zwede

My Dad is swapping in a Tremec 5 speed manual in place of a TH350. He got an 11" flywheel from a junkyard. He's wondering how he can make sure it is not externally balanced. Engine is a 350 (internally balanced, of course). He said it has 19 drilled holes. 2 large, 17 smaller and one hole on the backside. So is this internal or external balance?

PatsLs1vette

usually they have a weight attached to them.

joe73vette

There will be an approx 2 - 3 inch long cast-in weight behind the starter ring. Joe

MotorHead

Don't want to steal your thread but I wonder if a 350 flywheel can be converted to an externally balanced 400 flywheel or the other way around ?

joe73vette

MotorHead, you can buy a balance plate that goes between the flywheel and crank to use a standard flywheel or flexplate on a motor that needs an externally balanced one. They cost about $40 thru summit or jegs. For the price of a standard flywheel, I wouldn't butcher an externally balanced one to try to go the other way. Joe


[Modified by joe73vette, 1:40 PM 9/12/2003]

mountainmotor

Zwede,

An external balance flywheel will have large rectangular blocks on it, disregard the holes.

Late small blocks " std shift 5 spds" were internal balance front , external rear. If the flywheel came off a 3rd gen Camaro/Firebird with a 5 speed you can be assured it is external.

They can be purchased new for 90 bux,it removes any guess work and or need for resurfacing