So factory motors are externally balanced to a degree then. Do the various different motor sizes having slightly different rotating member weights have differently weighted flywheels? Only thing I ever heard about this was that the 400 had a different flywheel for some reason ... heard that from someone I thought might have been confusing 400 Chevy with Pontiac. Now Im the confused one
PS Going downstairs now to look at a 400 flywheel and the SFI flexplate I bought for the Kool-Aid Keith 444 to look for extra drill holes ...
Factory flywheel has numbers 52561-3 (I think they are barely visible)
- it has one fairly deep drill hole on the backside that looks like might be
- 6 holes for mount holes and 2 smaller I think to align only in 1 position?
Nope I dont know what smaller 2 are for the 6 only line up in one
Aftermarket SFI flywheel marked FWFP455
- doesnt appear to have any balance mods
- does have 2 small holes like flywheel in same relative position but
further out (closer to ring gear)
- kind of misleading PN .. it doesnt fit a large journal crank bolt pattern
I freaked when I put both on the end of a large journal crank I had handy and neither 6 mount holes lined up in any position .. then light bulb went off and I tried on small journal crank and they both lined up 1 position only. Guess I learned small journal and large journal have different bolt patterns and dont interchange .. probably different enough balance to make unacceptable running balance condition so they did that. Possibly the dash number on PN identifies motor size flywheel is for as well within small journal applications? Havent found reference yet. My 444 will use a Scat forged small journal crank with 4" stroke so either my flywheel or flexplate should bolt up, one will not have same balance as other most likely. Paul at Carter cryo will balance my ra with flexplate. My factory gold 71 Formula 444 with factory quarter-stick fresh black interior is getting closer