HTRIS - Heat Riser All Studebaker engines - NAPA 600-1824 Cadillac....$64.50 
Aug 2000   egroups chat --- V-8 heat riser valve substitution Everco #1095 
listed for 67 Cadillac. This is machined steel rather than cast and only 
external change is that the counterweight faces the front of the engine rather 
than the rear Another entry lists the Cadillac part # as 3632576 

HTRIS - Heat riser NAPA #660-1824

HTRIS - 63 - 64 Avanti R1 / R2        Heat Riser Unit          536171     
GM   3632576    Requires  longer Studs

HTRIS - V-8 heat riser valve  - Everco #1095 ( listed for 67 Cadillac.) 
Counterweight faces front

HTRIS - V-8 heat riser valve - Cadillac part # as 3632576  (Tw Jan 1978)