts checked for measurements and balance ?

you need a new flywheel that doesn't have the extra weight added to it.its in the form of a large casting bump out from the outer edge.

good to know and yes I did. 👍🏼

You can have your flywheel neutral balanced. Any machine shop that does crankshaft balancing should be able to do it for you.

Which damper did you buy ? It needs to be internal balance also.

I have chucked them in a brake lathe and removed the weight and then just had the final balance done with the rotating assy.

this one

however, I’m considering on sending it back and going with ATI

both are internally balanced and SFI spec 18-1

I would go with the ATI for sure. One thing with the ATI damper. They almost always need the hub to be honed to get the proper interference fit. They are almost always too tight. If you order it directly from ATI and you have a way to precisely measure your crankshaft snout, they will hone it to the correct fit. Otherwise most good machine shops should be able to do it for you although a lot of guys do not have the correct mandrel for the rod hone to do the job.

good to know. You’re not the first person that has said that about the ATI dampener.

what’s everyones thoughts about a billet aluminum flywheel? Or stick with steel?

Steel

been trying to read and figure it out. Found a thread from a long time ago. Lighter flywheels have issues while idling in gear…….I realize that makes no sense, but just putting your boat in gear and having no throttle lighter flywheels let the boat stall and quit. Steel it is.

Yup.
Good searching. :thumbs

Hays 10-130. Gota see if it will work on my build even though it says it won’t fit 454. Mark V orVI block

hays flywheel

I have a lightweight billet on mine....it revs up noticeably quicker is about the only difference I see. I am fuel injected so haven't experienced any of the idling issues you're talking about? Just my experience.

I wonder how the steel VS. aluminum flywheel reacts to choppy conditions?

I know aluminum will rev faster, but steel should keep inertia going when the drive leaves the water and re-enters. I would think the lighter flywheel would have more of a load shock VS. the steel.

That's at least my understanding of how it worked on the jet ski.

Since I am in the mist of an engine rebuild I want to install a new balancer on my Gen 6 502, what brand do you have an ATI? Also who makes the lightened flywheel?

ATI balancer and I don't have a clue for the flywheel. Came in the pile of parts I got the motor in so I had it checked and decided to use it since my iron flywheel has a tooth missing anyway. Sorry wish I could be more help

Theres a lot out there. cpperformance, jegs, summit.... they'll have flywheels and balancers for you.

Is it the same as an automotive one and the engine coupler will bolt up? I have to look I don't remember but is it a flywheel or a flexplate? I assume its a flexplate like found on a auto transmission vehicle?

Marine uses a Flywheel. Use same diameter you already have.
Unless you have a top mount starter, you use one for an automobile.

flex plates are for auto trans.

This is correct. no flex plate, flywheel. Some newer boats have a tranny, nothing like a car though.