| This upper t-stat housing fits all z's from 70-78. We also carry some of the lower t-stat housings as well. See listings. It also fits the PL510, 520/521 trucks, and 620 trucks with the L16 engine. If you have a bigger L series engine in your 510 or truck you can still use this housing. The only difference for those applications is that this model of housing uses 2 same length short bolts instead of one long and one short. If we happen to be out of stock please allow an extra week for delivery. Last update 05/10 | 
