how many liters it the TSP 454ci LSX shortblock?
what heads are being used on them?

 

A old school big block 454 is a 7.4 liter

 

It is a shortblock. You can use any ls style on them. To really get the bestof the cubes though, I would use a ls7 style head if you want to stay with a composite intake. If you have the $$$ for a sheetmetal, Wilson billet, or Harrop, You could also look at one of the bigger ET heads or a set of custom ($$$$) ported ls6 heads. Good luck and be ready to put a low temp stat on your checkbook/credit card