ErikSTANG

recently i purchased a 347 stroker, and when i droped it in, we used my old flywheel off my orginal 302. When i break 3500 Rpms the car shakes, and violently. It's to the point where i can't hold onto my shifter due to this, it literally makes me sick it shakes so bad. I have narrowed it down to be outside the engine(engine is running fine) could it be my flywheel? Do i need an upgrade to my flywheel for the new stroker? Could it be unbalanced and cause this kind of shake? if not can anyone lead me in the direction of what it could be?

ErikSTANG

anyone? i sorta need help, or if i list all specs on the engine and the balance can anyone tell me what flywheel to buy? im at a loss and can't figure this out. any help would be great

mrbigshot

what balancer was used on your 347 kit? the metric 302's (5.0's) use a 50 oz balance and earlier models did not.

ErikSTANG

I'm not sure, i have a list of things thta were balanced, what would i look for to know what it was balanced at? and its a 1995 302(the orginal before it was bored and stroked to 347)

88stangaruu

the older cars before like 1982 or something along there use a 28oz imbalance...It can be a dented or out of balance driveshaft to.

ErikSTANG

driveshaft is brand new, bought my engine, ignition, distributor, drive shaft, rear end+gears, and my tranny within 2 days of eachother, so all of that is new

Boss_Hotrod

If you balanced the rotating assembly them your going to have to figure out what it was balance to and get a balance and flywheel set to that balance.

ErikSTANG

I wish i could find my spec sheet from the engine build rightnow, its here somewhere i just misplaced it. i know what the piston, poston pin, piston rings, pin locks, total rod, insert, rotary, reciprocating, and bob weight were balanced to but don't know what i need exactly, I'm still learning about the engine stuff

88stangaruu

you need to know what the complete rotating assembly (ie, pistons, crank, rods.) was balanced to. a 28oz...or a 50oz.

stanger88

Is it at 3500rpm in EVERY gear? or just first? If it is in EVERY gear, its your engine (blancer,flywheel,whatnot) if it is 3500 at only a certain speed, irs driveline.