Thread: 400 & 454 flywheels

Tweet

Early stages of building a SBC 383 with 400 TB. Was wondering
if a 454 flywheel would be the same as a 400.

I wasn't aware that GM put a standard tranny behind a 400 so when I dropped a 400 into a 62 pickup I found a 454 flywheel and never had a problem.

Up until the one piece rear seals, the flywheel bolt pattern was the same on the small and big block cranks and differences were the size of ring gear for starter-and balance whether internal or external balance--------

I can get you the number of the flywheel I used, it's in my garage. I used the bellhousing that was behind the 283 that the 400 replaced and changed the snout on the starter since the starter bolts into the bellhousing.

How about a Canadian 402 big block? Thanks for your time, Eayne.

Originally Posted by wtrueman

How about a Canadian 402 big block? Thanks for your time, Eayne.

The 402 big block engine should be internally balanced so would not work properly with a crank designed for external balance such as a 400 SBC or 454 BBC.

Needs to be balanced

Another question on the 383. Thinking about complete
ext balanced rotating assembly with 9.8 compression
flat top pistons, 6 inch rods and 3.75 stroke at 64 CC.
The cam would be hyd roller. Would there be much machine
work on this set up?