With the “Smogers” of the late 70’s and into the 80’s that were ‘dogs’ and an 85 MPH Speedo, can they be made to perform without radical mods that one can see? Ans., ‘Yes!" Ex., 1979 Hess and Eisenhardt Eldorado Convertible. Came OEM with an Olds 350 gas V8, ‘Y’ Block. Rated sea level H.P.? Try, 175. Ugh! One of the biggest reasons these vehicles are such low H.P is because of the low compression ratios. Usually around 8:1. So what did I do to wake this car up? (1) Installed a full roller Lunati Mild Roller Cam. Plus roller lifters and roller rockers. Necessitated tall valve covers that I modified to accept the PVC Port. Changed the nylon timing gears to a Double Roller Cloyes, True Roller timing chain. Installed 1984 Olds 307 heads with 68cc combustion chambers to boost compression. Original heads had 84cc combustion chambers. Also bigger valves w 2.0 intakes and 1.62 exhaust valves. Polished and ported the heads and port matched to the intake manifold. Installed forged domed pistons (stock bore). Resultant compression ratio? 10.5:1 Yes, you must use High Test Gas. Installed an MSD ML6 Ignition Box behind the firewall. Changed out the old pellet type catalytic converter for a new free flow (emissions legal) Walker Stainless Steel one. Ran a set of dual exhaust because I think they look cool. : ) Kept the smog pump and EGR. I.e., all the original smog equipment except the original Cat. Removed the weak TH325 trans and replaced it with a TH425 out of a 78’ Olds Toronado. Total results H.P. wise? Slightly over 300HP. : ) Best? None of it is ‘visual’ and the car still passes emissions both visual and tail pipe test. Now I just have to try to figure out what to do about the stupid 85MPH speedometer?