looking for info on mating turbo 400 to ls1 in 69 camaro going from bbc to ls1 turbo in my 69 pro steet does the 400 bolt up to the ls1 or do you have to mode the case?

 

Yes, it bolts up, but only 5 of 6 bolts. The bolt hole at the 2 o'clock position (facing the flexplate) doesnt' exist on the LSx motors (don't try and drill it, there's a water jacket there).

GM added a bolt at the 12 o'clock position which the TH400 doesn't have. If you're going for big power, you might try to figure out how to add a boss for that bolt.

Not sure of the specific details for the flexplate / spacer and TQ Converter. Somebody else should know. Or check out the transmissions forum......I'd say search, but it is sometimes hit or miss (sometimes it works, sometimes not).

'JustDreamin'

 

don't worry about the missing hole, 5 bolts is plenty strong ( i have a an F1-r on mine and the tranny is still attatched to the motor )

 

The flexplate part number to run a TH400/TH350/700r4/4L60 is 12551367 ($87.24). That flywheel is flat, not dished like the f-body, or c/k truck flex plate, so it requires a special spacer between the flexplate, and the crank. The spacer part number is 12563532 ($28.50), and the bolts for the set up are part number 12563533 ($3.88 each). The flexplate itself may come with the spacer, and bolts together... make sure to ask before you order so you don't end up with too much crap.

All prices are from gmpartsdirect.com

 

damn, thats a whole bunch cheaper than the TCI flywheel/flexplate. Is it by chance SFI certified? Probably not but if you're not spinning 7k RPM's all the time it's OK. I gotta check on that....