From Wikpedia :
"Based on the standard Pontiac 301, the 301 Turbo was unique in that it had a beefier block than the 77-81 naturally aspirated, lower compression pistons, a relatively mild camshaft, a high pressure oil pump (60 psi) to ensure adequate oil to the oil-cooled Garrett TBO-305 Turbocharger, a rolled fillet crankshaft with 2 instead of 5 counterbalances, a fully baffled oil pan, and a high pressure fuel pump (10 psi), a unique single plane intake, side and turbo-specific exhaust manifolds, and an Electronic Spark Controller(ESC) using a knock sensor to retard timing when detonation is detected. The Turbo 301 used the same bearings, rings, lifters, and most external accessories used on the N/A 301s.
The M4ME (E4ME for 1981) 800 cfm Rochester Quadrajet, unique to the 301 Turbo, had super rich "DX" secondary metering rods and a remote vacuum source for the primary metering rod enrichment circuit; the "PEVR" or Power Enrichment Valve Regulator. Boost was wastegate limited to 9 psi (+/- 1 psi) although factory settings ranged from 7 on low to 10 psi on high.
The 301 Turbo package (RPO code LU8) mandated air conditioning (C51) due to the turbo-specific heater core box, and automatic transmission (TH350 (non-lockup) for 1980, and THM350C (lock-up) for 1981) and 3.08 positraction rear axle ratio (G80)."
The hardest part is finding the forged 301 pistons but they sometimes show up on Ebay once in a while. ( otherwise custom ones would have to be made)
Doug in P.R.
